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• Yum Update Failing mod_ssl and glibc_devel

  - by Kerry

  Any ideas on how to get this to not fail? # yum update Freeing read locks for locker 0x82: 4189/140342084876032 Freeing read locks for locker 0x84: 4189/140342084876032 Freeing read locks for locker 0x85: 4189/140342084876032 Freeing read locks for locker 0x86: 4189/140342084876032 Freeing read locks for locker 0x87: 4189/140342084876032 Freeing read locks for locker 0x9a: 4189/140342084876032 Freeing read locks for locker 0x9c: 4189/140342084876032 Freeing read locks for locker 0x9d: 4189/140342084876032 Freeing read locks for locker 0x9e: 4189/140342084876032 Freeing read locks for locker 0x9f: 4189/140342084876032 Freeing read locks for locker 0xa0: 4189/140342084876032 Freeing read locks for locker 0xa1: 4189/140342084876032 Freeing read locks for locker 0xa2: 4189/140342084876032 Freeing read locks for locker 0xa3: 4189/140342084876032 Freeing read locks for locker 0xa4: 4189/140342084876032 Freeing read locks for locker 0xa5: 4189/140342084876032 Freeing read locks for locker 0xa6: 4189/140342084876032 Freeing read locks for locker 0xa7: 4189/140342084876032 Freeing read locks for locker 0xa8: 4189/140342084876032 Freeing read locks for locker 0xa9: 4189/140342084876032 Freeing read locks for locker 0xaa: 4189/140342084876032 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.hmc.edu * epel: mirrors.kernel.org * extras: centos.mirror.freedomvoice.com * updates: mirrors.sonic.net Setting up Update Process Resolving Dependencies There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them. The program yum-complete-transaction is found in the yum-utils package. --> Running transaction check ---> Package device-mapper-persistent-data.x86_64 0:0.2.8-2.el6 will be updated ---> Package device-mapper-persistent-data.x86_64 0:0.2.8-4.el6_5 will be an update ---> Package glibc-headers.x86_64 0:2.12-1.132.el6 will be updated --> Processing Dependency: glibc-headers = 2.12-1.132.el6 for package: glibc-devel-2.12-1.132.el6.x86_64 ---> Package glibc-headers.x86_64 0:2.12-1.132.el6_5.2 will be an update ---> Package httpd.x86_64 0:2.2.15-29.el6.centos will be updated --> Processing Dependency: httpd = 2.2.15-29.el6.centos for package: 1:mod_ssl-2.2.15-29.el6.centos.x86_64 ---> Package httpd.x86_64 0:2.2.15-30.el6.centos will be an update ---> Package kernel.x86_64 0:2.6.32-431.17.1.el6 will be installed ---> Package kernel-devel.x86_64 0:2.6.32-431.17.1.el6 will be installed ---> Package selinux-policy-targeted.noarch 0:3.7.19-231.el6_5.1 will be updated ---> Package selinux-policy-targeted.noarch 0:3.7.19-231.el6_5.3 will be an update --> Finished Dependency Resolution Error: Package: 1:mod_ssl-2.2.15-29.el6.centos.x86_64 (@base) Requires: httpd = 2.2.15-29.el6.centos Removing: httpd-2.2.15-29.el6.centos.x86_64 (@base) httpd = 2.2.15-29.el6.centos Updated By: httpd-2.2.15-30.el6.centos.x86_64 (updates) httpd = 2.2.15-30.el6.centos Error: Package: glibc-devel-2.12-1.132.el6.x86_64 (@base) Requires: glibc-headers = 2.12-1.132.el6 Removing: glibc-headers-2.12-1.132.el6.x86_64 (@base) glibc-headers = 2.12-1.132.el6 Updated By: glibc-headers-2.12-1.132.el6_5.2.x86_64 (updates) glibc-headers = 2.12-1.132.el6_5.2 Available: glibc-headers-2.12-1.132.el6_5.1.x86_64 (updates) glibc-headers = 2.12-1.132.el6_5.1 You could try using --skip-broken to work around the problem ** Found 34 pre-existing rpmdb problem(s), 'yum check' output follows: audit-2.2-4.el6_5.x86_64 is a duplicate with audit-2.2-2.el6.x86_64 audit-libs-2.2-4.el6_5.x86_64 is a duplicate with audit-libs-2.2-2.el6.x86_64 curl-7.19.7-37.el6_5.3.x86_64 is a duplicate with curl-7.19.7-37.el6_4.x86_64 device-mapper-multipath-0.4.9-72.el6_5.2.x86_64 is a duplicate with device-mapper-multipath-0.4.9-72.el6_5.1.x86_64 device-mapper-multipath-libs-0.4.9-72.el6_5.2.x86_64 is a duplicate with device-mapper-multipath-libs-0.4.9-72.el6_5.1.x86_64 2:ethtool-3.5-1.4.el6_5.x86_64 is a duplicate with 2:ethtool-3.5-1.2.el6_5.x86_64 glibc-2.12-1.132.el6_5.2.x86_64 is a duplicate with glibc-2.12-1.132.el6.x86_64 glibc-common-2.12-1.132.el6_5.2.x86_64 is a duplicate with glibc-common-2.12-1.132.el6.x86_64 glibc-devel-2.12-1.132.el6_5.2.x86_64 is a duplicate with glibc-devel-2.12-1.132.el6.x86_64 glibc-devel-2.12-1.132.el6_5.2.x86_64 has missing requires of glibc-headers = ('0', '2.12', '1.132.el6_5.2') gnutls-2.8.5-14.el6_5.x86_64 is a duplicate with gnutls-2.8.5-13.el6_5.x86_64 httpd-2.2.15-29.el6.centos.x86_64 has missing requires of httpd-tools = ('0', '2.2.15', '29.el6.centos') httpd-manual-2.2.15-30.el6.centos.noarch has missing requires of httpd = ('0', '2.2.15', '30.el6.centos') iproute-2.6.32-32.el6_5.x86_64 is a duplicate with iproute-2.6.32-31.el6.x86_64 kernel-firmware-2.6.32-431.17.1.el6.noarch is a duplicate with kernel-firmware-2.6.32-431.11.2.el6.noarch kernel-headers-2.6.32-431.17.1.el6.x86_64 is a duplicate with kernel-headers-2.6.32-431.11.2.el6.x86_64 kpartx-0.4.9-72.el6_5.2.x86_64 is a duplicate with kpartx-0.4.9-72.el6_5.1.x86_64 krb5-libs-1.10.3-15.el6_5.1.x86_64 is a duplicate with krb5-libs-1.10.3-10.el6_4.6.x86_64 libblkid-2.17.2-12.14.el6_5.x86_64 is a duplicate with libblkid-2.17.2-12.14.el6.x86_64 libcurl-7.19.7-37.el6_5.3.x86_64 is a duplicate with libcurl-7.19.7-37.el6_4.x86_64 libcurl-devel-7.19.7-37.el6_5.3.x86_64 is a duplicate with libcurl-devel-7.19.7-37.el6_4.x86_64 libtasn1-2.3-6.el6_5.x86_64 is a duplicate with libtasn1-2.3-3.el6_2.1.x86_64 libuuid-2.17.2-12.14.el6_5.x86_64 is a duplicate with libuuid-2.17.2-12.14.el6.x86_64 libxml2-2.7.6-14.el6_5.1.x86_64 is a duplicate with libxml2-2.7.6-14.el6.x86_64 mdadm-3.2.6-7.el6_5.2.x86_64 is a duplicate with mdadm-3.2.6-7.el6.x86_64 1:mod_ssl-2.2.15-30.el6.centos.x86_64 is a duplicate with 1:mod_ssl-2.2.15-29.el6.centos.x86_64 1:mod_ssl-2.2.15-30.el6.centos.x86_64 has missing requires of httpd = ('0', '2.2.15', '30.el6.centos') nss-softokn-3.14.3-10.el6_5.x86_64 is a duplicate with nss-softokn-3.14.3-9.el6.x86_64 openssl-1.0.1e-16.el6_5.7.x86_64 is a duplicate with openssl-1.0.1e-16.el6_5.4.x86_64 openssl-1.0.1e-16.el6_5.14.x86_64 is a duplicate with openssl-1.0.1e-16.el6_5.7.x86_64 openssl-devel-1.0.1e-16.el6_5.14.x86_64 is a duplicate with openssl-devel-1.0.1e-16.el6_5.7.x86_64 selinux-policy-3.7.19-231.el6_5.3.noarch is a duplicate with selinux-policy-3.7.19-231.el6_5.1.noarch tzdata-2014d-1.el6.noarch is a duplicate with tzdata-2014b-1.el6.noarch util-linux-ng-2.17.2-12.14.el6_5.x86_64 is a duplicate with util-linux-ng-2.17.2-12.14.el6.x86_64 UPDATE I installed and ran yum-complete-transaction as requested, it finished some things and suggested I run package-cleanup --problems, which yielded this: package-cleanup --problems Loaded plugins: fastestmirror Package httpd-manual-2.2.15-30.el6.centos.noarch requires httpd = ('0', '2.2.15', '30.el6.centos') Package httpd-2.2.15-29.el6.centos.x86_64 requires httpd-tools = ('0', '2.2.15', '29.el6.centos') Package mod_ssl-2.2.15-30.el6.centos.x86_64 requires httpd = ('0', '2.2.15', '30.el6.centos') Package glibc-devel-2.12-1.132.el6_5.2.x86_64 requires glibc-headers = ('0', '2.12', '1.132.el6_5.2') I'm definitely not a sys-admin, what would be the next step? UPDATE 2 I ran yum distro-sync: # yum distro-sync Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.hmc.edu * epel: mirrors.kernel.org * extras: centos.mirror.freedomvoice.com * updates: mirrors.sonic.net Setting up Distribution Synchronization Process Resolving Dependencies --> Running transaction check ---> Package glibc-headers.x86_64 0:2.12-1.132.el6 will be updated --> Processing Dependency: glibc-headers = 2.12-1.132.el6 for package: glibc-devel-2.12-1.132.el6.x86_64 ---> Package glibc-headers.x86_64 0:2.12-1.132.el6_5.2 will be an update ---> Package httpd.x86_64 0:2.2.15-29.el6.centos will be updated --> Processing Dependency: httpd = 2.2.15-29.el6.centos for package: 1:mod_ssl-2.2.15-29.el6.centos.x86_64 ---> Package httpd.x86_64 0:2.2.15-30.el6.centos will be an update --> Finished Dependency Resolution Error: Package: 1:mod_ssl-2.2.15-29.el6.centos.x86_64 (@base) Requires: httpd = 2.2.15-29.el6.centos Removing: httpd-2.2.15-29.el6.centos.x86_64 (@base) httpd = 2.2.15-29.el6.centos Updated By: httpd-2.2.15-30.el6.centos.x86_64 (updates) httpd = 2.2.15-30.el6.centos Error: Package: glibc-devel-2.12-1.132.el6.x86_64 (@base) Requires: glibc-headers = 2.12-1.132.el6 Removing: glibc-headers-2.12-1.132.el6.x86_64 (@base) glibc-headers = 2.12-1.132.el6 Updated By: glibc-headers-2.12-1.132.el6_5.2.x86_64 (updates) glibc-headers = 2.12-1.132.el6_5.2 Available: glibc-headers-2.12-1.132.el6_5.1.x86_64 (updates) glibc-headers = 2.12-1.132.el6_5.1 You could try using --skip-broken to work around the problem ** Found 34 pre-existing rpmdb problem(s), 'yum check' output follows: audit-2.2-4.el6_5.x86_64 is a duplicate with audit-2.2-2.el6.x86_64 audit-libs-2.2-4.el6_5.x86_64 is a duplicate with audit-libs-2.2-2.el6.x86_64 curl-7.19.7-37.el6_5.3.x86_64 is a duplicate with curl-7.19.7-37.el6_4.x86_64 device-mapper-multipath-0.4.9-72.el6_5.2.x86_64 is a duplicate with device-mapper-multipath-0.4.9-72.el6_5.1.x86_64 device-mapper-multipath-libs-0.4.9-72.el6_5.2.x86_64 is a duplicate with device-mapper-multipath-libs-0.4.9-72.el6_5.1.x86_64 2:ethtool-3.5-1.4.el6_5.x86_64 is a duplicate with 2:ethtool-3.5-1.2.el6_5.x86_64 glibc-2.12-1.132.el6_5.2.x86_64 is a duplicate with glibc-2.12-1.132.el6.x86_64 glibc-common-2.12-1.132.el6_5.2.x86_64 is a duplicate with glibc-common-2.12-1.132.el6.x86_64 glibc-devel-2.12-1.132.el6_5.2.x86_64 is a duplicate with glibc-devel-2.12-1.132.el6.x86_64 glibc-devel-2.12-1.132.el6_5.2.x86_64 has missing requires of glibc-headers = ('0', '2.12', '1.132.el6_5.2') gnutls-2.8.5-14.el6_5.x86_64 is a duplicate with gnutls-2.8.5-13.el6_5.x86_64 httpd-2.2.15-29.el6.centos.x86_64 has missing requires of httpd-tools = ('0', '2.2.15', '29.el6.centos') httpd-manual-2.2.15-30.el6.centos.noarch has missing requires of httpd = ('0', '2.2.15', '30.el6.centos') iproute-2.6.32-32.el6_5.x86_64 is a duplicate with iproute-2.6.32-31.el6.x86_64 kernel-firmware-2.6.32-431.17.1.el6.noarch is a duplicate with kernel-firmware-2.6.32-431.11.2.el6.noarch kernel-headers-2.6.32-431.17.1.el6.x86_64 is a duplicate with kernel-headers-2.6.32-431.11.2.el6.x86_64 kpartx-0.4.9-72.el6_5.2.x86_64 is a duplicate with kpartx-0.4.9-72.el6_5.1.x86_64 krb5-libs-1.10.3-15.el6_5.1.x86_64 is a duplicate with krb5-libs-1.10.3-10.el6_4.6.x86_64 libblkid-2.17.2-12.14.el6_5.x86_64 is a duplicate with libblkid-2.17.2-12.14.el6.x86_64 libcurl-7.19.7-37.el6_5.3.x86_64 is a duplicate with libcurl-7.19.7-37.el6_4.x86_64 libcurl-devel-7.19.7-37.el6_5.3.x86_64 is a duplicate with libcurl-devel-7.19.7-37.el6_4.x86_64 libtasn1-2.3-6.el6_5.x86_64 is a duplicate with libtasn1-2.3-3.el6_2.1.x86_64 libuuid-2.17.2-12.14.el6_5.x86_64 is a duplicate with libuuid-2.17.2-12.14.el6.x86_64 libxml2-2.7.6-14.el6_5.1.x86_64 is a duplicate with libxml2-2.7.6-14.el6.x86_64 mdadm-3.2.6-7.el6_5.2.x86_64 is a duplicate with mdadm-3.2.6-7.el6.x86_64 1:mod_ssl-2.2.15-30.el6.centos.x86_64 is a duplicate with 1:mod_ssl-2.2.15-29.el6.centos.x86_64 1:mod_ssl-2.2.15-30.el6.centos.x86_64 has missing requires of httpd = ('0', '2.2.15', '30.el6.centos') nss-softokn-3.14.3-10.el6_5.x86_64 is a duplicate with nss-softokn-3.14.3-9.el6.x86_64 openssl-1.0.1e-16.el6_5.7.x86_64 is a duplicate with openssl-1.0.1e-16.el6_5.4.x86_64 openssl-1.0.1e-16.el6_5.14.x86_64 is a duplicate with openssl-1.0.1e-16.el6_5.7.x86_64 openssl-devel-1.0.1e-16.el6_5.14.x86_64 is a duplicate with openssl-devel-1.0.1e-16.el6_5.7.x86_64 selinux-policy-3.7.19-231.el6_5.3.noarch is a duplicate with selinux-policy-3.7.19-231.el6_5.1.noarch tzdata-2014d-1.el6.noarch is a duplicate with tzdata-2014b-1.el6.noarch util-linux-ng-2.17.2-12.14.el6_5.x86_64 is a duplicate with util-linux-ng-2.17.2-12.14.el6.x86_64

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• raid md device is not remove from memory, how to overcome this problem

  - by santhosha

  i create raid 10 , i removed two arrays form md11 one by one , after that i going to editing the contents those are mounted ( it will be not responding stage), after i try for remove arrays those are left it is shows device or resource busy ( is not removed from memory). i try to terminate process this is also not work, i absorve from 4 days resync will be 8.0% it can not modifying. cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] md11 : active raid10 sde1[3] sdj14 286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0] [=...................] resync = 8.0% (23210368/286743936) finish=289392.6min speed=15K/sec mdadm -D /dev/md11 /dev/md11: Version : 00.90.03 Creation Time : Sun Jan 16 16:20:01 2011 Raid Level : raid10 Array Size : 286743936 (273.46 GiB 293.63 GB) Device Size : 143371968 (136.73 GiB 146.81 GB) Raid Devices : 4 Total Devices : 2 Preferred Minor : 11 Persistence : Superblock is persistent Update Time : Sun Jan 16 16:56:07 2011 State : active, degraded, resyncing Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Layout : near=2, far=1 Chunk Size : 64K Rebuild Status : 8% complete UUID : 5e124ea4:79a01181:dc4110d3:a48576ea Events : 0.23 Number Major Minor RaidDevice State 0 0 0 0 removed 1 0 0 1 removed 4 8 145 2 faulty spare rebuilding /dev/sdj1 3 8 65 3 active sync /dev/sde1 umount /dev/md11 umount: /dev/md11: not mounted mdadm -S /dev/md11 mdadm: fail to stop array /dev/md11: Device or resource busy lsof /dev/md11 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mount 2128 root 3r BLK 9,11 4058 /dev/md11 mount 5018 root 3r BLK 9,11 4058 /dev/md11 mdadm 27605 root 3r BLK 9,11 4058 /dev/md11 mount 30562 root 3r BLK 9,11 4058 /dev/md11 badblocks 30591 root 3r BLK 9,11 4058 /dev/md11 kill -9 2128 kill -9 5018 kill -9 27605 kill -9 30562 kill -3 30591 mdadm -S /dev/md11 mdadm: fail to stop array /dev/md11: Device or resource busy lsof /dev/md11 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mount 2128 root 3r BLK 9,11 4058 /dev/md11 mount 5018 root 3r BLK 9,11 4058 /dev/md11 mdadm 27605 root 3r BLK 9,11 4058 /dev/md11 mount 30562 root 3r BLK 9,11 4058 /dev/md11 badblocks 30591 root 3r BLK 9,11 4058 /dev/md11 cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] md11 : active raid10 sde1[3] sdj14 286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0] [=...................] resync = 8.0% (23210368/286743936) finish=289392.6min speed=15K/sec

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• How to permanently "renice" a process on Mac OS X (or iOS, etc)?

  - by mralexgray

  I use a nice (free) process manager called ATMonitor for Mac OS X that has a lot of cool hidden features... one of which is being able to click on a running process.. and set the "renice" from +20 (less priority) to -20 (highest priority). The best part.... it sticks between restarts... SO you want XYZ to get full attention all the time.. you set it once and it's done... I want to do the same thing (renice a process) on an iPad running a particular daemon.. and I don't know how to set a renice permanently. I can do it once, and it works fine... But the setting is lost on a reboot. I read somewhere.. Now, as for permanently resetting the priority of a process, this can't be done directly. You can fake it, however, with a shell script that starts the app and then immediately renice's it. Give that script a ".command" extension and it will be double-clickable in the GUI. Not very elegant, but it gets the job done. But as it says.. not very elegant, and I dont think this is how ATMonitor does it.... I found this thread.... http://superuser.com and they gave a way to do it as a launch argument, but no apparent way to save it as a persistent value... for instance - if the program wasn't going to be started by launchd... How do I set a permanent renice level, per executable binary, independent of it's PID, when, how or why it was launched?

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• best practice to removing DC from Site that no longer connects via vpn in another city

  - by dasko

  hi i am looking for a recap of what i have done already to see if i missed anything. i had two cities connected by wan using a ipsec persistent tunnel between gateways. i had one DC (DOMAIN CONTROLLER) in each city that was a global catalog server (GC) they were set up to replicate and i had them configured under Sites and Servers with their own subnet etc... about 6 months ago the one city was removed and i was not able to gracefully remove, through dcpromo, the server that was there. it is no longer used and cannot be brought back. the company went from two sites down to single site. Problem is i had a whole bunch of kcc errors and replication bugs in the event viewer. i wanted to clean up my active directory and decided to use the ntdsutil metadata cleanup commands. i removed the server from the specifed site based on a procedure from petri website. I then removed the instances of the old DC and site from Sites and Servers. Then i went and cleaned up the DNS by removing Host A records, NS server name from both the local DNS forward lookup zone and the _msdcs i also removed the reverse lookup zone for the subnet that no longer exists. is there anything i missed? thanks in advance for any help. gd

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• ipvsadm lists a few hosts by IP only, rest by name

  - by dmourati

  We use keepalived to manage our Linux Virtual Server (LVS) load balancer. The LVS VIPs are setup to use a FWMARK as configured in iptables. virtual_server fwmark 300000 { delay_loop 10 lb_algo wrr lb_kind NAT persistence_timeout 180 protocol TCP real_server 10.10.35.31 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.31" misc_timeout 30 } } real_server 10.10.35.32 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.32" misc_timeout 30 } } real_server 10.10.35.33 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.33" misc_timeout 30 } } real_server 10.10.35.34 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.34" misc_timeout 30 } } } http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.fwmark.html [root@lb1 ~]# iptables -L -n -v -t mangle Chain PREROUTING (policy ACCEPT 182G packets, 114T bytes) 190M 167G MARK tcp -- * * 0.0.0.0/0 w1.x1.y1.4 multiport dports 80,443 MARK set 0x493e0 62M 58G MARK tcp -- * * 0.0.0.0/0 w1.x1.y2.4 multiport dports 80,443 MARK set 0x493e0 [root@lb1 ~]# ipvsadm -L IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn FWM 300000 wrr persistent 180 -> 10.10.35.31:0 Masq 24 1 0 -> dis2.domain.com:0 Masq 24 3 231 -> 10.10.35.33:0 Masq 24 0 208 -> 10.10.35.34:0 Masq 24 0 0 At the time the realservers were setup, there was a misconfigured dns for some hosts in the 10.10.35.0/24 network. Thereafter, we fixed the DNS. However, the hosts continue to show up as only their IP numbers (10.10.35.31,10.10.35.33,10.10.35.34) above. [root@lb1 ~]# host 10.10.35.31 31.35.10.10.in-addr.arpa domain name pointer dis1.domain.com. OS is CentOS 6.3. Ipvsadm is ipvsadm-1.25-10.el6.x86_64. kernel is kernel-2.6.32-71.el6.x86_64. Keepalived is keepalived-1.2.7-1.el6.x86_64. How can we get ipvsadm -L to list all realservers by their proper hostnames?

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• How to automatically remove Flash history/privacy trail? Or stop Flash from storing it?

  - by Arjan van Bentem

  Many people have heard about third-party cookies, and some browsers even block those by default. Some people may even be using Private Browsing modes. However, only few seem to realise that Adobe's Flash player also leaves a cross-browser trail on your local hard drive, and allows for sending cookie-like information back to the server, including third-party sites. And because it is a plugin, Flash does not take any of the browser's privacy settings into account. Sorry for the long post, but first some details about why using Flash raises a privacy concern, followed by the results of my tests: The Flash player keeps a cross-browser history of the domain names of the Flash-sites your computer has visited. Unlike your browser's history, this history is not limited to a certain number of days. History is also recorded while using so-called Private Browsing modes. It is stored on your hard drive (though, as described below, without going to Adobe's site you won't know what is stored). I am not sure if any date and time information is kept about each visit, but to see the domain names: right-click on some Flash content, open the settings dialog, and click the Help icon or click the Advanced button within the Privacy tab. This opens a browser to the help pages on Adobe.com, where one can click through to the Website Storage Settings panel. One can clear the existing list, but one cannot stop it from being recorded again. Flash allows for storing data on your local hard drive, using so-called Local Shared Objects (aka "Flash Cookies"). Just like HTTP cookies, this data can be sent back to the server, for tracking purposes. They are cross-browser, have no expiration date, and no user defined maximum lifetime can be set in the Flash preferences either. These not being HTTP cookies, they are (of course) not blocked by a browser's cookies preferences and are not removed when the normal HTTP cookies are deleted. Adobe has announced that version 10.1 will obey Private Browsing in most popular browsers, but unfortunately no word about also removing the data whenever normal cookies are deleted manually. And its implementation might be confusing: [..] if the browser is in normal browsing mode when the Flash Player instance is created, then that particular instance will forever be in normal browsing mode (private browsing is turned off). Accordingly, toggling private browsing on or off without refreshing the page or closing the private browsing window will not impact Flash Player. Local Shared Objects are not limited to the site you visit, and third-party storage is enabled by default. At the Global Storage Settings panel one can deselect the default Allow third-party Flash content to store data on your computer. Because of the cross-browser and expiration-less nature (and the fact that few people know about it), I feel that the cross-browser third-party Flash Cookies are more dangerous for visitor tracking than third-party normal HTTP cookies. They are even used to restore plain HTTP cookies that the user tried to delete: "All advertisers, websites and networks use cookies for targeted advertising, but cookies are under attack. According to current research they are being erased by 40% of users creating serious problems," says Mookie Tenembaum, founder of United Virtualities. "From simple frequency capping to the more sophisticated behavioral targeting, cookies are an essential part of any online ad campaign. PIE ["Persistent Identification Element"] will give publishers and third-party providers a persistent backup to cookies effectively rendering them unassailable", adds Tenembaum. [..] To justify this tracking mechanism, UV's Tenembaum said, "The user is not proficient enough in technology to know if the cookie is good or bad, or how it works." When selecting None (zero KB) for Specify the amount of disk space that website websites that you haven't yet visited can use to store information on your computer, and checking Never ask again then some sites do not work. However, the same site might work when setting it to None but without selecting Never ask again, and then choose Deny whenever prompted. Both options would result in zero KB of data being allowed, but the behaviour differs. The plugin also provides a Flash Player cache for Adobe-signed files. I guess these files are not an issue. So: how to automatically delete that information? On a Mac, one can find a settings.sol file and a folder for each visited Flash-website in: $HOME/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys/ Deleting the settings.sol file and all the folders in sys, removes the trail from the settings panels. However, the actual Local Shared Ojects are elsewhere (see Wikipedia for locations on other operating systems), in a randomly named subfolder of: $HOME/Library/Preferences/Macromedia/Flash Player/#SharedObjects But then: how to remove this automatically? Simply removing the folders and the settings.sol file every now and then (like by using launchd or Windows' Task Scheduler) may interfere with active browsers. Or is it safe to assume that, given the cross-browser nature, the plugin would not care if things are removed while it is active? Only clearing during log-off may not work for those who hibernate all the time. Firefox users can install BetterPrivacy or Objection to delete the Local Shared Objects (for all others browsers as well). I don't know if that also deletes the trail of website domain names. Or: how to stop Flash from storing a history trail? Change of plans: I'm currently testing prohibiting Flash to write to its own sys and #SharedObjects folders. So far, Flash has not tried to restore permissions (though, when deleting the folders, Flash will of course recreate them). I've not encountered any problems but this may take some while to validate, using multiple browsers and sites. I've not yet found a log that reports errors. On a Mac: cd "$HOME/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer" rm -r sys/* chmod u-w sys cd "$HOME/Library/Preferences/Macromedia/Flash Player" # preserve the randomly named subfolders (only preserving the latest would suffice; see below) rm -r \#SharedObjects/*/* chmod -R u-w \#SharedObjects I guess the above chmods cannot be achieved on an old Windows system (I'm not sure about XP and Vista?). Though maybe on Windows one could replace the folders sys and #SharedObjects with dummy files with the same names? Anyone? Obviously, keeping Flash from storing those Local Shared Objects for all sites may cause problems. Some test results (Flash 10 on Mac OS X): When blocking the sys folder (even when leaving the #SharedObjects folder writable) then YouTube won't remember your volume settings while viewing multiple videos. Temporarily allowing write access to the blocked folders while visiting trusted sites (to only create folders for domains you like, maybe including references in settings.sol) solves that. This way, for YouTube, Flash could be allowed to write to sys/#s.ytimg.com and #SharedObjects/s.ytimg.com, while Flash could not create new folders for other domains. One may also need to make settings.sol read-only afterwards, or delete it again. When blocking both the sys and #SharedObjects folders, YouTube and Vimeo work fine (though they might not remember any settings). However, Bits on the Run refuses to even show the video player. This is solved by temporarily unblocking the #SharedObjects folder, to allow Flash to create a subfolder with some random name. Within this folder, it would create yet another folder for the current Flash website (content.bitsontherun.com). Removing that website-specific folder, and blocking both #SharedObjects and the randomly named subfolder, still seems to allow Bits on the Run to operate, even though it still cannot write anything to disk. So: the existence of the randomly named subfolder (even when write protected) is important for some sites. When I first found the #SharedObjects folder, it held many subfolders with random names, some created on the very same day. I wonder when Flash decides it wants a new folder, and how it determines (and remembers) that random name. For a moment I considered not blocking write access for sys and #SharedObjects, but explicitly creating read-only folders for well-known third-party tracking domains (like based on a list from, for example, AdBlock Plus). That way, any other domain could still create Local Shared Objects. But the list would be long, and the domains from AdBlock Plus are probably all third-party domains anyway, so disabling Allow third-party Flash content to store data on your computer might have the very same result. Any experience anyone? (Final notes: if the above links to the settings panels do not work in the future, then use the URL that is known to Flash player as a starting point: www.adobe.com/go/settingsmanager. See also "You Deleted Your Cookies? Think Again" at Wired.com -- which uses Flash cookies itself as well... For the very suspicious using Time Machine: you may want to exclude both folders, for each user, and remove the trace that is already on your backup.)

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• Finding all IP ranges blelonging to a specific ISP

  - by Jim Jim

  I'm having an issue with a certain individual who keeps scraping my site in an aggressive manner; wasting bandwidth and CPU resources. I've already implemented a system which tails my web server access logs, adds each new IP to a database, keeps track of the number of requests made from that IP, and then, if the same IP goes over a certain threshold of requests within a certain time period, it's blocked via iptables. It may sound elaborate, but as far as I know, there exists no pre-made solution designed to limit a certain IP to a certain amount of bandwidth/requests. This works fine for most crawlers, but an extremely persistent individual is getting a new IP from his/her ISP pool each time they're blocked. I would like to block the ISP entirely, but don't know how to go about it. Doing a whois on a few sample IPs, I can see that they all share the same "netname", "mnt-by", and "origin/AS". Is there a way I can query the ARIN/RIPE database for all subnets using the same mnt-by/AS/netname? If not, how else could I go about getting every IP belonging to this ISP? Thanks.

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• solaris zpool SSD cache device "faulted"

  - by John-ZFS

  I am trying to get over these SATA SSD errors - smartctl command failed to read the SATA SSD - SATA is not supported what could be the reason for errors? does this mean that SSD has reached EOL & needs to be replacement? errors: No known data errors pool: zpool1216 state: DEGRADED status: One or more devices are faulted in response to persistent errors. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Replace the faulted device, or use 'zpool clear' to mark the device repaired. scan: scrub repaired 0 in 0h24m with 0 errors on Fri May 18 14:31:08 2012 config: NAME STATE READ WRITE CKSUM zpool1216 DEGRADED 0 0 0 raidz1-0 ONLINE 0 0 0 c11t10d0 ONLINE 0 0 0 c11t11d0 ONLINE 0 0 0 c11t12d0 ONLINE 0 0 0 c11t13d0 ONLINE 0 0 0 c11t14d0 ONLINE 0 0 0 c11t15d0 ONLINE 0 0 0 c11t16d0 ONLINE 0 0 0 c11t1d0 ONLINE 0 0 0 c11t2d0 ONLINE 0 0 0 c11t3d0 ONLINE 0 0 0 c11t4d0 ONLINE 0 0 0 c11t5d0 ONLINE 0 0 0 c11t6d0 ONLINE 0 0 0 c11t7d0 ONLINE 0 0 0 c11t8d0 ONLINE 0 0 0 c11t9d0 ONLINE 0 0 0 logs c9d0 FAULTED 0 0 0 too many errors cache c10d0 FAULTED 0 17 0 too many errors

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• Puppet: array in parameterized classes VS using resources

  - by Luke404

  I have some use cases where I want to define multiple similar resources that should end up in a single file (via a template). As an example I'm trying to write a puppet module that will let me manage the mapping between MAC addresses and network interface names (writing udev's persistent-net-rules file from puppet), but there are also many other similar usage cases. I searched around and found that it could be done with the new parameterised classes syntax: if implemented that way it should end up being used like this: node { "myserver.example.com": class { "network::iftab": interfaces => { "eth0" => { "mac" => "ab:cd:ef:98:76:54" } "eth1" => { "mac" => "98:76:de:ad:be:ef" } } } } Not too bad, I agree, but it would rapidly explode when you manage more complex stuff (think network configurations like in this module or any other multiple-complex-resources-in-a-single-config-file stuff). In a similar question on SF someone suggested using Pienaar's puppet-concat module but I doubt it could get any better than parameterised classes. What would be really cool and clean in the configuration definition would be something like the included host type, it's usage is simple, pretty and clean and naturally maps to multiple resources that will end up being configured in a single place. Transposed to my example it would be like: node { "myserver.example.com": interface { "eth0": "mac" => "ab:cd:ef:98:76:54", "foo" => "bar", "asd" => "lol", "eth1": "mac" => "98:76:de:ad:be:ef", "foo" => "rab", "asd" => "olo", } } ...that looks much better to my eyes, even with 3x options to each resource. Should I really be passing arrays to parameterised classes, or there is a better way to do this kind of stuff? Is there some accepted consensus in the puppet [users|developers] community? By the way, I'm referring to the latest stable release of the 2.7 branch and I am not interested in compatibility with older versions.

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• Redmine install not working and displaying directory contents - Ubuntu 10.04

  - by Casey Flynn

  I've gone through the steps to set up and install the redmine project tracking web app on my VPS with Apache2 but I'm running into a situation where instead of displaying the redmine app, I just see the directory contents: Does anyone know what could be the problem? I'm not sure what other files might be of use to diagnose what's going on. Thanks! # # Based upon the NCSA server configuration files originally by Rob McCool. # # This is the main Apache server configuration file. It contains the # configuration directives that give the server its instructions. # See http://httpd.apache.org/docs/2.2/ for detailed information about # the directives. # # Do NOT simply read the instructions in here without understanding # what they do. They're here only as hints or reminders. If you are unsure # consult the online docs. You have been warned. # # The configuration directives are grouped into three basic sections: # 1. Directives that control the operation of the Apache server process as a # whole (the 'global environment'). # 2. Directives that define the parameters of the 'main' or 'default' server, # which responds to requests that aren't handled by a virtual host. # These directives also provide default values for the settings # of all virtual hosts. # 3. Settings for virtual hosts, which allow Web requests to be sent to # different IP addresses or hostnames and have them handled by the # same Apache server process. # # Configuration and logfile names: If the filenames you specify for many # of the server's control files begin with "/" (or "drive:/" for Win32), the # server will use that explicit path. If the filenames do *not* begin # with "/", the value of ServerRoot is prepended -- so "/var/log/apache2/foo.log" # with ServerRoot set to "" will be interpreted by the # server as "//var/log/apache2/foo.log". # ### Section 1: Global Environment # # The directives in this section affect the overall operation of Apache, # such as the number of concurrent requests it can handle or where it # can find its configuration files. # # # ServerRoot: The top of the directory tree under which the server's # configuration, error, and log files are kept. # # NOTE! If you intend to place this on an NFS (or otherwise network) # mounted filesystem then please read the LockFile documentation (available # at <URL:http://httpd.apache.org/docs-2.1/mod/mpm_common.html#lockfile>); # you will save yourself a lot of trouble. # # Do NOT add a slash at the end of the directory path. # ServerRoot "/etc/apache2" # # The accept serialization lock file MUST BE STORED ON A LOCAL DISK. # #<IfModule !mpm_winnt.c> #<IfModule !mpm_netware.c> LockFile /var/lock/apache2/accept.lock #</IfModule> #</IfModule> # # PidFile: The file in which the server should record its process # identification number when it starts. # This needs to be set in /etc/apache2/envvars # PidFile ${APACHE_PID_FILE} # # Timeout: The number of seconds before receives and sends time out. # Timeout 300 # # KeepAlive: Whether or not to allow persistent connections (more than # one request per connection). Set to "Off" to deactivate. # KeepAlive On # # MaxKeepAliveRequests: The maximum number of requests to allow # during a persistent connection. Set to 0 to allow an unlimited amount. # We recommend you leave this number high, for maximum performance. # MaxKeepAliveRequests 100 # # KeepAliveTimeout: Number of seconds to wait for the next request from the # same client on the same connection. # KeepAliveTimeout 15 ## ## Server-Pool Size Regulation (MPM specific) ## # prefork MPM # StartServers: number of server processes to start # MinSpareServers: minimum number of server processes which are kept spare # MaxSpareServers: maximum number of server processes which are kept spare # MaxClients: maximum number of server processes allowed to start # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # worker MPM # StartServers: initial number of server processes to start # MaxClients: maximum number of simultaneous client connections # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadsPerChild: constant number of worker threads in each server process # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # event MPM # StartServers: initial number of server processes to start # MaxClients: maximum number of simultaneous client connections # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadsPerChild: constant number of worker threads in each server process # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> # These need to be set in /etc/apache2/envvars User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} # # AccessFileName: The name of the file to look for in each directory # for additional configuration directives. See also the AllowOverride # directive. # AccessFileName .htaccess # # The following lines prevent .htaccess and .htpasswd files from being # viewed by Web clients. # <Files ~ "^\.ht"> Order allow,deny Deny from all Satisfy all </Files> # # DefaultType is the default MIME type the server will use for a document # if it cannot otherwise determine one, such as from filename extensions. # If your server contains mostly text or HTML documents, "text/plain" is # a good value. If most of your content is binary, such as applications # or images, you may want to use "application/octet-stream" instead to # keep browsers from trying to display binary files as though they are # text. # DefaultType text/plain # # HostnameLookups: Log the names of clients or just their IP addresses # e.g., www.apache.org (on) or 204.62.129.132 (off). # The default is off because it'd be overall better for the net if people # had to knowingly turn this feature on, since enabling it means that # each client request will result in AT LEAST one lookup request to the # nameserver. # HostnameLookups Off # ErrorLog: The location of the error log file. # If you do not specify an ErrorLog directive within a <VirtualHost> # container, error messages relating to that virtual host will be # logged here. If you *do* define an error logfile for a <VirtualHost> # container, that host's errors will be logged there and not here. # ErrorLog /var/log/apache2/error.log # # LogLevel: Control the number of messages logged to the error_log. # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. # LogLevel warn # Include module configuration: Include /etc/apache2/mods-enabled/*.load Include /etc/apache2/mods-enabled/*.conf # Include all the user configurations: Include /etc/apache2/httpd.conf # Include ports listing Include /etc/apache2/ports.conf # # The following directives define some format nicknames for use with # a CustomLog directive (see below). # If you are behind a reverse proxy, you might want to change %h into %{X-Forwarded-For}i # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent # # Define an access log for VirtualHosts that don't define their own logfile CustomLog /var/log/apache2/other_vhosts_access.log vhost_combined # Include of directories ignores editors' and dpkg's backup files, # see README.Debian for details. # Include generic snippets of statements Include /etc/apache2/conf.d/ # Include the virtual host configurations: Include /etc/apache2/sites-enabled/ # Enable fastcgi for .fcgi files # (If you're using a distro package for mod_fcgi, something like # this is probably already present) #<IfModule mod_fcgid.c> # AddHandler fastcgi-script .fcgi # FastCgiIpcDir /var/lib/apache2/fastcgi #</IfModule> LoadModule fcgid_module /usr/lib/apache2/modules/mod_fcgid.so LoadModule passenger_module /var/lib/gems/1.8/gems/passenger-3.0.7/ext/apache2/mod_passenger.so PassengerRoot /var/lib/gems/1.8/gems/passenger-3.0.7 PassengerRuby /usr/bin/ruby1.8 ServerName demo and my vhosts file #No DNS server, default ip address v-host #domain: none #public: /home/casey/public_html/app/ <VirtualHost *:80> ServerAdmin webmaster@localhost # ScriptAlias /redmine /home/casey/public_html/app/redmine/dispatch.fcgi DirectoryIndex index.html DocumentRoot /home/casey/public_html/app/public <Directory "/home/casey/trac/htdocs"> Order allow,deny Allow from all </Directory> <Directory /var/www/redmine> RailsBaseURI /redmine PassengerResolveSymlinksInDocumentRoot on </Directory> # <Directory /> # Options FollowSymLinks # AllowOverride None # </Directory> # <Directory /var/www/> # Options Indexes FollowSymLinks MultiViews # AllowOverride None # Order allow,deny # allow from all # </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /home/casey/public_html/app/log/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel debug CustomLog /home/casey/public_html/app/log/access.log combined # Alias /doc/ "/usr/share/doc/" # <Directory "/usr/share/doc/"> # Options Indexes MultiViews FollowSymLinks # AllowOverride None # Order deny,allow # Deny from all # Allow from 127.0.0.0/255.0.0.0 ::1/128 # </Directory> </VirtualHost>

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• Windows xp mapped drives disconnect from Windows 7 on Peer to Peer network

  - by Kathryn Codo

  I have a 5 user peer to peer network. 2-XP machines, 3- Windows 7 machines and a Windows 7 machine acting as the file server. I have NO issues with the Windows 7 machines staying connected via the mapped drives to the "server". However, once a day the 2 XP machines will not connect to the Windows 7 machine "server" via the mapped drives. I must restart the "server" in order to see the server and access the files via the mapped drives or Explorer. I have tried the persistent : yes command in NET USE, on the XP machines and also setting a static IP address on the "server". I've turned the firewall off on the "server:, no difference so I turned the firewall back on. No interruption occurs with the internet when this happens, just can't see the server. Again, the Windows 7 users are unaffected. I have gone into the advanced network settings on the "server" and added read/write permissions for Everyone as well as the users of the XP machines. I have double checked that we are all on the same WORKGROUP. I'm at a loss. It seems to happen around mid-day and I've not been able to find any activity that is happening at this time (Like someone plugging in a thumbdrive). Any suggestions would be greatly appreciated as my client is running old XP software he no longer has the disks for and needs for his engineering firm.

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• Configuring apache and php to handle many connections

  - by Marc

  My preliminary setup is like this. Two QuadCore 8GB servers running debian 6, with php and apache, One QuadCore 16GB server running debian 6, with mysql My plan is to have one 8Gb server to act as a proxy server, using vertx java to handle connections. I will let vertx use HttpClient to send web requests to the second 8GB server. This would have apache installed and use php to deliver any information that it gets from the mysql server on the third, 16GB server. The main reason I want this setup is to have things separated, so the "proxy" will be the only way to access the system, as the other two server will only be reachable from the local network. I can have the vertx proxy handle 5000+ concurrent connections, but, I don't know how to configure apache to handle all the requests coming from the proxy. Php will connect over mysqli with persistent connection pool of 500-800 connections, the mysql server seems not to have any issues on this part. In previous projects, the apache part was always causing issues, no matter how I set it up. I might not fully understand how to setup apache, since normally apache should handle many concurrent connections, but it does seem to now.

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• Cannot access host from a virtualbox guest using bridged adapter

  - by David Dai

  I have a windows 7 host with firewall turned off. And I have a windowsXP guest running on Virtualbox 4.2.4r81684. In my windowsXP guest I tried to connect to the FTP server on my host machine(which used to work well) but it didn't work. I tried to ping my host machine, but it didn't work either. Then I tried to ping my guest from host, it worked well. my guest ip is :192.168.1.95 my host ip is : 192.168.1.9 route table on guest machine is this: C:\Documents and Settings\wenlong>route PRINT =========================================================================== Interface List 0x1 ........................... MS TCP Loopback interface 0x2 ...08 00 27 66 54 6c ...... AMD PCNET Family PCI Ethernet Adapter #2 - Packe t Scheduler Miniport =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.95 20 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 192.168.1.0 255.255.255.0 192.168.1.95 192.168.1.95 20 192.168.1.95 255.255.255.255 127.0.0.1 127.0.0.1 20 192.168.1.255 255.255.255.255 192.168.1.95 192.168.1.95 20 224.0.0.0 240.0.0.0 192.168.1.95 192.168.1.95 20 255.255.255.255 255.255.255.255 192.168.1.95 192.168.1.95 1 Default Gateway: 192.168.1.1 =========================================================================== Persistent Routes: None arp cache is this: C:\Documents and Settings\wenlong>arp -a Interface: 192.168.1.95 --- 0x2 Internet Address Physical Address Type 192.168.1.1 00-26-f2-60-3c-04 dynamic 192.168.1.9 90-e6-ba-c2-90-2f dynamic It's strange because there was no problem days before and I didn't make any changes to the setting. could anybody help? PS. the guest can communicate with other machines in the LAN(for example 192.168.1.114) ok. it just cannot connect to the host machine.

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• Cheapest iSCSI SAN for Windows 2008/SQL Server clustering?

  - by MichaelGG

  Are there any production-quality iSCSI SANs suitable for use with Windows Server 2008/SQL Server for failover clustering? So far, I've only seen Dell's MD3000i, and HP's MSA 2000 (2012i), which both are around $6K with a minimal disk configuration. Buffalo (yea, I know), has a $1000 device with iSCSI support, but they say it will not work for 2008 failover clustering. I'm interested in seeing something suitable for failover in a production environment, but with very low IO requirements. (Clustering, say, a 30GB DB.) As for using software: On Windows, StarWind seems to have a great solution. But it's actually more money than buying a hardware SAN. (As I understand, only the enterprise edition supports having replicas, and that's $3000 a license.) I was thinking I could use Linux, something like DRBD + an iSCSI target would be fine. However, I haven't seen any free or low-cost iSCSI software that supports SCSI-3 persistent reservations, which Windows 2008 needs for failover clustering. I know $6K isn't much at all, just curious to see if there are practical cheaper solutions out there. And finally, yes, the software is expensive, but many small business get MS BizSpark, so the Windows 2008 Enterprise / SQL 2008 licenses are completely free.

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• OS X random, jumpy dragging behavior

  - by Chris

  This problem has been going on since I got 10.7, and is persisting or even getting worse since I updated to Mavricks. The best way to describe it is thru an example- Let's say I'm working in Safari. Everything is working fine. Then, I'll switch to another app by clicking on it's window, for example, I'll click on Messages to shoot back a reply. When I click back to Safari, keyboard and mouse inputs don't work! The only way I can regain control of the app (Safari) is by clicking on the apps top bar, which then causes the app to jump left or right. If I'm in Messages and I switch back to Safari by clicking said top bar, it works fine. Same with switching back and forth using command-tab. I've narrowed the problem down to this - the first app (Safari, in this example) is, for some reason, deciding that I'm in the process of dragging the window around. This could be just an oddly persistent glitch in my system, but has anyone else seen this before? Perhaps a misplaced default write... somewhere along the line? Update A PRAM reset did absolutely nothing

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• [Ubuntu 10.04] mdadm - Can't get RAID5 Array To Start

  - by Matthew Hodgkins

  Hello, after a power failure my RAID array refuses to start. When I boot I have to sudo mdadm --assemble --force /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 to get mdadm to notice the array. Here are the details (after I force assemble). sudo mdadm --misc --detail /dev/md0: /dev/md0: Version : 00.90 Creation Time : Sun Apr 25 01:39:25 2010 Raid Level : raid5 Used Dev Size : 1465135872 (1397.26 GiB 1500.30 GB) Raid Devices : 6 Total Devices : 6 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Jun 17 23:02:38 2010 State : active, Not Started Active Devices : 6 Working Devices : 6 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 128K UUID : 44a8f730:b9bea6ea:3a28392c:12b22235 (local to host hodge-fs) Events : 0.1249691 Number Major Minor RaidDevice State 0 8 65 0 active sync /dev/sde1 1 8 81 1 active sync /dev/sdf1 2 8 97 2 active sync /dev/sdg1 3 8 49 3 active sync /dev/sdd1 4 8 33 4 active sync /dev/sdc1 5 8 17 5 active sync /dev/sdb1 mdadm.conf: # by default, scan all partitions (/proc/partitions) for MD superblocks. # alternatively, specify devices to scan, using wildcards if desired. DEVICE partitions /dev/sdb1 /dev/sdb1 # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # definitions of existing MD arrays ARRAY /dev/md0 level=raid5 num-devices=6 UUID=44a8f730:b9bea6ea:3a28392c:12b22235 Any help would be appreciated.

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• Something very strange with network

  - by Rodnower

  Hello, I have Windows 7 and I have very strange thing with my network. Some time I was connected through wireless router and my IP was 192.168.2.103, router's IP was 192.168.2.1 and some other IP was 192.168.2.100. The last I get from page "active DHCP clients" of web interface of the router and from "wireless clients" I may to see that 192.168.2.100 not (!) belong to my MAC address. Router build by EDimax. So after that I disabled wireless function of the router and restarted it. In this time I had not ping to 192.168.2.1. Also I had not any other connection, not wireless nor cable, but (!) I still had ping to 192.168.2.100 and I not understand what this voodoo is... C:\Users\Andrey>ping 192.168.2.100 Pinging 192.168.2.100 with 32 bytes of data: Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Ping statistics for 192.168.2.100: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms This is what I had: C:\Users\Andrey>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : Andrey-PC Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Wireless LAN adapter Wireless Network Connection 3: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter #2 Physical Address. . . . . . . . . : 06-1D-7D-40-61-EB DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Wireless LAN adapter Wireless Network Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Gigabyte GN-WS50G (mini) PCI-E WLAN Card Physical Address. . . . . . . . . : 00-1D-7D-40-61-EB DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Ethernet adapter Local Area Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Marvell Yukon 88E8055 PCI-E Gigabit Ethernet Controller Physical Address. . . . . . . . . : 00-1B-24-B6-09-91 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes C:\Users\Andrey>arp -a -v Interface: 127.0.0.1 --- 0x1 Internet Address Physical Address Type 224.0.0.22 static 239.255.255.250 static Interface: 0.0.0.0 --- 0xffffffff Internet Address Physical Address Type 192.168.2.1 00-0e-2e-d2-8c-af invalid 192.168.2.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.252 01-00-5e-00-00-fc static 239.255.255.250 01-00-5e-7f-ff-fa static 255.255.255.255 ff-ff-ff-ff-ff-ff static Interface: 0.0.0.0 --- 0xffffffff Internet Address Physical Address Type 192.168.2.1 00-0e-2e-ff-f1-f6 dynamic 192.168.2.101 00-27-19-bc-8b-9c dynamic 192.168.2.102 00-16-e6-6c-ae-d4 dynamic 192.168.2.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.252 01-00-5e-00-00-fc static 239.255.255.250 01-00-5e-7f-ff-fa static 255.255.255.255 ff-ff-ff-ff-ff-ff static Interface: 0.0.0.0 --- 0xffffffff Internet Address Physical Address Type 224.0.0.22 01-00-5e-00-00-16 static 255.255.255.255 ff-ff-ff-ff-ff-ff static C:\Users\Andrey>route print =========================================================================== Interface List 14...06 1d 7d 40 61 eb ......Microsoft Virtual WiFi Miniport Adapter #2 13...00 1d 7d 40 61 eb ......Gigabyte GN-WS50G (mini) PCI-E WLAN Card 11...00 1b 24 b6 09 91 ......Marvell Yukon 88E8055 PCI-E Gigabit Ethernet Controller 1...........................Software Loopback Interface 1 =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 =========================================================================== Persistent Routes: None IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 1 306 ff00::/8 On-link =========================================================================== Persistent Routes: None Only after reboot I lost ping to there: C:\Users\Andrey>ping 192.168.2.100 Pinging 192.168.2.100 with 32 bytes of data: PING: transmit failed. General failure. PING: transmit failed. General failure. PING: transmit failed. General failure. PING: transmit failed. General failure. Ping statistics for 192.168.2.100: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), So what this mysterious cache is? Thank you for ahead.

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• Windows XP mounting USB drive to same letter as previously mapped network drive

  - by GAThrawn

  Why does Windows always mount a USB drive as the next drive letter after the last physical drive, even when that letter is already taken by a mapped drive, and is there any way to improve this behaviour? What happens is I tend to use a few different flash drives on my PC, as well as having both a Blackberry and a personal phone that mount as USB drives when I plug them in to charge. Being on a corporate PC I also have a number of mapped network drives (some set by login script, some set as persistent mappings in my profile). When I first login I'll have drive letters like this: C: - Local Drive D: - DVD Drive G: - Login script mapped drive J: - Login script mapped drive When I plug the Blackberry in it'll mount two drives (one for onboard storage, one for the SD card) as E: and F:. If I then plug in another USB drive it will mount as G:, even though that's already taken by a network mapped drive. This leaves me with the following drives: C: - Local Drive D: - DVD Drive E: - USB drive (Blackberry) F: - USB drive (Blackberry) G: - Login script mapped drive [G: - USB drive - mounted but not visible in Explorer or command prompt] J: - Login script mapped drive I then have to go into Disk Management, find the new USB drive that's mounted to G: and re-assign it to another letter eg Z:, once this is done Auto-Play detects it and throws up its normal dialog, and its browseable in Explorer. While this is OK to do if you only use one or two USB drives and have admin access to your PC with your login account, its a total pain in the proverbial if you regularly use a whole load of different USB devices, and corporate policy means you have one account for your normal login (that only has User access to workstations), but have to use a different account for any privileged action. I realize that one possible reason for this is the difference between hardware which is mounted and assigned drive letters at the systen level, and mapped drives which are done at the user level. For USB devices that are already plugged in before login, then obviously they're mounted before Windows knows what network drives may be mapped. However if you plug the USB devices in after you're fully logged in and have drives mapped then Windows must know which letters are available?

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• Drive Mapped On Amazon EC2 Instance Startup Disconnected After Logon

  - by jsn

  I am launching an Amazon EC2 instance (Windows Server 2012), and on startup (though User Data field), it runs this powershell script: <powershell> NET CONFIG SERVER /AUTODISCONNECT:-1 # clear all prior connections net use * /delete /y > C:\delLog.txt 2>&1 # mount new drive net use R: \\dbHost\share /user:username pass /persistent:yes > C:\useLog.txt 2>&1 ipconfig /all > C:\ipLog.txt </powershell> When it launches and I connect to it through RDP, it shows in explorer "Diconnected Network Drive (R:). If I double click it, error message displays "R:\ is not accesible. Access id denied". Normally, it would ask me for credentials to reconnect. I need for this drive to be connected through the duration of the instance. delLog.txt contents: You have these remote connections: T: \\dbHost\share Continuing will cancel the connections. The command completed successfully. useLog.txt contents: The command completed successfully. ipLog.txt contents as expected. The net use commands works fine by itself, it connects. Anyone have any idea what could be wrong? There is only one account on these machines - Administrator. It is a samba share to a Linux server on a private network.

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• Internet doesn't work when enable local network

  - by rakesh yadav

  We have the following network setup: A) Router IP 192.168.51.49 B) Windows Server 2008 R2 with dual NIC: Lan A) WAN interface (192.168.51.50) ( Used for internet) Lan B) LAN interface (192.168.30.228) ( used for local connectivity ) When I keep both LAN Enabled than my internet doesn't work, but if I disable my local LAN then internet works fine. How can I resolve this issue? Do I need to do routing on my server Please find the below attached route print result C:\Users\Administrator>route print =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.51.49 192.168.51.50 276 0.0.0.0 0.0.0.0 192.168.30.227 192.168.30.228 266 192.168.30.224 255.255.255.240 On-link 192.168.30.228 266 192.168.30.228 255.255.255.255 On-link 192.168.30.228 266 192.168.30.239 255.255.255.255 On-link 192.168.30.228 266 192.168.51.48 255.255.255.240 On-link 192.168.51.50 276 192.168.51.50 255.255.255.255 On-link 192.168.51.50 276 192.168.51.63 255.255.255.255 On-link 192.168.51.50 276 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 202.56.230.5 255.255.255.255 192.168.51.49 192.168.51.50 21 202.56.230.6 255.255.255.255 192.168.51.49 192.168.51.50 21 192.168.26.124 255.255.255.255 192.168.51.49 192.168.51.50 21 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.51.50 276 224.0.0.0 240.0.0.0 On-link 192.168.30.228 266 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.51.50 276 255.255.255.255 255.255.255.255 On-link 192.168.30.228 266 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 0.0.0.0 0.0.0.0 192.168.30.227 Default 0.0.0.0 0.0.0.0 192.168.51.49 Default ===========================================================================

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• Can't get simple Apache VHost up and running

  - by TK Kocheran

  Unfortunately, I can't seem to get a simple Apache VHost online. I used to simply have one VHost which bound to all: <VirtualHost *:80>, but this isn't appropriate for security anymore. I need to have one VHost for localhost requests (ie my dev server) and one for incoming requests via my domain name. Here's my new VHost: NameVirtualHost domain1.com <VirtualHost domain1.com:80> DocumentRoot /var/www ServerName domain1.com </VirtualHost> <VirtualHost domain2.com:80> DocumentRoot /var/www ServerName domain2.com </VirtualHost> After I restart my server, I see the following errors in my log: [Wed Feb 16 11:26:36 2011] [error] [client ####.###.###.###] File does not exist: /htdocs [Wed Feb 16 11:26:36 2011] [error] [client ####.###.###.###] File does not exist: /htdocs What am I doing wrong? EDIT As per the answer give below, I have modified my configuration. Here are my configuration files: /etc/apache2/ports.conf: Listen 80 <IfModule mod_ssl.c> # If you add NameVirtualHost *:443 here, you will also have to change # the VirtualHost statement in /etc/apache2/sites-available/default-ssl # to <VirtualHost *:443> # Server Name Indication for SSL named virtual hosts is currently not # supported by MSIE on Windows XP. Listen 443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> Here are my actual defined sites: /etc/apache2/sites-enabled/000-localhost: NameVirtualHost 127.0.0.1:80 <VirtualHost 127.0.0.1:80> ServerAdmin ######### DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> RewriteEngine On RewriteLog "/var/log/apache2/mod_rewrite.log" RewriteLogLevel 9 <Location /> <Limit GET POST PUT> order allow,deny allow from all deny from 65.34.248.110 deny from 69.122.239.3 deny from 58.218.199.147 deny from 65.34.248.110 </Limit> </Location> </VirtualHost> /etc/apache2/sites-enabled/001-rfkrocktk.dyndns.org: NameVirtualHost rfkrocktk.dyndns.org:80 <VirtualHost rfkrocktk.dyndns.org:80> DocumentRoot /var/www ServerName rfkrocktk.dyndns.org </VirtualHost> And, just for kicks, my main file: /etc/apache2/apache2.conf: # # Based upon the NCSA server configuration files originally by Rob McCool. # # This is the main Apache server configuration file. It contains the # configuration directives that give the server its instructions. # See http://httpd.apache.org/docs/2.2/ for detailed information about # the directives. # # Do NOT simply read the instructions in here without understanding # what they do. They're here only as hints or reminders. If you are unsure # consult the online docs. You have been warned. # # The configuration directives are grouped into three basic sections: # 1. Directives that control the operation of the Apache server process as a # whole (the 'global environment'). # 2. Directives that define the parameters of the 'main' or 'default' server, # which responds to requests that aren't handled by a virtual host. # These directives also provide default values for the settings # of all virtual hosts. # 3. Settings for virtual hosts, which allow Web requests to be sent to # different IP addresses or hostnames and have them handled by the # same Apache server process. # # Configuration and logfile names: If the filenames you specify for many # of the server's control files begin with "/" (or "drive:/" for Win32), the # server will use that explicit path. If the filenames do *not* begin # with "/", the value of ServerRoot is prepended -- so "/var/log/apache2/foo.log" # with ServerRoot set to "" will be interpreted by the # server as "//var/log/apache2/foo.log". # ### Section 1: Global Environment # # The directives in this section affect the overall operation of Apache, # such as the number of concurrent requests it can handle or where it # can find its configuration files. # # # ServerRoot: The top of the directory tree under which the server's # configuration, error, and log files are kept. # # NOTE! If you intend to place this on an NFS (or otherwise network) # mounted filesystem then please read the LockFile documentation (available # at <URL:http://httpd.apache.org/docs-2.1/mod/mpm_common.html#lockfile>); # you will save yourself a lot of trouble. # # Do NOT add a slash at the end of the directory path. # ServerRoot "/etc/apache2" # # The accept serialization lock file MUST BE STORED ON A LOCAL DISK. # #<IfModule !mpm_winnt.c> #<IfModule !mpm_netware.c> LockFile /var/lock/apache2/accept.lock #</IfModule> #</IfModule> # # PidFile: The file in which the server should record its process # identification number when it starts. # This needs to be set in /etc/apache2/envvars # PidFile ${APACHE_PID_FILE} # # Timeout: The number of seconds before receives and sends time out. # Timeout 300 # # KeepAlive: Whether or not to allow persistent connections (more than # one request per connection). Set to "Off" to deactivate. # KeepAlive On # # MaxKeepAliveRequests: The maximum number of requests to allow # during a persistent connection. Set to 0 to allow an unlimited amount. # We recommend you leave this number high, for maximum performance. # MaxKeepAliveRequests 100 # # KeepAliveTimeout: Number of seconds to wait for the next request from the # same client on the same connection. # KeepAliveTimeout 15 ## ## Server-Pool Size Regulation (MPM specific) ## # prefork MPM # StartServers: number of server processes to start # MinSpareServers: minimum number of server processes which are kept spare # MaxSpareServers: maximum number of server processes which are kept spare # MaxClients: maximum number of server processes allowed to start # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # worker MPM # StartServers: initial number of server processes to start # MaxClients: maximum number of simultaneous client connections # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadsPerChild: constant number of worker threads in each server process # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # event MPM # StartServers: initial number of server processes to start # MaxClients: maximum number of simultaneous client connections # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadsPerChild: constant number of worker threads in each server process # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> # These need to be set in /etc/apache2/envvars User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} # # AccessFileName: The name of the file to look for in each directory # for additional configuration directives. See also the AllowOverride # directive. # AccessFileName .htaccess # # The following lines prevent .htaccess and .htpasswd files from being # viewed by Web clients. # <Files ~ "^\.ht"> Order allow,deny Deny from all Satisfy all </Files> # # DefaultType is the default MIME type the server will use for a document # if it cannot otherwise determine one, such as from filename extensions. # If your server contains mostly text or HTML documents, "text/plain" is # a good value. If most of your content is binary, such as applications # or images, you may want to use "application/octet-stream" instead to # keep browsers from trying to display binary files as though they are # text. # DefaultType text/plain # # HostnameLookups: Log the names of clients or just their IP addresses # e.g., www.apache.org (on) or 204.62.129.132 (off). # The default is off because it'd be overall better for the net if people # had to knowingly turn this feature on, since enabling it means that # each client request will result in AT LEAST one lookup request to the # nameserver. # HostnameLookups Off # ErrorLog: The location of the error log file. # If you do not specify an ErrorLog directive within a <VirtualHost> # container, error messages relating to that virtual host will be # logged here. If you *do* define an error logfile for a <VirtualHost> # container, that host's errors will be logged there and not here. # ErrorLog /var/log/apache2/error.log # # LogLevel: Control the number of messages logged to the error_log. # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. # LogLevel warn # Include module configuration: Include /etc/apache2/mods-enabled/*.load Include /etc/apache2/mods-enabled/*.conf # Include all the user configurations: Include /etc/apache2/httpd.conf # Include ports listing Include /etc/apache2/ports.conf # # The following directives define some format nicknames for use with # a CustomLog directive (see below). # If you are behind a reverse proxy, you might want to change %h into %{X-Forwarded-For}i # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent # # Define an access log for VirtualHosts that don't define their own logfile CustomLog /var/log/apache2/other_vhosts_access.log vhost_combined # Include of directories ignores editors' and dpkg's backup files, # see README.Debian for details. # Include generic snippets of statements Include /etc/apache2/conf.d/ # Include the virtual host configurations: Include /etc/apache2/sites-enabled/ what else do I need to do to fix it? Should I be telling apache to listen on 127.0.0.1:80, or isn't it already listening there?

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• RabbitMQ message consumers stop consuming messages

  - by Bruno Thomas

  Hi server fault, Our team is in a spike sprint to choose between ActiveMQ or RabbitMQ. We made 2 little producer/consumer spikes sending an object message with an array of 16 strings, a timestamp, and 2 integers. The spikes are ok on our devs machines (messages are well consumed). Then came the benchs. We first noticed that somtimes, on our machines, when we were sending a lot of messages the consumer was sometimes hanging. It was there, but the messsages were accumulating in the queue. When we went on the bench plateform : cluster of 2 rabbitmq machines 4 cores/3.2Ghz, 4Gb RAM, load balanced by a VIP one to 6 consumers running on the rabbitmq machines, saving the messages in a mysql DB (same type of machine for the DB) 12 producers running on 12 AS machines (tomcat), attacked with jmeter running on another machine. The load is about 600 to 700 http request per second, on the servlets that produces the same load of RabbitMQ messages. We noticed that sometimes, consumers hang (well, they are not blocked, but they dont consume messages anymore). We can see that because each consumer save around 100 msg/sec in database, so when one is stopping consumming, the overall messages saved per seconds in DB fall down with the same ratio (if let say 3 consumers stop, we fall around 600 msg/sec to 300 msg/sec). During that time, the producers are ok, and still produce at the jmeter rate (around 600 msg/sec). The messages are in the queues and taken by the consumers still "alive". We load all the servlets with the producers first, then launch all the consumers one by one, checking if the connexions are ok, then run jmeter. We are sending messages to one direct exchange. All consumers are listening to one persistent queue bounded to the exchange. That point is major for our choice. Have you seen this with rabbitmq, do you have an idea of what is going on ? Thank you for your answers.

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• How to monitor changes in the frequency of network latency spikes over time?

  - by dequis

  I'm currently trying to troubleshoot an issue with my network in which I get latency spikes up to 200 seconds (normally around 50 secs) in an apparently random way at apparently random moments of the day. While trying to find what part of my messy network needs to be blamed (outside of the scope of this question - discussed a bit on chat), I realized I have no reliable way to confirm that a change actually improved anything. So far, the main way in which i notice this is that irssi shows [Lag: 15 (??)] in the statusbar, increasing every 5 seconds, and all other connections seem to be affected too. Since this depends on my observations, it's not a very reliable method to know how often it really happens. Note that just sending ICMP pings is probably not enough, but that's just my guess. It might be a "bufferbloat" issue, it might be packet loss, it might only apply to persistent connections. I suspect this because a few months ago, when the issue started, I had a "ping" command running in background and it didn't show anything weird at all during the latency spikes. This seems to have changed now (pings don't go through), but still, I'd prefer something more robust.

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• virtualisation with kvm: export services from guest to the host

  - by ascobol

  Hello, I would like to export some services from the guest os to the host os, via kvm, and by the same way learn some things about networking. I have tried the following commands: In the host (kubuntu 10.4): $ sudo tunctl -u ascobol Set 'tap0' persistent and owned by uid 2401 $ sudo ifconfig tap0 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 The ifconfig command returns: $ /sbin/ifconfig tap0 Link encap:Ethernet HWaddr 3e:4e:e3:cc:bc:92 inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::3c4e:e3ff:fecc:bc92/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:17 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 tap0 Then I run the virtual machine (ubuntu server 10.4): $ sudo kvm -hda ubuntuserver104.qcow2 -net nic -net tap,name=tap0,script=no (I'm using sudo because without it fails with the following message:) warning: could not configure /dev/net/tun: no virtual network emulation With sudo the virtual machine boots, I just get this message: pci_add_option_rom: failed to find romfile "pxe-rtl8139.bin" In the virtual machine: $ ifconfig eth0 192.168.2.2 netmask 255.255.255.0 broadcast 192.168.2.255 Now if I run: $ ssh 192.168.2.2 I just get a No route to host What is wrong with this setup ? Thanks !

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• Exchange DiskShadow/Robocopy backup does not purge log files

  - by Robert Allan Hennigan Leahy

  I have a series of scripts setup to backup my Exchange. The following command is executed to start the process: diskshadow /s C:\Backup_Scripts\exchangeserverbackupscript1.dsh This is exchangeserverbackupscript1.dsh: #DiskShadow script file set verbose on #delete shadows all set context persistent writer verify {76fe1ac4-15f7-4bcd-987e-8e1acb462fb7} set metadata C:\Backup_Scripts\shadowmetadata.cab begin backup add volume C: alias SH1 create expose %SH1% P: exec C:\Backup_Scripts\exchangeserverbackupscript1.cmd end backup delete shadows exposed P: exit #End of script And this is exchangeserverbackupscript1.cmd: robocopy "P:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group" "\\leahyfs\J$\E-Mail Backups\Day 1" /MIR /R:0 /W:0 /COPY:DT /B This is not causing Exchange to purge its log files. The edb file is 4.7 gigabytes, but the First Storage Group folder itself is 50+ gigabytes due to many, many log files for each day going back to 2009. Is there any way -- I've Googled and haven't found anything -- to notify Exchange when I've completed a full backup, and have it purge its log files? According to this and this, end backup should cause Exchange to "flush the transaction logs for that storage group" but only "if a successful backup of a storage group occurred", which leaves my question as: What constitutes a "successful backup", and why is what I'm doing not it?

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