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• Seasgate GoFlex NAS + Horrible Speed = Bad Experience

  - by Jon H

  I am having issues with transfer speeds from my desktop PC to my NAS. I have my NAS hooked up to a Gigabit Gateway as well as my Desktop with Cat 5e. I see up to 4.0 MB/Second Transfer Rates, the normal is about 2.5 MB/Seconds. There is 3 Partitions on my NAS, Public, Private, Backup. When I transfer from Private to Public I see the speeds above. If its under the same partition almost instant. I was wondering if the speeds I am seeing is in due to my Computer or the NAS. I was looking into building my own Media Server in due to these horrible speeds. Is their anything I can do in the mean time to speed this up? Motherboard = M3970AM-HP (Angelica) Processor = AMD FX 6100 Ram = 10GB PC3-10600 MB/sec Hard Drive (1) = 1.5TB SATA 3.0GB 5400RPM Hard Drive (2) = 120GB SATA SSD NAS = Seagate 3TB Go Flex Home Connection (1) = 1000 Base T Connection (2) = Wireless N

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• zsh completion will not work in emacs shell

  - by benhsu

  I'm learning about the more powerful tab-completion and expansion capabilities of zsh, and they don't seem to work when I run zsh under emacs with M-x shell: cat $PATH<TAB> expands the tab variable in Terminal, but in shell-mode it just beeps. I poked around the emacs environment and here's what I found: TAB (translated from ) runs the command completion-at-point, which is an interactive compiled Lisp function in `minibuffer.el'. It is bound to TAB, . (completion-at-point) Perform completion on the text around point. The completion method is determined by `completion-at-point-functions'. completion-at-point-functions is a variable defined in `minibuffer.el'. Its value is (tags-completion-at-point-function) So I'm surmising I need to add a function to completion-at-point-functions, but which one?

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• Excel graph: turn stacked bar chart into part bullet chart

  - by Mike

  I've a simple data file that has one column of actuals and another of target against categories. I would like to turn the TARGET figure into a 'Bullet marker'. I've seen it done on other graphs but I'm struggling with the category column being overwritten with the xy axis values. Or if I get close to doing it then the xy markers are not central. I've checked out Peltier but his examples are based on even more comlicated data than mine, so the steps required didn't seem to match up. Help greatly appreciated. Thanks Mike. Example Data: Cat Actual target A 10 15 B 10 12 C 20 17

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• nfs server on cygwin slow

  - by Weltenwanderer

  The setup: We run an instance of cygwin nfsd on a Windows 2008 Server (Xeon 3,2 GHz). There are several Sun Solaris and SunOS machines accessing the shares. This is the exports file: /disk3 (rw,all_squash) /disk2 (rw,all_squash) Those paths are soft linked to the relevant cygdrive/d/path/to/dir paths. Some of the folders contain up to 10k files. The Problem: ls -la on the mounted folder on the sun boxes takes 2 - 3 minutes and the general read performance is really bad. cat filename displays the file in slow bursts and this hurts performance on tasks that access those shared files heavily. Processor load is not the issue, the nfs server idles most of the time, the cygwin tasks never get over 1% load.

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• File ownership and permissions on web site PHP files

  - by columbo

  Hello, I am learning the basics of linux servers so I am green. I have an Ubuntu server upon which there are websites that I have inherited. In a fit of security worry I decided to check out the ownership of the web site files. They are all 2016:sites. If I run the command 'cat /etc/group | more' I can see that the group exists. But when I run 'lastlog' the user 2016 does not appear. I started to worry that 2016 might be the username of web users connecting from the web so I set the permissions on a testfile to chmod 600, giving read permissions to only the file owner. Sure enough I could still access the file from the web. Can anyone suggest what is going on here? I tried creating a new user and giving them file ownership but then when I access the file from the web it wants me to have all directories up stream owned by the same person. Thanks

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• Where is debian storing its network settings?

  - by user13743

  I have a debian machine that is supposed to have a static ip, but insists on getting its address from the DHCP server. Here's this settings file: $> cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 iface eth0 inet static address 192.168.1.99 gateway 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 Yet $> sudo /etc/init.d/networking restart Reconfiguring network interfaces...done. $> sudo ifconfig eth0 Link encap:Ethernet HWaddr 00:e0:03:09:05:2e inet addr:192.168.1.205 Bcast:255.255.255.255 Mask:255.255.255.0 ... Where is it being told to use dhcp?

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• Methodologies for performance-testing a WAN link

  - by Chopper3

  We have a pair of new diversely-routed 1Gbps Ethernet links between locations about 200 miles apart. The 'client' is a new reasonably-powerful machine (HP DL380 G6, dual E56xx Xeons, 48GB DDR3, R1 pair of 300GB 10krpm SAS disks, W2K8R2-x64) and the 'server' is a decent enough machine too (HP BL460c G6, dual E55xx Xeons, 72GB, R1 pair of 146GB 10krpm SAS disks, dual-port Emulex 4Gbps FC HBA linked to dual Cisco MDS9509s then onto dedicated HP EVA 8400 with 128 x 450GB 15krpm FC disks, RHEL 5.3-x64). Using SFTP from the client we're only seeing about 40Kbps of throughput using large (2GB) files. We've performed server to 'other local server' tests and see around 500Mbps through the local switches (Cat 6509s), we're going to do the same on the client side but that's a day or so away. What other testing methods would you use to prove to the link providers that the problem is theirs?

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• CentOS 6: Can not start NFS

  - by Chris

  I am unable to start the NFS service. When starting there is no error. But the services are stopt after it. No messages at all in /var/log/messages. Same happens to rpcbind serivce. Any idea what this could be? I also tried to disable iptables. [root@server1 ~]# service nfs start [root@server1 ~]# service nfs status rpc.svcgssd is stopped rpc.mountd is stopped nfsd is stopped rpc.rquotad is stopped [root@server1 ~]# service rpcbind start [root@server1 ~]# service rpcbind status rpcbind is stopped [root@server1 ~]# cat /etc/exports /tmp *(ro) [root@server1 ~]# chkconfig --list | egrep '(rpcbind|nfs)' nfs 0:off 1:off 2:on 3:on 4:on 5:on 6:off nfslock 0:off 1:off 2:on 3:on 4:on 5:on 6:off rpcbind 0:off 1:off 2:on 3:on 4:on 5:on 6:off

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• Dovecot and StartSSL problems with issuer

  - by knoim

  I am using dovecot (1) and trying to get my StartSSL certificate running. ssl_key_file points to my private key I tried pointing ssl_cert_file to my public key, with and without using the class1 certificate from http://www.startssl.com/certs/sub.class1.server.ca.pem as ssl_ca_file aswell as combing them with cat publickey sub.class1.server.ca.pem chained My mail client keeps telling me the certificate has no issuer, but doing openssl x509 on my public certificate tells me it is C=IL, O=StartCom Ltd., OU=Secure Digital Certificate Signing, CN=StartCom Class 1 Primary Intermediate Server CA My option for the CSR were: openssl req -new -newkey rsa:4096 -nodes Dovecot's log doesn't mention any problems. EDIT: Doesn't seem to be a problem with dovecot. I am having the same problem with postfix. openssl verify gives me the same error.

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• How to use second volume devide of amazon EC2

  - by Khoyendra Pande

  I have two volumes of amazon EC2 where by default 1 GiB volume using which has fulled. Now I want to use my second volume which is 9 Gim. I used command cat /proc/partitions I got major minor #blocks name 202 1 1048576 xvda1 202 80 9437184 xvdf Then I hit mkfs.ext3 -F /dev/sdf its showing mkfs.ext3: No such file or directory while trying to determine filesystem size then I hit command df and I got Filesystem 1K-blocks Used Available Use% Mounted on /dev/xvda1 1032088 1031280 0 100% / tmpfs 313160 8 313152 1% /lib/init/rw udev 297800 24 297776 1% /dev tmpfs 313160 4 313156 1% /dev/shm overflow 1024 32 992 4% /tmp means still I am unable to use my 9 GiB space Volume. I am conform I have two volume where attachment information is i-7e4fb41c:/dev/sda1 (attached) and i-7e4fb41c:/dev/sdf (attached) where only sda1 is using. Any one know how may I use my second volume(sdf). Thx

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• How to mount remote sambe from local host with multiple groups ?

  - by Dragos

  I am using mount.cifs to mount a remote samba share (both client and server are Ubuntu server 8.04) like this: mount.cifs //sambaserver/samba /mountpath -o credentials=/path/.credentials,uid=someuser,gid=1000 `$ cat .credentials username=user password=password I mounted a user from local system with username and password with mount.cifs but the problem is that the user is part of multiple groups on the remote system and with mount.cifs I can only specify one gid. Is there a way to specify all the gids that the remote user has ? Is there a way to: 1) Mount the remote samba with multiple groups on the local system ? 2) Browse the mount from 1) with the terminal since I want to pass some files from samba as arguments to local programs. Other solutions would be: nautilus sftp:// which runs through gvfs but the newer gnome does not write to disk the ~/.gvfs anymore so I can't browse it in terminal. An the last solution would be nfs but that means that I have to synchronize the uids and gids on the local system with the ones from the server.

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• How to use public-key ssh authentication

  - by Poma

  I have 2 ubuntu 12.04 (beta) servers (node1 and node2) and want to establish passwordless root access between them. Other users should not have access to other boxes. Also note that ssh default port is changed to 220. Here's what I did: sudo -i cd /root/.ssh ssh-keygen -t rsa # with default name and empty password cat id_rsa.pub > authorized_keys then copied id_rsa & id_rsa.pub to node2 and added id_rsa.pub to authorized_keys. Both hosts have the same /root/.ssh/config file: Host node1 Hostname 1.2.3.4 Port 220 IdentityFile /root/.ssh/id_rsa Host node2 Hostname 5.6.7.8 Port 220 IdentityFile /root/.ssh/id_rsa Now the problem is that when I type ssh node2 it asks me for password. What may be the problem?

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• ldirectord ipvsadm not show reals ip and not work wtih pacemaker and corosync

  - by miguer27

  first thanks for your time. I'm having a problem with ldirectord that I can not solve, I comment my situation: I have two nodes with pace maker and corosync and configure somes resources: root@ldap1:/home/mamartin# crm status Last updated: Tue Jun 3 12:58:30 2014 Last change: Tue Jun 3 12:23:47 2014 via cibadmin on ldap1 Stack: openais Current DC: ldap2 - partition with quorum Version: 1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff 2 Nodes configured, 2 expected votes 7 Resources configured. Online: [ ldap1 ldap2 ] Resource Group: IPV_LVS IPV_4 (ocf::heartbeat:IPaddr2): Started ldap1 IPV_6 (ocf::heartbeat:IPv6addr): Started ldap1 lvs (ocf::heartbeat:ldirectord): Started ldap1 Clone Set: clon_IPV_lo [IPV_lo] Started: [ ldap2 ] Stopped: [ IPV_lo:1 ] root@ldap1:/home/mamartin# crm configure show node ldap2 \ attributes standby="off" node ldap1 \ attributes standby="off" primitive IPV-lo_4 ocf:heartbeat:IPaddr \ params ip="192.168.1.10" cidr_netmask="32" nic="lo" \ op monitor interval="5s" primitive IPV-lo_6 ocf:heartbeat:IPv6addrLO \ params ipv6addr="[fc00:1::3]" cidr_netmask="64" \ op monitor interval="5s" primitive IPV_4 ocf:heartbeat:IPaddr2 \ params ip="192.168.1.10" nic="eth0" cidr_netmask="25" lvs_support="true" \ op monitor interval="5s" primitive IPV_6 ocf:heartbeat:IPv6addr \ params ipv6addr="[fc00:1::3]" nic="eth0" cidr_netmask="64" \ op monitor interval="5s" primitive lvs ocf:heartbeat:ldirectord \ params configfile="/etc/ldirectord.cf" \ op monitor interval="20" timeout="10" \ meta target-role="Started" group IPV_LVS IPV_4 IPV_6 lvs group IPV_lo IPV-lo_6 IPV-lo_4 clone clon_IPV_lo IPV_lo \ meta interleave="true" target-role="Started" location cli-prefer-IPV_LVS IPV_LVS \ rule $id="cli-prefer-rule-IPV_LVS" inf: #uname eq ldap1 colocation LVS_no_IPV_lo -inf: clon_IPV_lo IPV_LVS property $id="cib-bootstrap-options" \ dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \ cluster-infrastructure="openais" \ expected-quorum-votes="2" \ no-quorum-policy="ignore" \ stonith-enabled="false" \ last-lrm-refresh="1401264327" rsc_defaults $id="rsc-options" \ resource-stickiness="1000" The problem is in the ipvsadm only show a one real IP, when i configured two now, show the ldirector.cf: root@ldap1:/home/mamartin# ipvsadm IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags - RemoteAddress:Port Forward Weight ActiveConn InActConn TCP ldap-maqueta.cica.es:ldap wrr - ldap2.cica.es:ldap Route 4 0 0 TCP [[fc00:1::3]]:ldap wrr - [[fc00:1::2]]:ldap Route 4 0 0 root@ldap1:/home/mamartin# cat /etc/ldirectord.cf checktimeout=10 checkinterval=2 autoreload=yes logfile="/var/log/ldirectord.log" quiescent=yes #ipv4 virtual=192.168.1.10:389 real=192.168.1.11:389 gate 4 real=192.168.1.12:389 gate 4 scheduler=wrr protocol=tcp checktype=on #ipv6 virtual6=[[fc00:1::3]]:389 real6=[[fc00:1::1]]:389 gate 4 real6=[[fc00:1::2]]:389 gate 4 scheduler=wrr protocol=tcp checkport=389 checktype=on and in the logs I see nothing clear: root@ldap1:/home/mamartin# ldirectord -d /etc/ldirectord.cf start DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.11:389 -g -w 0) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.11:389 -g -w 0) DEBUG2: Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) DEBUG2: Disabled real server=on:tcp:192.168.1.11:389:::4:gate:\/: (virtual=tcp:192.168.1.10:389) DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 0) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 0) DEBUG2: Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) DEBUG2: Disabled real server=on:tcp:192.168.1.12:389:::4:gate:\/: (virtual=tcp:192.168.1.10:389) DEBUG2: Checking on: Real servers are added without any checks DEBUG2: Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) Destination already exists root@ldap1:/home/mamartin# cat /var/log/ldirectord.log [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) failed: [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Added real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: 192.168.1.11:389 (tcp:192.168.1.10:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Restored real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: [[fc00:1::2]]:389 (tcp:[[fc00:1::3]]:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] system(/sbin/ipvsadm -a -t [[fc00:1::3]]:389 -r [[fc00:1::2]]:389 -g -w 4) failed: [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Added real server: [[fc00:1::2]]:389 ([[fc00:1::3]]:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: [[fc00:1::1]]:389 (tcp:[[fc00:1::3]]:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Restored real server: [[fc00:1::1]]:389 ([[fc00:1::3]]:389) (Weight set to 4) do not know if this is a bug or a configuration error, can anyone help? Regards.

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• Cat5 wiring in my home [closed]

  - by Mike

  I have problem with cat5 cabling First I ran a length of cable 30 metres to my bedroom 1 and and connected both ends to a wall sockets internally using my punch down tool, both ends look fine. I also ran a cable from bedroom 1 to bedroom 2 so my son can use same internet connection , i then parallel connected my cables in bedroom 1 against using punch down tool using same colours all the way through. I ran a Ethernet cable from modem to first wall socket close to it then at bedroom end used another Ethernet cable to connect pc, it wouldn't connect to pc so I disconnected bedroom 2 cable from bedroom 1 socket. I connected bedroom 1 to pc and it worked, but how do I connect bedroom 2 (obviously cat 5 cable bedroom 1 to 2 is in place) As soon as I connect one wire from bedroom2 I loose Internet connection!

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• What is the right way to use Internet Sharing in OS X?

  - by Bob King

  For a while now I've been using the Wireless in my Mac Mini as a seperate WiFi access point because my main router doesn't quite cover my whole house. There is a dedicated CAT 5E line down to the Mini, which has a static IP address. I've turned Internet Sharing on, using Airport/WiFi but it seems my options for security are limited. Can I do WPA2? Also, it seems like my iPhone only connects 25% of the time, and the rest of the time it claims I've given a bad password. I've tried "Forget this network" repeatedly.

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• How to mount remote samba share from local host with multiple groups?

  - by Dragos

  I am using mount.cifs to mount a remote samba share (both client and server are Ubuntu server 8.04) like this: mount.cifs //sambaserver/samba /mountpath -o credentials=/path/.credentials,uid=someuser,gid=1000 $ cat .credentials username=user password=password I mounted a user from local system with username and password with mount.cifs but the problem is that the user is part of multiple groups on the remote system and with mount.cifs I can only specify one gid. Is there a way to specify all the gids that the remote user has? Is there a way to: Mount the remote samba with multiple groups on the local system? Browse the mount from 1) with the terminal since I want to pass some files from samba as arguments to local programs. Other solutions would be: nautilus sftp:// which runs through gvfs; but the newer gnome does not write to disk the ~/.gvfs anymore so I can't browse it in terminal. And the last solution would be NFS but that means that I have to synchronize the uids and gids on the local system with the ones from the server.

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• LInux (Ubuntu Karmic) equivalent to Pawsense

  - by LRE

  I now work from a home office - much to the delight of my cats. One in particular likes to come for a hug several times a day. That in itself is fine but he tends to sit on my laptop keyboard whilst I'm working on my desktop and vice-versa. Also he'll walk across any keyboard I'm actually using at the time. I've found Pawsense and would like to know if anyone can suggest a Linux equivalent (or some incantations to achieve the same). Training him out of sitting on the keyboard is likely to prove fruitless (a suggested here). He's far more pig-headed than I am. This conversation discusses some utilities like xlock et al but I'd prefer if possible to have something more along the lines of Pawsense that doesn't lock the keyboard but "simply" intercepts cat-like typing. Thanks

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• How to tell if linux disk IO is causing excessive (> 1 second) application stalls

  - by noahz

  I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for several seconds at a time. I suspect that something related to ext3 vsfs (Veritas Filesystem) functionality (and/or how it interacts with the OS) is the culprit. What steps can I take to confirm or refute this theory? I am aware of iostat and /proc/diskstats as starting points. Revised title to de-emphasize journaling and emphasize "stalls" I have done some googling and found at least one article that seems to describe behavior like I am observing: Solving the ext3 latency problem Additional Information Red Hat Enterprise Linux Server release 5.3 (Tikanga) Kernel: 2.6.18-194.32.1.el5 Primary application disk is fiber-channel SAN: lspci | grep -i fibre 14:00.0 Fibre Channel: Emulex Corporation Saturn-X: LightPulse Fibre Channel Host Adapter (rev 03) Mount info: type vxfs (rw,tmplog,largefiles,mincache=tmpcache,ioerror=mwdisable) 0 0 cat /sys/block/VxVM123456/queue/scheduler noop anticipatory [deadline] cfq

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• does the *physical* order/location of drives in a mdadm-managed RAID-10 array matter?

  - by locuse

  i've setup a 4-drive RAID-10 array using mdadm-managed, software-raid on an x86_64 box. it'd up & running and works as expected, cat /proc/mdstat md127 : active raid10 sdc2[2] sdd2[3] sda2[0] sdb2[1] 1951397888 blocks super 1.2 512K chunks 2 far-copies [4/4] [UUUU] bitmap: 9/466 pages [36KB], 2048KB chunk atm the four SATA drives are physically plugged into the motherboard's 1st four SATA ports. i'd like to gather the necessary/complete info for catastrophic recovery. reading starting here, http://neil.brown.name/blog, and the mailing list, i'm not yet completely confident i have it right. i understand 'drive order matters'. is that logical, &/or physical order that matters? if i unplugged the four drives in this array, and plugged them each back into different ports on the motherboard or a pci card, as long as i've changed nothing in software config, will the array correctly auto-re-assemble?

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• Escape a ! in the password parameter of wget

  - by Dave

  I'm trying to execute something like this: wget --user=foo --password=bar! url The ! in the password is causing problems. I've tried escaping it with \, as in --password=bar\! I've tried encapsulating in single and double quotes. I put the password in a separate file and tried --password=cat pass.txt Each time, I get a 403 Forbidden. Using -d, I see that the SSL handshake is successful. On the Windows command line, the command works. My assumption is that I need to escape the ! differently, but I don't know how else.

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• openssl creates invalid signature if run by a different user

  - by divB

  Very strange problem here: openssl successfully creates signatures but only those created as root are valid whereas created by another user (www-data) are invalid! All files are readable and there are not error messages: # echo -ne Test | openssl dgst -ecdsa-with-SHA1 -sign activation.key > /tmp/asRoot.der # su www-data $ echo -ne Test | openssl dgst -ecdsa-with-SHA1 -sign activation.key > /tmp/asWww-data.der $ uname -a Linux linux 2.6.32-5-openvz-amd64 #1 SMP Mon Feb 25 01:16:25 UTC 2013 i686 GNU/Linux $ cat /etc/debian_version 6.0.7 Both files (asRoot.der and asWww-data.der) are transfered to a different computer for verification with the public key: $ echo -ne Test | openssl dgst -verify activation.pub -keyform DER -signature asRoot.der Verified OK $ echo -ne Test | openssl dgst -verify activation.pub -keyform DER -signature asWww-data.der Verification Failure That can't be true! What's wrong here?

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• mdadm - Recovering a 'split' RAID1 array

  - by Hamza

  I have two drives that used to be part of a single RAID1 volume but it appears that one of them went offline for some time, something I've noticed just now when I rebooted my system. I now seem to have two RAID volumes, as reported by: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc[1] 2096116 blocks super 1.2 [2/1] [_U] md127 : active (auto-read-only) raid1 sdb[0] 2096116 blocks super 1.2 [2/1] [U_] unused devices: <none> Not exactly sure where to go from here. How can I merge and re-sync these volumes without data loss? Thanks.

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• Disable NSS LDAP IPv6 (AAAA) lookups

  - by pilcrow

  Question: How can I disable inet6 AAAA queries for my LDAP server during (LDAP-backed) NSS lookups on a CentOS (RHEL) 5 machine? Background: I've servers configured to consult ldap://ldap.internal for NSS passwd and group lookups. Every relevant NSS lookup, for example the getpwuid(3) implied by an ls -l which needs to translate UIDs to network user names, performs the following DNS dance before connecting to the ldap server: AAAA? ldap.internal -> (no records) AAAA? ldap.internal.internal -> NXDomain A? ldap.internal -> 192.168.3.89 I'd like to skip the first two queries completely. Configuration: [server]$ cat /etc/redhat-release CentOS release 5.4 (Final) [server]$ grep ^passwd /etc/nsswitch.conf passwd: files ldap [server]$ grep ^uri /etc/ldap.conf uri ldap://ldap.internal/ For what it's worth, IPv6 support is otherwise disabled on these systems: [server]$ grep off /etc/modprobe.conf alias ipv6 off alias net-pf-10 off [server]$ echo "$(ip a | grep -c inet6) IPv6-enabled interfaces" 0 IPv6-enabled interfaces

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• Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

  - by magneticMonster

  I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing. Why am I running out of lowmem and how do I increase it? Some details: $ cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 $ free -lm total used free shared buffers cached Mem: 32086 24611 7475 0 0 24012 Low: 464 407 57 High: 31621 24204 7417 -/+ buffers/cache: 598 31487 Swap: 2047 0 2047

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• All invalid hosts gets resolved to "com.org"

  - by Vi

  vi@vi-server:~$ nslookup nonexistent.itransition.com Server: 8.8.8.8 Address: 8.8.8.8#53 ** server can't find nonexistent.itransition.com: NXDOMAIN vi@vi-server:~$ cat /etc/resolv.conf nameserver 8.8.8.8 It does not exist. The same result from dig nonexistent.itransition.com. vi@vi-server:~$ ping nonexistent.itransition.com PING nonexistent.itransition.com.org (216.234.246.153) 56(84) bytes of data. 64 bytes from 99.f6.ead8.static.theplanet.com (216.234.246.153): icmp_seq=1 ttl=46 time=128 ms 64 bytes from 99.f6.ead8.static.theplanet.com (216.234.246.153): icmp_seq=2 ttl=46 time=128 ms It catches all invalid hostnames? Why? How to prevent?

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