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• CDN Rerouting on 404 (file not yet in synch with original storage)

  - by Alan Ristic

  Here is the problem. I've setup my app(on EC2) to store uploaded images directly on Amazon S3. I'd like to be able to serve static files(cdn) from my 'home' server so I wrote script that does sync from S3. But there is a window of (at least) one minute in synch. Now I see two solutions on the problem of pics not been available on 'home' server here: 1.I write script on EC2 (where the app resides) to fetch from DB pics that have status of "not-yet-synch", which is default state when user uploads picture. The script then does a ping to picture and if it gets OK response, updates DB from "not-yet-synch" to "synch". 2.Prefered solution would be to let apache (in this case) redirect request for an image if it sees 404 (e.g. doesent find image requested) to S3. This way I wouldn't need script from solution 1. So what approach do you suggest I take in solving this redundancy problem? Or what is practice in production environments? To further clarify; I'd like so serve images first from 'home' server, if that fails serve them from S3. Tnx, Alan

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• What steps should I take to debug this non-starting hvm virtual machine?

  - by Ophidian

  I have a dom0 machine running CentOS 5.4 with all the latest updates using Xen as my hypervisor. I am using Xen in part because this machine was set up prior to KVM being included in RHEL, and in part because KVM's network bridging configuration is not nearly as simple as Xen's. The dom0 machine is headless and I do all of my VM management via virsh from the command line. I have two hvm domU's: A web server running CentOS 5.4 A mail server running Gentoo Both VM's are backed by LV's on the dom0 but do not use LVM in the domU. Both have virtually identical libvirt configurations (differing by expected things like name, UUID, NIC MAC, VNC port, etc). The web server domU (WSdomU hereafter) does not start since applying the most recent kernel update (kernel-xen-2.6.18-164.15.1.el5.x86_64 and kernel-2.6.18-164.15.1.el5.x86_64 for the dom0 and WSdomU respectively). By 'not start' I mean it appears to be running but it does not use an CPU cycles, does not bring up a graphical console, and does not respond on the network. The WSdomU is listed as no state rather than the normal running or blocked in xentop. The mail server domU starts fine and functions normally. Here are the steps I have taken so far that did not solve the problem: Reboot the dom0 to see if things come up on their own Check xen dmesg on dom0 Check xend logs (a cursory viewing did not show anything blatant; specific suggestions of things to look for would be appreciated) Attempted to connect to the WSdomU's graphical (VNC) console from the dom0 Shutdown the mail server domU and attempt to start the WSdomU Check the SELinux labels on backing LV's (they're the same) Set SELinux to permissive and attempt to start the WSdomU Use virsh edit to try tweaking the WSdomU config virsh undefine, reboot, virsh define the WSdomU config dd the WSdomU LV to an .img file, copy it to my Fedora desktop and run it under KVM (works fine) What steps should I take next to debug this? I will edit in any additional configuration's requested in the comments.

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• cannot connect to <server_name>\sqlexpress

  - by Jackson Sunuwar

  I have tried disabling firing wall and checked sqlbrowser is started but for some reason I cannnot connect to my datbase... called server_name\sqlexpress.. I have a virtual machine and a full scale MS SQL Server 2008 R2 running on it... and I have several other vm running sqlexpress. they run fine and I can connect to them using sqlexpress... but when i try to access from sqlserver... I get this error. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) Digging deep into the error, I found this Error Number: -1 Severity: 20 State: 0 and finally this... Program Location: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server) at Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser() Firewall is turned off on the VM that's running mssqlserver... I turned of firewall on one of the vm that's running the sqlexpress but I still get the error... can someone please help... thank you

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• Website has become slower on a VPS, was much fast on a shared host. What's wrong?

  - by Arpit Tambi

  My shared host suspended my website stating system overload, so I moved my website to a VPS which has 4GB RAM. But for some reason the website has become very slow. This is the vmstat output - procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 0 3050500 0 0 0 0 0 1 0 0 0 0 100 0 0 Here's the Apache Benchmark output for a STATIC html page I ran on the server itself - Benchmarking www.ask-oracle.com (be patient)...apr_poll: The timeout specified has expired (70007) Total of 20 requests completed Update: Server Config: List item Centos 5.6 4 cores cpu 4 GB RAM LAMP stack with APC Wordpress Only one website It takes almost double time to load now, same website was much fast on shared hosting. I know I need to tweak some settings but have no clue where to start from? I have already tried to optimize apache, mysql etc. Update 2: CPU usage is low, see uptime output: 11:09:02 up 7 days, 21:26, 1 user, load average: 0.09, 0.11, 0.09 Update 3: When I load any webpage, browser shows "Waiting" for a long time and then page loads quickly. So I suspect server can accept only limited connections and holds extra connections in a waiting state. How to check this? Update 4: Following is the output on executing netperf TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain (127.0.0.1) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 9615.40 [root@ip-118-139-177-244 j3ngn5ri6r01t3]# Here are the Apache MPM settings from httpd.conf, do they look okay? <IfModule worker.c> StartServers 5 MaxClients 100 MinSpareThreads 50 MaxSpareThreads 250 ThreadsPerChild 125 MaxRequestsPerChild 10000 ServerLimit 100 </IfModule>

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• Ext3 fs: Block bitmap for group 1 not in group (block 0). is fs dead?

  - by ip

  My company has a server with one big partition with Mysql database and php files. Now this partition seems to be corrupted, as reported from kernel messages when I tried to mount it manually: [329862.817837] EXT3-fs error (device loop1): ext3_check_descriptors: Block bitmap for group 1 not in group (block 0)! [329862.817846] EXT3-fs: group descriptors corrupted! I've tried to recovery it running tools from a PLD livecd. These are the tools I have tested: - e2retrieve - testdisk - photorec - dd_rescue/dd_rhelp - ddrescue - fsck.ext2 - e2salvage without any success. dumpe2fs 1.41.3 (12-Oct-2008) Filesystem volume name: /dev/sda3 Last mounted on: <not available> Filesystem UUID: dd51610b-6de0-4392-a6f3-67160dbc0343 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal filetype sparse_super Default mount options: (none) Filesystem state: not clean with errors Errors behavior: Continue Filesystem OS type: Linux Inode count: 9502720 Block count: 18987570 Reserved block count: 949378 Free blocks: 11555345 Free inodes: 11858398 First block: 0 Block size: 4096 Fragment size: 4096 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 16384 Inode blocks per group: 512 Last mount time: Wed Mar 24 09:31:03 2010 Last write time: Mon Apr 12 11:46:32 2010 Mount count: 10 Maximum mount count: 30 Last checked: Thu Jan 1 01:00:00 1970 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Journal backup: inode blocks dumpe2fs: A block group is missing an inode table while reading journal inode e2fsck 1.41.3 (12-Oct-2008) fsck.ext3: Group descriptors look bad... trying backup blocks... fsck.ext3: A block group is missing an inode table while checking ext3 journal for /dev/sda3 I tried also backup superblocks, same error result. There's any other tools I have to test before considering these disk definitely unrecoverable? Many thanks, ip

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• Synaptics touchpad stops working randomly

  - by Jus12

  I have two laptops. One dell Vostro and other Vaio Z. Both have Synaptics (Yes, I have checked, and the original drivers were from Synaptics as well). On both laptops, the touchpad scrolling stops working at some arbitrary time and nothing seems to solve it except a reboot. Sometimes, it randomly starts working again. I have downloaded all latest drivers from OEM. Interestingly, when I run a program as Administrator, scrolling works in that window only. This problem is very odd. It happens without any reason and I've not been able to find a fix for more than a year. I have seen some unusual suggestions on forums (e.g., to "restore windows to a previous working state") but never any fix that solves this issue properly. I have tried installing latest drivers and I DO NOT want to restore windows to a previous working configuration. OS: Windows 7 64 bit Professional (Sony Vaio Z - VPCZ128GG) Windows 7 32 bit Professional (Dell) Edit: Temporary solution is to uninstall the synaptics driver and let Windows 7 use its default built in one. However, I really prefer the Synaptic driver because it activates the scroll button rather than the mouse wheel (useful in some apps such as MS Photo Editor)

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• Disabling Keyboard Wakeup for Ubuntu 10.04 on Acer 1810TZ

  - by sybreon

  My Acer Aspire 1810TZ laptop suspends fine but wakes up on any slight key-press. I would like to disable this behaviour. I read that it involves disabling something in the /proc/acpi/wakeup but SLPB does not seem to be listed at all. root@1810TZ:/etc# cat /proc/acpi/wakeup Device S-state Status Sysfs node UHC0 S3 disabled pci:0000:00:1d.0 UHC1 S3 disabled pci:0000:00:1d.1 UHC2 S3 disabled pci:0000:00:1d.2 UHCR S3 disabled EHC1 S3 disabled pci:0000:00:1d.7 UHC3 S3 disabled pci:0000:00:1a.0 UHC4 S3 disabled UHC5 S3 disabled EHC2 S3 disabled pci:0000:00:1a.7 EXP1 S4 disabled pci:0000:00:1c.0 PXSX S4 disabled pci:0000:01:00.0 EXP2 S4 disabled PXSX S4 disabled EXP3 S4 disabled PXSX S4 disabled EXP4 S4 disabled pci:0000:00:1c.3 PXSX S4 disabled pci:0000:02:00.0 EXP5 S4 disabled PXSX S4 disabled EXP6 S4 disabled PXSX S4 disabled However, the relevant bits seem to be detected from dmesg. [ 0.357628] ACPI: AC Adapter [ACAD] (on-line) [ 0.357749] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0 [ 0.357754] ACPI: Power Button [PWRB] [ 0.357817] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input1 [ 0.359319] ACPI: Lid Switch [LID0] [ 0.359390] input: Sleep Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input2 [ 0.359394] ACPI: Sleep Button [SLPB] [ 0.359475] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input3 [ 0.359479] ACPI: Power Button [PWRF] Not quite sure what to do next.

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• ports only available from the outside network

  - by ChrisJ

  This is a counter-intuitive problem for me. I have a new Win 2003 server on a static IP address w.x.y.z. Tomcat 7, PostgreSQL 9.1, and Subversion are installed. All of it appears to be working fine from the server itself. We can also access the Tomcat manager, web applications, and run "svn ls svn://w.x.y.z/" from outside our network. However, when I try from another machine in the office, phpPgAdmin and svn cannot establish connections with the server. http://w.x.y.z:5432/phppgadmin cannot connect. The svn command from above returns: svn: E730061: Unable to connect to a repository at URL 'svn://w.x.y.z/' svn: E730061: Can't connect to host 'w.x.y.z': No connection could be made because the target machine actively refused it. Tomcat manager and the other web apps we have deployed work fine. Netstat -a from the server shows this: Proto Local Address Foreign Address State TCP SERVERNAME:3690 SERVERNAME:0 LISTENING TCP SERVERNAME:5432 SERVERNAME:0 LISTENING Windows Firewall was off, but just in case I also tried to enable it and open ports 3690 (svn) and 5432 (postgres). No change. I don't have access to the router/switch because it just doesn't work that way in Port-au-Prince and our sysadmin is on R&R. Is there anything that might be causing the problem from the server side?

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• Configuring https access on HP A5120 Switch

  - by GerryEgan

  I am trying to configure HTTPS management on a HP a5120 switch running Version 5.20.99, Release 2215 and not having much luck. I have followed the manual by creating an SSL policy first and then enabling the HTTPS server with the SSL policy: ssl server-policy sslpol ip https ssl-server-policy sslpol ip https enable When I try and log onto the switch with Google Chrome I get the following error: Error 107 (net::ERR_SSL_PROTOCOL_ERROR): SSL protocol error. When I look this up I have found references to errors due to TLS being used in SSL. I can find no way to specify the SSL version in the server policy. The manual has a configuration example that uses MSCEP to retrieve a certificate but in Windows 2008 R2 that feature is only available in Enterprise and Datacentre editions which I don't have. I have SSH configured and it is using a locally generated certificate so I'm not sure if I can use that but I'd like to if possible. Has anybody been able to setup HTTPS management on HP A series switches without MSCEP? Any and all help appreciated! here is a copy of my config with the interfaces removed: version 5.20.99, Release 2215 # sysname MYSYSNAME # irf domain 10 irf mac-address persistent timer irf auto-update enable undo irf link-delay # domain default enable system # telnet server enable # vlan 1 # vlan 100 description Management # radius scheme system primary authentication 127.0.0.1 1645 primary accounting 127.0.0.1 1646 user-name-format without-domain # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher authorization-attribute level 3 service-type ssh telnet terminal service-type web # stp enable # ssl server-policy sslpol pki-domain MYDOMAIN # interface NULL0 # interface Vlan-interface199 ip address 192.168.199.140 255.255.255.0 # interface GigabitEthernet1/0/1 poe enable stp edged-port enable # interface Ten-GigabitEthernet2/1/2 # dhcp-snooping # ntp-service unicast-server 192.168.1.71 # ssh server enable # ip https ssl-server-policy sslpol ip https enable # load xml-configuration # user-interface aux 0 1 user-interface vty 0 15 authentication-mode scheme

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• How to get an inactive RAID device working again?

  - by Jonik

  After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount /opt mount: wrong fs type, bad option, bad superblock on /dev/md_d0, missing codepage or helper program, or other error (could this be the IDE device where you in fact use ide-scsi so that sr0 or sda or so is needed?) In some cases useful info is found in syslog - try dmesg | tail or so The RAID device appears to be inactive somehow: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d0 : inactive sda4[0](S) 241095104 blocks # mdadm --detail /dev/md_d0 mdadm: md device /dev/md_d0 does not appear to be active. Question is, how to make active the device again (using mdmadm, I presume)? (Other times it's alright (active) after boot, and I can mount it manually without problems. But it still won't mount automatically even though I have it in /etc/fstab: /dev/md_d0 /opt ext4 defaults 0 0 So a bonus question: what should I do to make the RAID device automatically mount at /opt at boot time?) This is an Ubuntu 9.10 workstation. Background info about my RAID setup in this question.

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• Can I use a Windows Server 2003 Domain Controller but my home router for DNS?

  - by NetworkingWannabie

  Hi All Probably easiest to start with a description of my current setup, which works (oh, and this is a home setup not an office or anything): I have an ADSL modem with a static IP address (192.168.128.1), and its DHCP capability is disabled. I have a permanently powered up Windows Server 2003 machine with a fixed IP (192.168.128.2) which provides my domain controller, dhcp, and dns. The default gateway for everything is my ADSL modem everything is setup to use the WS2003 machine as the primary DNS with the ADSL modem as Secondary DNS just in case the server goes down (everything includes the server itself). Lastly, just in case it's relevant, I have my DHCP leases set to infinite (or whatever the right term is). Everything is pretty hunky dory. Except, that is, for the fact that my server is ALWAYS on, and it isn't always used, so I'm burning juice that I don't need to - my server burns around 120W which isn't immense but isn't irrelevant either, so I'd like to put it into a stand-by state when it isn't being used (the more standby the better) and then get the clients to wake it up. Am I correct in assuming that this won't work at the moment - A given client would need an IP address to wake the machine up, and it needs to machine to be awake to get an IP - catch 22? Assuming I'm correct, can I move to using my router (which is always on) for DHCP? What impact will this have on DC and DNS? Alternatively, does anyone have a better way for me to achieve this? Can I get the server to wake up when it sees clients look for a DHCP server, etc? Wow, that came out longer than expected! Thanks for your help.

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• MySQL Master - Master Broken

  - by Recc

  I've Inherited a Mysql master master system, I've noticed the second master (lets call it slave from now on as it's running on a 'slave' machine) stopped getting its db's updated. I saw that Master: Slave_IO_Running: Yes Slave_SQL_Running: Yes Slave: (with an error I truncated) Slave_IO_Running: Yes Slave_SQL_Running: No Last_Errno: 1062 Last_Error: Error 'Duplicate entry '3' for key 'PRIMARY'' on [...] I don't know what caused it to process considering we cant get duplicate there. What's important is to resume normal operations; Right now I've stop slave; on the Master and stop slave; on the Slave because I saw that if I change records on the Slave the changes Do Get Propagated to Master which is in active use. How do I: Force sync EVERYTHING from master to slave without affecting data on master? Then hopefully have slave pickup replication as usual? UPDATE OK I Tried deleting all tables on slave then it complained in that error section that the 'table' doesnt exist. So i made a no data dump of Master, and made sure I have only empty tables in Secondary (slave). I start slave; on slave BUT now it's complaining about bloody alter table statements for instance: Last_Errno: 1060 Last_Error: Error 'Duplicate column name [...] Query: 'ALTER TABLE [...] How to skip the fracking alter statements I just want to replicate the bloody data and be done with it, my tables have the lates changes already FFS and now its complaining about changes made after the replication seized weeks ago How do I reset the log or something? OUTSTANDING Why would this start happening? The "Secondary" is propagating to "Primary". "Primary" is not propagating to "Secondary". But any fixes I tried to do left it in the same state Yes-Yes Yes-No with same Last_Error. I think around that time the server was taken off the network, could that confuse MySQL in some way?

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• Postfix "loops back to myself" error on relay to another IP address on same machine

  - by Nic Wolff

  I'm trying to relay all mail for one domain "ourdomain.tld" from Postfix running on port 2525 of one interface to another SMTP server running on port 25 of another interface on the same machine. However, when a message is received for that domain, we're getting a "mail for loops back to myself" error. Below are netstat and postconf, the contents of our /etc/postfix/transport file, and the error that Postfix is logging. (The high bytes of each IP address are XXXed out.) Am I missing something obvious? Thanks - # netstat -ln -A inet Proto Recv-Q Send-Q Local Address Foreign Address State ... tcp 0 0 XXX.XXX.138.209:25 0.0.0.0:* LISTEN tcp 0 0 XXX.XXX.138.210:2525 0.0.0.0:* LISTEN # postconf -d | grep mail_version mail_version = 2.8.4 # postconf -n alias_maps = hash:/etc/aliases allow_mail_to_commands = alias,forward bounce_queue_lifetime = 0 command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 default_privs = nobody default_process_limit = 200 html_directory = no inet_interfaces = XXX.XXX.138.210 local_recipient_maps = local_transport = error:local mail delivery is disabled mail_owner = postfix mailbox_size_limit = 0 mailq_path = /usr/bin/mailq manpage_directory = /usr/local/man message_size_limit = 10240000 mydestination = mydomain = ourdomain.tld myhostname = ourdomain.tld mynetworks = XXX.XXX.119.0/24, XXX.XXX.138.0/24, XXX.XXX.136.128/25 myorigin = ourdomain.tld newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = /etc/postfix recipient_delimiter = + relay_domains = ourdomain.tld relay_recipient_maps = sample_directory = /etc/postfix sendmail_path = /usr/sbin/sendmail setgid_group = postdrop smtpd_authorized_verp_clients = $mynetworks smtpd_recipient_limit = 10000 transport_maps = hash:/etc/postfix/transport unknown_local_recipient_reject_code = 450 # cat /etc/postfix/transport ourdomain.tld relay:[XXX.XXX.138.209]:25 # tail -f /var/log/maillog ... Aug 2 23:58:36 va4 postfix/smtp[9846]: 9858A758404: to=<nicwolff@... >, relay=XXX.XXX.138.209[XXX.XXX.138.209]:25, delay=1.1, delays=0.08/0.01/1/0, dsn=5.4.6, status=bounced (mail for [XXX.XXX.138.209]:25 loops back to myself)

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• Unable to browse to apache service, Service is running

  - by Jeff

  Summary I have a very peculiar problem. I am not able to open the "It Works!" page after installing a fresh server with apache. I am able to ssh to the box (from outside the network). Apache seems to be running on my Centos6.4x86_64 box just fine. Nothing useful in /var/logs/httpd/*. What am I missing? The setup I am outside the network right now. The "server" is a VM on my home computer running bridged mode. public ip: A.B.C.D Host: 192.168.1.5 VM: 192.168.1.8 I have a verizon fios router that is forwarding ports 22, 80, and 8888 to the VM. I am able to ssh over port 22, but I am not able to browse to the public URL over port 80. so A.B.C.D:22 is working, but http://A.B.C.D:80 is not. What I've tried nmap to see if it is listening: nmap -sT -O localhost Starting Nmap 5.51 ( http://nmap.org ) at 2013-10-25 11:10 EDT Nmap scan report for localhost (127.0.0.1) Host is up (0.000040s latency). Other addresses for localhost (not scanned): 127.0.0.1 Not shown: 996 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 80/tcp open http 3306/tcp open mysql I tried going to it locally (lynx) and it does work. So, is the problem in my ports?

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• DRBD Replication failure

  - by user62513

  A couple of weeks ago I setup a 2 nodes CRM system with one of the resources managed being MySQL over DRBD. Today for maintenance reasons I restarted both nodes but now they can't connect to each other anymore. DRBD fell out of sync and I followed this guide to get it back connected but it's only able to run successfully on one node. But this strange thing happens: If I crm node standby both nodes and I try: crm node online node0 before crm node online node1, all the CRM resources start successfully but the DRBD partitions are still running in StandAlone state. crm node online node1 beofre crm node online node0, the DRBD resource fails to start, thus causing mysql not to start. If I standby both resources and call crm node online node0 then it times out and prints this error: Running crm node online node0 produces this output after timing out Error setting standby=off (section=nodes, set=<null>): Remote node did not respond Error performing operation: Remote node did not respond Is there anything I'm doing wrong here? An alternative will be just do MySQL replication but I'm not sure how to promote a slave to master when the master database is not available.

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• Solaris 10 invalid ARP requests from 0.0.0.0? Link up/down every hour or 2

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). [mymacaddress]/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) It's being logged every hour. I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. There are some tunable SCTP parameters but it's not something I'm familiar with. Do I have to add changes to /etc/system? Looks like sctp_heartbeat_interval might be what I need to change? If it makes any difference, I have a few solaris zones running on this server, each with their own IP address on a virtual interface. eth0:0, eth0:1, etc. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else? Update: This was happening more frequently but now it seems to be happening roughly every hour or every two hours. It's not consistent. I tried setting setting the link speed and duplex to match the switch port and that seemed to make it stop happening for a few hours but then it started again.

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• How to export SQL Server data from corrupted database (with disk write error)

  - by damitamit

  IT realised there was a disk write error on our production SQL Server 2005 and hence was causing the backups to fail. By the time they had realised this the nightly backup was old, so were not able to just restore the backup on another server. The database is still running and being used constantly. However DBCC CheckDB fails. Also the SQL Server backup task fails, Copy Database fails, Export Data Wizard fails. However it seems all the data can be read from the tables (i.e using bcp etc) Another observation I have made is that the Transaction Log is nearly double the size of the Database. (Does that mean all the changes arent being written to the MDF?) What would be the best plan of attack to get the database to a state where backups are working and the data is safe? Take the database offline and use the MDF/LDF to somehow create the database on another sql server? Export the data from the database using bcp. Create the database (use the Generate Scripts function on the corrupt db to create the schema on the new db) on another sql server and use bcp again to import the data. Some other option that is the right course of action in this situation? The IT manager says the data is safe as if the server fails, the data can be restored from the mdf/ldf. I'm not sure so insisted that we start exporting the data each night as a failsafe (using bcp for example). IT are also having issues on the hardware side of things as supposedly the disk error in on a virtualized disk and can't be rebuilt like a normal raid array (or something like that). Please excuse my use of incorrect terminology and incorrect assumptions on how Sql Server operates. I'm the application developer and have been called to help (as it seems IT know less about SQL Server than I do). Many Thanks, Amit

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• Vista won't boot. BSOD: Page fault in nonpaged area

  - by user31576

  Here's the story: I let Windows Update do the updates it wanted to do, then rebooted the computer. The updating process was taking time so I went away. When I came back, my computer was rebooting. It got as far as the Windows logo with the laoding bar. BSOD'd. Rebooted. And I'm stuck in this loop ever since. Looked up on the net, the "Page fault in nonpaged area" seems to be linked to faulty RAM or drivers. So I ran a memory test, it found no error. When I try in safe mode (with promt) I can see a list of drivers being loaded, then I get the same BSOD. I tried to repair using the Vista DVD, it says "nothing to repair". I tried to restore to a previous state, it says "no restore point found". So, my guess is, it's got something to do with the drivers. How can I identify the one causing the BSOD? If you have any other leads, What can I do? By the way, I'm writing from this very computer, running a linux distro I installed after the BSOD loop started. So i guess it's not an hardware issue. I have backed up important data, and will format and reinstall Windows if I must. But I'd like to avoid that. Thanks in advance for any help you can give me.

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• Upstart multiple instances of service not working

  - by Dax

  I started playing with MongoDB on Lucid. Now I would like to run a DB and Config server on the same box. They both use the same binary to launch, but with different config files and running on different ports. All directories for log and lib is split so one goes to mongodb and the other to mongoconf. Each process can be started without any problems on their own. start mongodb stop mongodb start mongoconf stop mongoconf But if I try to start both, the second one would just start and exit. Using 'initctl log-priority debug' I got the following in the logs. Jan 6 12:44:12 mongo4 init: event_finished: Finished started event Jan 6 12:44:12 mongo4 init: job_process_handler: Ignored event 1 (1) for process 5690 Jan 6 12:44:12 mongo4 init: mongoconf (mongoconf) main process (5690) terminated with status 1 Jan 6 12:44:12 mongo4 init: mongoconf (mongoconf) goal changed from start to stop Jan 6 12:44:12 mongo4 init: mongoconf (mongoconf) state changed from running to stopping man 5 init shows that you can use instance names to differentiate the two. I tried using 'instance mongoconf' in the on upstart script and 'instance mongodb' in the other one, and it still fails. I can manually start the other process, so there is definitely no conflicts on port numbers or directories. Any ideas on what to try or how to get output on why it is 'terminated with status 1'? Thanx

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• Extremely Weird Computer Problem

  - by waiwai933

  Well, having worked with computers a long time, I thought I had seen everything that could go wrong with a computer. Today, I learned that I was wrong. My Mac has been behaving extremely weirdly. While the keyboard is fine, the mouse holds extremely weird behavior. It will open apps from the Dock, but not open documents from a Stack. The top menu bar will work, but only after I restart Finder. I am unable to close most windows, except with Cmd+Q. Clicking on a link in Safari, for some reason, opens it in a new tab. I can not select checkboxes, but I know a click is going through because you can see a quick indent in the check box, before it reverts to the unchecked state. I've restarted my computer, as well. I don't see a virus when looking through top, but I guess it could be subverting top. Does anyone have an idea what is going on?

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• add_header directives in location overwriting add_header directives in server

  - by user64204

  Using nginx 1.2.1 I am able to add multiple headers using add_header as follows: server { listen 80; server_name localhost; root /var/www; add_header Name1 Value1; <=== HERE add_header Name2 Value2; <=== HERE location / { echo "Nginx localhost site"; } } GET / HTTP/1.1 200 OK Name1: Value1 Name2: Value2 However I soon as I use the add_header directive inside location, the other add_header directives under server are ignored server { listen 80; server_name localhost; root /var/www; add_header Name1 Value1; <=== HERE add_header Name2 Value2; <=== HERE location / { add_header Name3 Value3; <=== HERE add_header Name4 Value4; <=== HERE echo "Nginx localhost site"; } } GET / HTTP/1.1 200 OK Name3: Value3 Name4: Value4 The documentation says that both server and location are valid context and doesn't state that using add_header in one prevents using it in the other. Q1: Do you know if this is a bug or the intended behaviour and why? Q2: Do you see other options to get this fixed than using the HttpHeadersMoreModule module?

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• Site hanging in iis7 - how do I troubleshoot?

  - by Chris Foot

  I am currently having a problem with a windows 2008 server running IIS 7. The server runs several sites but only seems to have the issue with one particular site. Every so often, the whole server slows to a crawl with nearly all requests timing out! Invariably, when we log in to take a look there is always an IIS process using up around 90% cpu. Looking into the worker processes in IIS there are usually one or two requests that have been running for a long time. They are always in the ExecuteRequestHandler state with ManagedPipeline as the module name and the current ones i'm looking at have been running for 7686248 (what units is this in, it doesn't say?). It is also not always the same page, in fact we have seen at least 3 different pages listed under url when this has happened. It seems that the only way to bring the server back to life is to kill the 90% process! The site is running under .Net 4.0 and the code on it is very similar to other sites on the server which do not have the problem! How do I start troubleshooting this?

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• EMC VNX iSCSI setup - unsure about SP/port assignment

  - by pauska

  We have a new VNX5300 waiting to get configured, and I need to plan out the network infrastructure before the EMC tech arrives. It has 4x1gbit iSCSI per SP (8 ports in total), and I'd like to get the most out of the performance until we jump over to 10gig iSCSI. From what I can read from the docs - the recommendation is to use only two ports per SP, with 1 active and 1 passive. Why is this? It seems kind of pointless to have quad-port i/o-modules and then recommend to not use more than two of them? Also - I'm a bit unsure about the zoning. The best practices guide state that you should separate each port on each SP from each other on different logical networks. Does this mean that I have to create 4 logical networks to be able to use all 8 ports? It also gives the following example: Does this mean that A0 and B0 should sit on the same physical switch aswell? Won't this make all traffic go on one switch (if both A1 and B1 are passive)? Edit: Another brainpuzzle I don't get it - each host (as in server) should not have more iSCSI bandwidth available than the storage processor. What on earth does this matter? If serverA have 1gbit and serverB have 100mbit, then the resulting bandwith between them is 100mbit. How can this result in some kind of oversubscription? Edit4: Wait, what. Active and passive ports? The VNX runs in a ALUA configuration with asymmetrical active/active.. there shouldn't be any passive ports, only preferred ones..

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• How does one skip "Windows did not shut down successfully" in Win7-64?

  - by XenonofArcticus

  Migrating an app from an expensive and unreliable dedicated embedded x86 box running WinXP-embedded to COTS hardware (Dell E6410 laptop) running normal Win7-64. At this time, it's not feasible to deploy using Windows 7 embedded. The problem is, that the system is still sort of "embedded". The power could shut off at virtually any time without prior warning. We've stripped the OS down and removed the battery capability so that it will power down as desired. The app never writes to the disk, so it's not like we're going to corrupt anything terribly. The system is essentially idle after our app is up and running (with the exception of some computation, graphics, and TCP/IP and serial communications) so the OS enters a pretty stable state rather quickly. After a power-loss however, it rightly complains that Windows did not shut down successfully and presents the user with the Windows Error Recovery text screen. If left alone, it does eventually move on booting just fine, but we'd like to skip that step if possible. WinXP-embedded is designed to do this automatically, so I know it's possible. I've looked at the Kernel Switches but I didn't see anything documented for "Skip Windows Error Recovery". I've also read extensively on the startup process: http://homepage.ntlworld.com./jonathan.deboynepollard/FGA/windows-nt-6-boot-process.html I know I can disable the auto chkdsk in the registry, but that's not the same thing either. So, how do I streamline the boot process to not hassle the user about a situation that will be the regular normal situation?

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• How do I diagnose the cause of a freeze after resuming in Windows XP (SP3)?

  - by Software Monkey

  I have just built a new computer from parts. Whenever I resume from any sleep mode (S1, S3 or S4) the computer freezes within about 60 seconds of the welcome screen appearing. I have updated the BIOS and all drivers to current from the motherboard manufacturer's site. I have reset BIOS settings to default, including disabling AMD Cool n Quiet. The windows event logs are not helpful at all. Other than immediately after resuming the system is stable as long as AMD CnQ is disabled. The system is: Mobo : MSI 790GX-G65 CPU : AMD Phenom II 965 BE at 3.6 GHz Memory : Corsair DDR3 1600, at 1333 MHz and 9-9-9-21 HDDs : 1 EIDE, 2 SATA in RAID-0 DVD : 1 Card Reader: 1 multi-card reader Keyboard is attached via PS2 and mouse is USB. Any thoughts or pointers would be most welcome. EDIT: It appears that the computer may not freeze if a program is left running which puts it under significant load. I left a stress test running which keeps all cores under 85% load, and my son put the computer to sleep - while this program is running it I have been able to resume from S3 successfully 4 times, compared against about 20 tests with the computer idle which have all frozen. So this may be related to being in an idle state when it resumes.

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