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• Apache is reponding a blank white page

  - by Bruno Araujo

  I have the following situation: A site hosted in apache 2.4, with ssl, that works like a charm for a while now, but out of no where, without modifications to the site, apache started serving random blank pages. The workaround this is to delete the cookies of the browser or restart the browser. I've switched the vitualhost to log in debug mode but it didn't got me anywhere. Here is the debug log of a failed page load: [Wed Oct 24 10:57:35.762547 2012] [ssl:info] [pid 27854:tid 140617706374912] [client 192.168.10.150:58917] AH01964: Connection to child 147 established (server xxx.com.br:443) [Wed Oct 24 10:57:35.762739 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_kernel.c(1966): [client 192.168.10.150:58917] AH02043: SSL virtual host for servername xxx.com.br found [Wed Oct 24 10:57:35.777479 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_kernel.c(1899): [client 192.168.10.150:58917] AH02041: Protocol: TLSv1, Cipher: DHE-RSA-AES256-SHA (256/256 bits) [Wed Oct 24 10:57:35.779912 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_kernel.c(243): [client 192.168.10.150:58917] AH02034: Initial (No.1) HTTPS request received for child 147 (server xxx.com.br:443) [Wed Oct 24 10:57:35.780044 2012] [authz_core:debug] [pid 27854:tid 140617706374912] mod_authz_core.c(809): [client 192.168.10.150:58917] AH01628: authorization result: granted (no directives) [Wed Oct 24 10:57:40.783950 2012] [ssl:info] [pid 27854:tid 140617706374912] (70007)The timeout specified has expired: [client 192.168.10.150:58917] AH01991: SSL input filter read failed. [Wed Oct 24 10:57:40.784077 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_io.c(988): [remote 192.168.10.150:58917] AH02001: Connection closed to child 147 with standard shutdown (server xxx.com.br:443)

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• iSCSI, failover and XenServer

  - by jemmille

  I have an iSCSI fail over implementation setup so if one of my storage units fails the other takes over immediately (it also runs the NFS shares). When fail over occurs, volumes are exported, the IP is switched to the other machine and the targets are reconfigured. The fail over of the storage system itself works just fine. I use NexentaStor for my filer. When I do a test (manual) fail over of my storage the following occurs: Note: I run the admin VM's on NFS and customer based VM's on iSCSI All NFS based VM's remain up and working perfectly through the failover and after All VM 's running on iSCSI eventually report the following: An error about not being able to write to a particular block An error about journaling not working Then the file system goes RO To get the VM's working again I have to do the following: Force shutdown of the "broken" VM's. Detach the iSCSI SR Re-attach the iSCSI SR Boot the VM on a different server (5 in my pool) If I don't boot on a different server I get this error "Internal error: Failure("The VDI <uuid&gt; is already attached in RW mode; it can't be attached in RO mode!")" The only way I have found to fix that error is to reboot the entire server it was running on previously which is obviously a huge pain. Currently multipathing is NOT enabled (but can be and the same thing still occurs). I have edited much of the /etc/iscsid.conf file to work with the timeout settings but to no avail. In short, my storage fails over properly but XenServer does not keep the connection alive. As a thought, the error that shows up in #4 above might be the ultimate cause and fixing that would fix everything? Any help would be appreciated more than you know.

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• Issues with doing a P2V on Exchange 2007

  - by PokermUNKEE

  I shutdown all Exchange services on the physical box and did a convert. Everything converted fine. Server booted up no issues and I could receive email from the outside world with no issues. But I am unable to send emails internally or externally. They just sit in the Outbox. I also disabled the DHCPClient service as I didn't want the server to get an IP address from DHCP when it first came online. It came online with no IP, then I used console to assign the correct static IP address (same one on the physical server) and rebooted. I ran the Exchange Troubleshooting Agent and it gave me the following errors: The value for the '\MSExchangeIS Mailbox\Messages Queued For Submission' counter on server exchange is greater than zero (average value is 8.8) and it appears that 'MSExchangeMailSubmission' is failing to submit messages to at least one computer with the Hub Transport server role installed over the last minute. Found 1 computers with the Hub Transport server role installed in the same Active Directory site as server exchange using local Active Directory site GUID 'ce8a4367-1bf6-4825-9cac-c4e2b115c450'. Check Local Active Directory Site Hub Transport Server Role Health (Mailflow_CheckLocalBhHealth1.1.1.1.1.1.1.1) I have one Exchange server with all the roles on it. Has anyone see this before when doing a convert? Please help :(

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• Sending USR2 to mongrel_rails sometimes results in an “Address already in use” on the restart

  - by Ben

  We have a rolling-restart mode for our mongrel cluster that sends a USR2 signal to each running process. This works great, most of the time. But very occasionally the mongrel process will shutdown, and then fail to restart, with the following error: /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/tcphack.rb:12:in `initialize_without_backlog': Address already in use - bind(2) (Errno::EADDRINUSE) from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/tcphack.rb:12:in `initialize' from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:93:in `new' from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:93:in `initialize' from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:139:in `new' from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:139:in `listener' Looking though the mongrel source, the USR2 handler calls a synchronous stop on the running server, so it ought to block until the socket has been released. Has anyone seen this error? Does anyone have any ideas what might cause it? (I asked this question over on StackOverflow initially, but thought it might be more appropriate here)

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• How can I resolve Oracle 11g XE connection failure straight after installation?

  - by d3vid

  I have just installed Oracle 11g XE on a Windows 7 VirtualBox VM, using all the default options. "Getting Started" fails When I click on Getting Started I get taken to http://127.0.0.1:8080/apex/f?p=4950 which fails. After some browsing I came across a suggestion to confirm the HTTP port, but I can't get this far, because I can't connect. connect system fails If I select Run SQL command line I get taken to a SQL prompt. I enter connect system and get prompted for a password. I enter the password. I immediately get the following error: ERROR: ORA-01033: ORACLE initialization or shutdown in progress Process ID: 0 Session ID: 0 Serial number: 0 Info: Start database This happens whether or not I run Start database first. (Start database just opens a Windows command prompt window.) Info: Windows services My Oracle services start as follows: Starting the manual services doesn't resolve the problem. Enabling and starting the disabled service doesn't resolve the problem. Is there something I haven't done? How can I resolve this connection error?

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• Vagrant ssh fails with VirtualBox

  - by lukewm

  vagrant up fails when it gets to the ssh part: myterminal$ vagrant up [default] VM already created. Booting if its not already running... [default] Running any VM customizations... [default] Clearing any previously set forwarded ports... [default] Forwarding ports... [default] -- ssh: 22 => 2222 (adapter 1) [default] -- db2: 30003 => 30003 (adapter 1) [default] Cleaning previously set shared folders... [default] Creating shared folders metadata... [default] Booting VM... [default] Waiting for VM to boot. This can take a few minutes. [default] Failed to connect to VM! Failed to connect to VM via SSH. Please verify the VM successfully booted by looking at the VirtualBox GUI. Then when I subsequently try and connect using vagrant ssh or vagrant reload or similar, I get this: myterminal$ vagrant reload [default] Attempting graceful shutdown of linux... SSH connection was refused! This usually happens if the VM failed to boot properly. Some steps to try to fix this: First, try reloading your VM with `vagrant reload`, since a simple restart sometimes fixes things. If that doesn't work, destroy your VM and recreate it with a `vagrant destroy` followed by a `vagrant up`. If that doesn't work, contact a Vagrant maintainer (support channels listed on the website) for more assistance. Please help! I'm really stumped. Kind regards, Luke

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• Auto load balancing two node Cluster Hyper-v 2008 R2 enterprise?

  - by Kristofer O

  My setup is a 2 node cluster with 72GB ram each and a ~10TB MD3000i Iscsi SAN. I have about 30VMs running I keep about 15 on either server. I do a live migration to the other server if I need to run updates or whatever... Either one of the servers is able of running all VM if needed, but the cpu is pretty high. Here's my issues. I know Hyper-v has a limit of a single Live-migration at a time. But Why doesn't it queue them up to move one at a time? If I multi select I don't get the option to live migrate a one at a time. OR if I'm in the process of Migrating one it will give me an error that it's currently migrating a VM... Is there a button I missed that will tell a Node that it needs to migrate all the VMs elsewhere? Another question, does anyone know whats the best way to load balance VMs based on CPU and/or network utilzation. I have some VMs that don't do much. and some that trash the CPU or network. I'd like to balance it out on both servers if at all possible. and Is there any way to automate it? last question... If I overcommit my Cluster is there a way to tell the cluster that I want certian VMs the be running and to savestate other VMs based on availible system resources? Say when my one node blue screens and the other node begins starting the VMs up. I want the unimportant ones to shutdown or savestate so the important ones can stay running or come back online. Thanks just for reading all that. Any help would be great.

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• kvm works only when kvm-intel is unloaded

  - by Sathya

  I am new to kvm. I have this strange issue. But before explaining the issue, here is my set up. I try to install VM on my Host which is a Acer Laptop 5720 Has T7500 Intel processor. The cpu flags indicate that Virtualization is supported. I run Ubuntu 10.04 (lucid) on it. It comes with kvm. Now coming to the issue - I dont get any errors while executing "sudo modprobe kvm-intel". So I presume my processor does indeed support hardware virtualization. I use virt-manager and create a VM on which I install ubuntu from an *.iso file. When I start the VM it says it is running. No signs of any trouble. I can see the domain list in "virsh list". But when I try to connect to the VM thru VNC, all I get to see is a blank screen (no cursor). There is no response to any key press. I changed the video mode etc. Tried all different combinations but none work. But strangely, if I shutdown the vm an virt-manager and then unload the module by doing "sudo modprove -r kvm-intel", everything works fine. ie., I can see the screen via VNC. I am able to install the OS and so on. So what does this mean ? IS hardware virtualization not supported ? How come there is no error anywhere ? dmesg | grep kvm doesnt report anything. Can someone throw light on what excatly is happening ?

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• How to configure Hyper-V failover cluster to live migrate when dynamic memory runs out?

  - by Matt Johnson

  Appologies in advance that this is not a direct programming question, but I have a feeling that the solution involves custom powershell scripts (maybe), so this is as good a place to ask as any. I maintain a website that has a large Hyper-V cluster for SQL Servers. We are using Windows 2008 R2 SP1, and the new "dynamic memory" feature. I've already ready reviewed the Best Practices Guide, and implemented it's suggested configuration. Everything works well, except that when SQL demand increases memory pressure to expand to more memory than is available on the physical machine, the memory status goes into the "Warning" state and stays there. I assume the hypervisor is using a swapfile on the host to fulfill the memory requirement, thus slowing the virtual machine down. When this happens, there are plenty of other nodes in the cluster that have available resources. I can live-migrate the virtual server over there and everything works, and the warnings go away. Now how can I automate this? I see no menu options in either Hyper-V or the Failover Cluster Manager for performing a migration or shutdown when dynamic memory goes into the warning state. Any ideas about how to script this, or monitor it and invoke the action directly, would be helpful. If the solution involves coding, powershell would be ideal, but I could envison this as a .Net Service that monitors for this state and kicks off the migration request. I just don't know what objects are involved in doing the monitoring or kicking off the live migration. Thanks in advance.

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• MySQL socket connections working, but not port connections

  - by Neil

  I installed MySQL community 5.1.45 on my Snow Leopard 10.6, using the pkg from their site. I had previously installed a MySQL binary from entropy.ch. In the previous installation, the connections were working fine before I upgrade to Snow Leopard. In Snow Leopard, both the installations are problematic. Using an app called Sequel Pro, if I connect with the socket operation, it connects properly. However, a standard connection with the same credentials doesn't work. From what I've understood, socket connections happen on the machine itself between processes, whereas normal connections occur over the network/ports, in this case a loopback to my machine, since the server and client are both on the same machine. My new CakePHP installation isn't being able to connect to the db with the root credentials I provided. Btw, I've been starting the MySQL server using the Preference Pane. When I tried running mysqld from terminal, it gave me: 100323 1:54:37 [Warning] Can't create test file /usr/local/mysql-5.1.45-osx10.6-x86_64/data/mbp.lower-test 100323 1:54:37 [Warning] Can't create test file /usr/local/mysql-5.1.45-osx10.6-x86_64/data/mbp.lower-test mysqld: Can't change dir to '/usr/local/mysql-5.1.45-osx10.6-x86_64/data/' (Errcode: 13) 100323 1:54:37 [ERROR] Aborting 100323 1:54:37 [Note] mysqld: Shutdown complete mbp is the name of my machine. How do I fix this so that my webserver can connect to the mysql server?

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• SQL Server instance shuts down

  - by user42119

  I'm currently developing a new ASP.NET project hosted on a Windows Server 2008 RC2 with an SQL Server 2008 Express database. I have three SQL Server instances (for different purposes) running which currently all contain a single database. For apparently no reason, these instances tend to shut down after some days. There might be low or no traffic to these instances, because there might be some days in a row, where I can't develop. It now occurred several times, that one or two of these three instances just shut down, so that I can't access the database, without manually starting the instance. I can't seem to find a event log entry for the shutdown, which is most likely because I just enabled logging (why is the default setting off?). So the questions are: * Why does an SQL Server instance shut down? (Is there such a thing as a "Shut down instance after 3 days of inactivity"? * How can I achieve that the instances are running 24/7? Edit: I solved this problem by writing my own application that checks for the status of the SQL Server services. My program will start via a batch file, that gets called by the Windows Task Scheduler every 5 minutes.

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• Accidently overwrote system.dbf - What now?

  - by Filip Ekberg

  I accidentally overwrote system.dbf in /usr/lib/oracle/xe/oradata/XE/system.dbf Well I did not actually do it accidentally, however I overwrote it because of other failures in the database. And when I try running the following: SQL> shutdown ORA-01109: database not open Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. Total System Global Area 289406976 bytes Fixed Size 1258488 bytes Variable Size 92277768 bytes Database Buffers 192937984 bytes Redo Buffers 2932736 bytes Database mounted. ORA-01589: must use RESETLOGS or NORESETLOGS option for database open Now I want to try to Recover the database because starting it in mounted or standard surely doesn't work. SQL> recover database using backup controlfile; ORA-00283: recovery session canceled due to errors ORA-01110: data file 1: '/usr/lib/oracle/xe/oradata/XE/system.dbf' ORA-01122: database file 1 failed verification check ORA-01110: data file 1: '/usr/lib/oracle/xe/oradata/XE/system.dbf' ORA-01206: file is not part of this database - wrong database id How do I solve this? Is it even possible? My "real" problem was that I ran the /etc/init.d/oracle-xe configure and it overwrote my old configuration and probably removed passwords and such so my tables were gone, however I found the mytablespace.dbf so I hope that it is possible to recover? Please shed some light on this.

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• Experience with AMCC 3ware 9650se raid cards? Ours seems dead

  - by antiduh

  We have a 8-port 3ware 9650se raid card for our main disk array. We had to bring the server down for a pending power outage, and when we turned the machine back on, the raid card never started. This card has been in service for a couple years without problems, and was working up until the shutdown. Now, when we turn the machine on, the bios option rom that normally kicks in before the bootloader doesn't show up, none of the drives start, and when the OS tries to access the device, it just times out. The firmware on it has been upgraded in the past, so it's possible we've hit some sort of firmware bug. We're using it in a Silicon Mechanics R272 machine with gentoo for the OS. The OS eventually boots, but alas, without the card. We've ordered a new one, but I'm worried that if we replace the card it won't recognize the existing array. Has anybody performed a card swap before? Any help would be greatly appreciated. Edit: These are the kernel errors we see: 3ware 9000 Storage Controller device driver for Linux v2.26.02.012. 3w-9xxx 0000:09:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 3w-9xxx 0000:09:00.0: setting latency timer to 64 3w-9xxx: scsi0: ERROR: (0x06:0x000D): PCI Abort: clearing. 3w-9xxx: scsi0: ERROR: (0x06:0x001F): Microcontroller not ready during reset sequence. 3w-9xxx: scsi0: ERROR: (0x06:0x0036): Response queue (large) empty failed during reset sequence. 3w-9xxx 0000:09:00.0: PCI INT A disabled

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• port forwarding with VirtualBox

  - by Argh

  I have a virtualbox VM running ubuntu. The Ubuntu guest is running a web server which listens on port 3000 (http://127.0.0.1:3000) The host machine is windows vista. I have configured port forwarding using VBoxManage. If I query the config using VboxManage getextradata "MyMachine", I get Key: GUI/AutoresizeGuest, Value: on Key: GUI/Fullscreen, Value: off Key: GUI/LastCloseAction, Value: shutdown Key: GUI/LastWindowPostion, Value: 9,34,640,529,max Key: GUI/MiniToolBarAlignment, Value: bottom Key: GUI/MiniToolBarAutoHide, Value: off Key: GUI/SaveMountedAtRuntime, Value: yes Key: GUI/Seamless, Value: off Key: GUI/ShowMiniToolBar, Value: yes Key: VBoxInternal/Devices/pcnet/0/LUN#0/Config/guesthttp/GuestPort, Value: 3000 Key: VBoxInternal/Devices/pcnet/0/LUN#0/Config/guesthttp/HostPort, Value: 3000 Key: VBoxInternal/Devices/pcnet/0/LUN#0/Config/guesthttp/Protocol, Value: TCP This looks like it should work... However when I try to access the web server from the host machine (windows box) I dont get a response. I ran a netstat on the windows box and nothing appears to be listening on port 3000 which explains why forwrding isnt working. Note that I have already tested with my firewall switched off... The version of VirtualBox I am using is 3.1.4 Any ideas?

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• What DBus signal is sent on system suspend?

  - by Paul Robinson

  Hello, I need to detect when a machine is going to sleep in Ubuntu 9.10 and Fedora 13. Both use UPower, so I've been looking on the "org.freedesktop.UPower" DBus bus for such signals. I've been listening for the "sleeping" signal on the UPower bus with the following command: dbus-monitor --system "type='signal',interface='org.freedesktop.UPower',member='Sleeping'" When I sleep the machine (either by closing the lid, selecting "shutdown - suspend" or sending a DBus message) I don't see a "sleeping" event. I notice that the "Sleeping" event is sent when the "org.freedesktop.UPower.AboutToSleep" method is invoked. I can do this manually by calling: dbus-send --print-reply --system --dest=org.freedesktop.UPower /org/freedesktop/UPower org.freedesktop.UPower.AboutToSleep And I notice the "sleeping" signal is fired. My understanding is that anything that sleeps the PC must send the "AboutToSleep" signal before hand. It doesn't seem like this is happening. I've tried these steps on both Fedora 13 and Ubuntu 9.10 and I see the same results. Can anyone explain what's happening or provide me with an alternative DBus signal to listen for? Many thanks, Paul

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• ASUS P8B WS - Endless Reboots

  - by tuxGurl

  I am running a Intel XEON 1245 with 4GBx2 Kingston Memory ECC Unbuffered DDR3 on an ASUS P8B WS motherboard. BIOS Version 0904 x64. This system is a little over a month old. It is running Ubuntu 11.10. This evening I found the machine turned off. When I tried to restart it, it would POST and stop at the GRUB screen. When I selected Ubuntu and hit enter within 2-3 seconds the would shutdown and restart. If I stayed at the GRUB screen and did nothing the system would not cut out. I tried booting off a USB stick and again 2-3 seconds after selecting 'Try Ubuntu without Installing' the machine will cut power and reboot. Things I have tried so far: Resetting the BIOS using the on board jumper Resetting the BIOS settings to default Disconnecting all external hardware - except keyboard & monitor Booting with 1 stick of RAM - I tried different single sticks Ensured that onboard EPU and GPU boost switches are in the off position. I am running a Memtest86 right now and it has been running for 38+ minutes. This is not an OS problem or an overheating issue (I have a CoolerMaster HAF Case with 3 fans besides the CPU fan) I am at a loss as to what to try next. I think the BIOS is mis-configured somehow but I don't know what to look for.

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• How can I get MySQL 5.5 to log warnings to one of the log files?

  - by Wodin

  I have found various things that say that you can log warnings to the MySQL error log, but I have not been able to actually make it happen. I do have the error log working, and MySQL prints stuff to it on startup and shutdown and occasionally at other times, but if I e.g. SELECT CAST('123' AS DATE); and then SHOW WARNINGS; I can see the warning, but it does not show up in any logs. I've also tried enabling the general log and the slow query log, but these don't show the warnings either. I've tried with log_warnings = 1 and log_warnings = 2, but still no warnings are logged. What am I doing wrong? mysql> show variables like '%error%'; +--------------------+--------------------------+ | Variable_name | Value | +--------------------+--------------------------+ | error_count | 0 | | log_error | /var/log/mysql/mysql.err | | max_connect_errors | 10 | | max_error_count | 1024 | | slave_skip_errors | OFF | +--------------------+--------------------------+ mysql> show variables like '%warn%'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | log_warnings | 1 | | sql_warnings | OFF | | warning_count | 0 | +---------------+-------+ 3 rows in set (0.06 sec) mysql> show variables like '%log%'; +-----------------------------------------+-------------------------------+ | Variable_name | Value | +-----------------------------------------+-------------------------------+ ... | general_log | ON | | general_log_file | /var/log/mysql/general.log | ... | log | ON | ... | log_error | /var/log/mysql/mysql.err | | log_output | FILE | | log_queries_not_using_indexes | ON | ... | log_warnings | 1 | ... | slow_query_log | ON | | slow_query_log_file | /var/log/mysql/mysql-slow.log | ... +-----------------------------------------+-------------------------------+ Edit: mysql> show global status like 'Aborted%'; +------------------+-------+ | Variable_name | Value | +------------------+-------+ | Aborted_clients | 24 | | Aborted_connects | 15 | +------------------+-------+ 2 rows in set (0.08 sec) Edit: Clarification: I do get [Warning] Aborted connection 1 to db... and [Warning] Access denied for user... messages logged, but not the warnings that you can see via SHOW WARNINGS after e.g. inserting something or running LOAD DATA INFILE... which is what I'm looking for.

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• upstart config to start sync daemon as non-root user

  - by Rudiger Wolf

  I am planning to use inosync to sync data from master server to several client servers. I have created a user called rsyncuser in both master and slaves with access permissions and passwordless ssh access from master to slave servers. Inosync is working when I use it from the command line as rsyncuser. Next I want this to start automatically when server is turned on. I figured upstart is the way to get this working. I am unable to find the right upstart command to get this working. Here is my upstart conf file. The problem seems to be around running "inosync -d -c /etc/inosync/inosync_rsyncuser.py" as a given user. As you can see I have tried a number of various options! description "start inosync to sync data to other CDN Servers as rsyncuser" console output #start on startup #stop on shutdown start on (net-device-up and local-filesystems) stop on runlevel [016] #start on runlevel [2345] #stop on runlevel [!2345] #kill timeout 30 env RUN_AS_USER=rsyncuser expect fork script echo "Inosync updtart job seems to have started" /tmp/upstart.log # exec sudo -u rsyncuser -c "ls -la" /tmp/upstart.log 2&1 # LOGFILE=/var/log/logfile.`date +%Y-%m-%d`.log # exec su - $RUN_AS_USER -c "inosync -d -c /etc/inosync/inosync_rsyncuser.py" $LOGFILE 2&1 # exec su -c "ls -la" /tmp/upstart.log 2&1 # emit inosync_running end script

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• iSCSI, failover and XenServer

  - by jemmille

  I have an iSCSI fail over implementation setup so if one of my storage units fails the other takes over immediately (it also runs the NFS shares). When fail over occurs, volumes are exported, the IP is switched to the other machine and the targets are reconfigured. The fail over of the storage system itself works just fine. I use NexentaStor for my filer. When I do a test (manual) fail over of my storage the following occurs: Note: I run the admin VM's on NFS and customer based VM's on iSCSI All NFS based VM's remain up and working perfectly through the failover and after All VM 's running on iSCSI eventually report the following: An error about not being able to write to a particular block An error about journaling not working Then the file system goes RO To get the VM's working again I have to do the following: Force shutdown of the "broken" VM's. Detach the iSCSI SR Re-attach the iSCSI SR Boot the VM on a different server (5 in my pool) If I don't boot on a different server I get this error "Internal error: Failure("The VDI <uuid&gt; is already attached in RW mode; it can't be attached in RO mode!")" The only way I have found to fix that error is to reboot the entire server it was running on previously which is obviously a huge pain. Currently multipathing is NOT enabled (but can be and the same thing still occurs). I have edited much of the /etc/iscsid.conf file to work with the timeout settings but to no avail. In short, my storage fails over properly but XenServer does not keep the connection alive. As a thought, the error that shows up in #4 above might be the ultimate cause and fixing that would fix everything? Any help would be appreciated more than you know.

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• Resize Debian in VirtualBox

  - by Poni

  I have a VM with one HD of size 3GB and I'd like to enlarge its HD to 7GB. So I execute this command on the host (while guest is shutdown): VBoxManage modifyhd debian.vdi --resize 7168 Then I run the guest, Debian 6, and then: smith@debian6:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 2.8G 2.6G 60M 98% / tmpfs 61M 0 61M 0% /lib/init/rw udev 57M 160K 57M 1% /dev tmpfs 61M 0 61M 0% /dev/shm smith@debian6:~$ sudo parted /dev/sda print Model: ATA VBOX HARDDISK (scsi) Disk /dev/sda: 3221MB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 3035MB 3034MB primary ext3 boot 2 3036MB 3220MB 185MB extended 5 3036MB 3220MB 185MB logical linux-swap(v1) smith@debian6:~$ cat /proc/partitions major minor #blocks name 8 0 3145728 sda 8 1 2962432 sda1 8 2 1 sda2 8 5 180224 sda5 So, no automatic resizing (detection) of the HD/partition (while VirtualBox, in the host, shows it's 7GB now). Ok... Then I do: smith@debian6:~$ sudo resize2fs /dev/sda1 resize2fs 1.41.12 (17-May-2010) The filesystem is already 740608 blocks long. Nothing to do! smith@debian6:~$ sudo parted GNU Parted 2.3 Using /dev/sda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) select /dev/sda1 Using /dev/sda1 (parted) resize WARNING: you are attempting to use parted to operate on (resize) a file system. parted's file system manipulation code is not as robust as what you'll find in dedicated, file-system-specific packages like e2fsprogs. We recommend you use parted only to manipulate partition tables, whenever possible. Support for performing most operations on most types of file systems will be removed in an upcoming release. Partition number? 1 Start? 0 End? [3034MB]? Here I'm stuck. At the above parted it asks me to resize to 3GB. No point in that, right.. What should I do in order to enlarge this partition?

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• General logging won't work in MySQL

  - by leonstr

  I saw on SF that there's an option in MySQL to log all queries. So, in my version (mysql-server-5.0.45-7.el5 on CentOS 5.2) this appears to be a case of enabling the 'log' option, so I edited /etc/my.cnf to add this: [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql old_passwords= log=/var/log/mysql-general.log [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid I then created the file and set permissions: # touch /var/log/mysql-general.log # chown mysql. /var/log/mysql-general.log # ls -l /var/log/mysql-general.log -rw-r--r-- 1 mysql mysql 0 Jan 18 15:22 /var/log/mysql-general.log But when I start mysqld I get: 120118 15:24:18 mysqld started ^G/usr/libexec/mysqld: File '/var/log/mysql-general.log' not found (Errcode: 13) 120118 15:24:18 [ERROR] Could not use /var/log/mysql-general.log for logging (error 13). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it. 120118 15:24:18 InnoDB: Started; log sequence number 0 182917764 120118 15:24:18 [Note] /usr/libexec/mysqld: ready for connections. Can anyone suggest why this isn't working?

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• Virtual Machines and Automatic Software Updates

  - by Zian Choy

  It's obvious that one's main computer should always be have all the latest security patches and most people don't blink an eye when Microsoft Update installs non-security updates. In the land of virtual machines, I've run into 2 problems with automatic updates: The virtual machines are only run when needed. Only Windows virtual machines seem to patch themselves. To elaborate on #1, I generally make a virtual machine with a purpose in mind. For example, when I needed an old copy of Internet Explorer to reproduce a bug in RSS Bandit, I had a Virtual PC named RSS Bandit. The machine only stayed running for a few minutes at a time. Consequently, there is no downtime for the machine to download updates at 3 AM. To elaborate on #2, I've noticed that if I haven't run a Windows virtual machine in a while, then the moment I log in, the computer frantically downloads updates and within seconds, if I click the Start button, there is a little orange shield next to the "Shutdown" button. However, I ran a freshly created Ubuntu VM for several hours today with hundreds of updates pending and it seemed to never download any of them or install any of them. Is there any reason to be concerned about running VMs with dozens of security holes? If I should be concerned, then is there any way to get Ubuntu to download and install updates rather than just advertising a long list of updates to download next century? I've already tried telling Ubuntu to automatically download and install updates.

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• What should I do to make sure that IIS does not recycle my application?

  - by AngryHacker

  I have a WCF service app hosted in IIS. On startup, it goes and fetches a really expensive (in terms of time and cpu) resource to use as local cache. Unfortunately, IIS seems to recycle the process on a fairly regular basis. So I am trying to change the settings on the Application Pool to make sure that IIS does not recycle the application. So far, I've change the following: Limit Interval under CPU from 5 to 0. Idle Time-out under Process Model from 20 to 0. Regular Time Interval under Recycling from 1740 to 0. Will this be enough? And I have specific questions about the items I changed: What specifically does Limit Interval setting under CPU mean? Does it mean that if a certain CPU usage is exceeded, the application pool will be recycled? What exactly does "recycled" mean? Is the application completely torn down and started up again? What is the difference between "Worker Process shutdown" and "Application Pool recycling"? The documentation for the Idle Time-out under Process Model talks about shutting down the worker process. While the docs for Regular Time Interval under Recycling talk about application pool recycling. I don't quite grok the difference between the two. I thought the w3wp.exe is the worker process which runs the application pool. Can someone explain the difference to the application between the two? The reason for having IIS7 and IIS7.5 tags is because the app will run in both and hope the answers are the same between the versions. Image for reference:

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• Route forwarded traffic through eth0 but local traffic through tun0

  - by Ross Patterson

  I have a Ubuntu 12.04/Zentyal 2.3 server configured with WAN NATed on eth0, local interfaces eth1 and wlan0 bridged on br1 on which DHCP runs, and an OpenVPN connection on tun0. I only need the VPN for some things running on the gateway itself and I need to make sure that everything running on the gateway goes through the VPNs tun0. root:~# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default gw... 0.0.0.0 UG 100 0 0 eth0 link-local * 255.255.0.0 U 1000 0 0 br1 192.168.1.0 * 255.255.255.0 U 0 0 0 br1 A.B.C.0 * 255.255.255.0 U 0 0 0 eth0 root:~# ip route 169.254.0.0/16 dev br1 scope link metric 1000 192.168.1.0/24 dev br1 proto kernel scope link src 192.168.1.1 A.B.C.0/24 dev eth0 proto kernel scope link src A.B.C.186 root:~# ip route show table main 169.254.0.0/16 dev br1 scope link metric 1000 192.168.1.0/24 dev br1 proto kernel scope link src 192.168.1.1 A.B.C.0/24 dev eth0 proto kernel scope link src A.B.C.D root:~# ip route show table default default via A.B.C.1 dev eth0 How can I configure routing (or otherwise) such that all forwarded traffic for other hosts on the LAN goes through eth0 but all traffic for the gateway itself goes through the VPN on tun0? Also, since the OpenVPN client changes routing on startup/shutdown, how can I make sure that everything running on the gateway itself loses all network access if the VPN goes down and never goes out eth0.

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• Create Windows AMI with instance storage

  - by Jonathan Oliver

  I have a business use case and workflow where local/instance/ephemeral storage for an EC2 instance is ideal. Unfortunately I'm coupled to a Windows platform for this particular task and the EC2 Windows offering appears to have some deficiencies related to AMI creation. In essence, I'm trying to figure out if there's a way to attach local instance storage to a Windows EC2 instance using the typical command line interface (because the Amazon Website GUI doesn't support it) and then to somehow create an AMI based upon that. I've tried creating a snapshot and then creating a Windows AMI based upon the snapshot, but of course the docs say this is unsupported and makes an unbootable AMI. In short, here's what I'm trying to do: Be able to run a Windows instance (EBS/S3 instance doesn't matter) Attach local instance storage as drive D: Persist that configuration as an AMI such that I can start lots of them as necessary from either the GUI, command line, or REST API. Be able to take a launched instance, update software, shutdown, and create another AMI based upon that. Wash, rinse, repeat. One other potential option which isn't horrible, but isn't ideal is to create an AMI which has 2 EBS volumes already attached (system+apps and data). Essentially, every time I startup an instance based upon the AMI it'll create 2 new EBS volumes of pre-determined size. I'm trying to avoid that scenario if possible.

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