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• (simple) linux HA with vmware vsphere?

  - by derhelge

  I hope my upcoming question is specific enough, and you are able and willing to support :-) We have several openSUSE VMs in an ESX-Cluster (three ESX-Servers) with an attached iSCSI-SAN. All of those Linux VMs are "single point of failure"-configured, which means in the case of a Web-Server: LAMP, storage, etc. everything on this machine. This was very simple and in case of a failure (in the last years: kernel panics or apache crashes) a simple reboot triggered by a script did it. But the problem is: How to upgrade/maintain the w(eb-)application or the underlying OS without downtime? This wasn't really managable and i did this in the early morning ;) How can i achieve a "simple" High-Availability Cluster now? I thought of: DRBD with heartbeat with 2 VMs. And for the storage a RDM (raw device mapped) LUN and change the read-write-permissions for both VMs. Is this a good idea? Anyone has a better solution?

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• 3ware RAID in Windows 7

  - by user36484

  Just moved a 3ware 9500S-8 raid card and a few drives from my linux box into my win7 box. Windows Updates picked up the 3ware driver and installed it. After a reboot I checked Disk Management and it shows the array as one solid drive with the correct size. The only issue is that its not assigned a drive letter and when I right click on it my only option is to Convert to Dynamic Disk... From what I've read this is not something I want to do. What are my options?

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• IBM Bladecentre H Bootup

  - by Spence

  I have a bladecentre with blades, network and a SAN in a single rack. What I'd like to do is control the startup of the bladecentre so that when the rack is powered on that the blades will delay their bootup until the SAN is powered on correctly. Is this even possible? We have an AMM in the chassis if that helps. Basically we are looking into the reboot that occurs after power is restored to a UPS. I sincerely apologise for the noobness of this question, but I am a software guy trying to help :)

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• Hostname Problem On WHM / cPanel Installation

  - by Eray

  My CentOS 5.6 server's hostname was "centos" . And then i change it to my domain : hostname domain.com And i started to installing WHM / cPanel as explained in here : http://etwiki.cpanel.net/twiki/bin/view/AllDocumentation/InstallationGuide/InstallingCpanel It's installed very well. And the i reboot my server. After rebooting, i was execute this command for open WHM's 2087 port : iptables -I RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 2087 -j ACCEPT Now i'm trying to browse domain.com:2087 i'm getting Server (centos) not found .I noticed it's forwarding to my old hostname (centos) . And then execute this command to verify me hostname hostname it's returned "centos" again. I'm not sure, why it's returned to old hostname. (I think it returned to old hostname after rebooting) . I'm changed it one more time : hostname domain.com Finally, now my hostname is domain.com . BUt still i'm getting centos server not found error. This is result of iptables -L command. P.S. : domain.com/cpanel is working

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• Upgraded from fc10 to fc12 now I have eth0_rename, how do I get back to plain old eth0?

  - by shank

  I upgraded from Fedora 10 to Fedora 12. Unfortunately, my ethernet interface eth0 is now named eth0_rename. I'd like to get back to having it named plain old eth0. I googled a bit but the solution of removing the eth0 entry from /etc/udev/rules.d/70-persistent-net.rules seems to have no effect (I restarted the network service but didn't reboot). The interface works just fine although I could see a script or two having a problem with the format. So, it's more of an inconvenience thing than anything else. Any ideas? Thanks.

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• Windows 2008 DHCP service fails - "...failed to see a directory server for authorization."

  - by ewwhite

  I have a small environment running Windows 2008 R2 where the DHCP service on the domain controller fails every two weeks. The most-visible error is Event ID 1059 and the Event Viewer message is: "The DHCP service failed to see a directory server for authorization." The setup features two domain controller and the usual services and roles (file, print, Exchange). Restarting the service fails for a variety of reasons. I've had the following messages at different times: "Not enough storage is available to complete this operation". "Unable to determine the DHCP Server version for the Server 192.168.x.x" "The DHCP service has detected that it is running on a DC and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service." A reboot of the domain controller resolves the issue for ~2 weeks. The systems are virtualized and there are no network connectivity issues. Any ideas what's happening here?

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• How do I change HOSTNAME on an Ubuntu server?

  - by BryanWheelock

  I'm attempting to change the hostname on my shared server with Slicehost so I can setup Postfix as a null client. I edited /etc/hosts and after reboot, the hostname is still incorrect. What am I doing wrong? username@mail Fri Jul 01 13:01:32 ~ $ sudo cat /etc/hostname mail.domain1.com username@mail Fri Jul 01 13:01:45 ~ $ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain 208.78.100.198 mail.domain1.com username@mail Fri Jul 01 13:02:13 ~ $ hostname -f pop.where.secureserver.net I also intend to add another domain to this server, how do I configure this correctly.

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• VMXNET3 nic loses the ability to update ARP table after N hours

  - by Peter

  I have a fedora 18 VM that stops updating the arp table on eth1 after running for a number of hours to days. There are other VMs on the same hypervisor that can access all of the same networks without issue. A tcpdump of the offending NIC shows only ARP broadcasts but no responses. None of the other VMs on the vDS see the ARP broadcasts from the offending NIC. The only way I can currently solve the problem is to reboot the VM and then everything works for a while. I've tried changing the port on the vDS and even flipping the network configurations after I lose eth1's ARP table, but the ARP problem follows eth1 but I can access the machines that were originally on eth1. If I statically add the arp entries for machines on the same subnet I have no problems with connectivity. The Hypervisor is an HP BL49X series with flex-10 network modules. Has anyone seen anything like this before?

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• linux log memory hogging issue

  - by helpmhost

  Hi, We have a VPS server (it's using Virtuozzo). On a few occasions now, our VPS memory was fully used up and no new connections could be made to the server on SSH, SMTP, or POP. The only thing that works is connecting to the web service. Luckily, plesk is running on the VPS and we have been able to reboot it through plesk (as well as see that the RAM is 100% used). I would like to find what process is causing this. I have a feeling it's MySQL, but don't really know. Is there some sort of logging I could implement that would help me find out what was the cause of this next time it happens? Thanks.

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• Thinkpad CPU temperature reaches 100°C after 10 minutes of heavy use

  - by Nicolas Raoul

  Less than two years ago, I bought a Lenovo Thinkpad R500. When using the CPU heavily, it sometimes decides to reboot. I am using Linux, and a widget shows me the CPU temperature. The PC usually reboots when the temperature of the first core gets over 100°C Since I switched from Ubuntu 2010.10 32bit to Ubuntu 2011.04 64bit, it crashes much more often. I survive using these techniques: When in the office, I use a laptopcooler. When outside, I underclock to 800 MHz, by doing so it does not get too warm. QUESTION: Is it normal that a Thinkpad crashes if the CPU is at 100% for more than 10 minutes? How can I use the full power of my computer, for instance when showing CPU-hungry business intelligence tools to clients? The computer does not really feel that hot. Maybe the sensor itself is reporting wrong temperatures? Can I tell the BIOS to ignore it?

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• KB2494088 Always Fails : How to get it to install (or stop trying to)?

  - by Peter K.

  I have a problem where KB2494088 (a SQL Server 2008 R2 patch) continually fails to install when I reboot my system. Downloading the manual patch and trying to apply it says: The SQL Server patch package is part of a general distribution release (GDR). This package cannot be applied since this SQL Server feature has already been patched. To continue, you must install a higher version of the SQL Server patch. Most other posts (this, this) suggest it's either a failed (or cancelled) past installation or requires a SQL server repair. I've looked at registry settings and tried the repair option, but nothing seems to work.

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• Puppet nodes cant' find master, ec2 public versus internal ip addresses and hosts files

  - by Blankman

  If I setup my hosts files such that they reference all other ec2 nodes using the internal ip addresses, will this work or do I have to use the external ip addresses? Do I need to specify anything in my security group to get internal ip addresses to work? e.g. /etc/hosts ip-10-11-12-13.internal some_node_name If I do this, can I reference some_node_name anywhere in my scripts where I would have used the ip address previously? On my puppet agent servers, I have a reference to my puppet master like: public-ip-here puppet When I reboot my puppet agent's, syslog shows they couldn't find the master with the message: getaddinfo : name or service not known I did get it to work by updating /etc/default/puppet and I added to the options: --server=public-ip-here From what I read, puppet will by default try using 'puppet', and I set this in my hosts file so why wouldn't it be picking this up?

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• How to troubleshoot down terminal service/CITRIX sessions, when the process just won't terminate?

  - by Chad

  Running a CITRIX presentation server farm, version 4.5.6 on Windows 2003 sp2. In the CITRIX Access Management Console, I sometimes get a session that shows it's in a down state - but has none of the normal info associated with it (user name, applications, client name, idle time, etc...). It does say which servers it's on, so I check out that server's terminal services manager. I can see the down session but cannot reset it. I get: (Error 7024 - the requested operation cannot be completed because the terminal connection is currently busy processing a connect, disconnect, reset, or delete operation.) So I go to the task manager and look up the processes running under that session id. I see it's one of my published apps, but when I try to end the process - it simply does nothing and the process remains. Any way to get rid of these sessions without a server reboot?

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• Which Message Queue should I choose (must run on Linux)

  - by MHS

  There are many open source Message queues for Linux, and I need some help deciding what I should go for. My problem is simple - I get sent a list of files that needs to be processed. Each job can't be split up, but they are self contained and can be spread to multiple computers. I'm thinking of solving this using a message queue. Multiple clients send a message to a central queue. Each queue has a number of subscribers that will take jobs from that queue when they have finished processing the current job. Ideally it should have the following qualities Message queue must be able to store unprocessed messages in case of a shutdown/reboot A job can only be processed by a single subscriber (don't want duplicate jobs) The subscribers should be able to send jobs of their own, that will be processed by a different set of subscribers. Can anyone suggest a simple to use message queue?

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• How can I tell a fresh ubuntu 9.0.4 install to boot from an external Mac OS X usb drive?

  - by Richard Dyce

  I have a reformatted Mac mini containing only a fresh install of Ubuntu 9.0.4. The Apple boot loader as been removed, so I can't hold down option, or the c key to get it to reboot form the install DVD. I do have an external drive (with both a usb and firewire interface available) with a bootable cloned OS X system on it. What steps do I need to go through to in order get grub to see the external drive, and to boot from it so that I can reformat the internal disk as an OS X drive?

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• Switching from Amazon EC2 instance-store to EBS Volume

  - by Adam

  Hi, I have an Amazon EC2 instance that is using an instance-store as its root device. It has no EBS volumes attached to it. It has a database and a running web application on it. If I understand correctly this is a bad setup as I would lose all the data on the instance if it were to reboot. I would like to correct this mistake. I'd like to move all the data on the running instance to a new EBS volume and make that new volume the root device. How do I go about doing this? Thanks!

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• Odd Tools and Techniques for System Administrators

  - by Joseph Kern

  There's been a lot of questions centering on Software Tools for System Administrators. But I would like to know about any odd physical tools or techniques that you've used; Something that you never expected to be useful, but ended up saving the day. I'll go first: A Camera Phone. An application server had a major power issue that borked the RAID. Many of the disks were offline. Before I took the plunge and forced disks back online, I took a picture of the RAID BIOS screen with my camera phone. Having the exact layout of the RAID stored safely in my pocket, I was able to reset the RAID, and reboot the server. What odd tools/techniques have you used?

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• EC2 out of space on root disk, moving it to ephemeral

  - by Joseph Misiti

  I am spawning a few test servers on ec2 that happen to be m1.larges. I am using these test servers for load balancin testing. Anyways, most of the servers I have used before have been backed by EBS, but these instances (ubuntu 11.04) obviously come with a lot of ephemeral space located @ /mnt. What I noticed that is happening is I am running on space on the root disk. I am trying out this tutorial http://www.turnkeylinux.org/docs/using-instance-storage moving my /home + /usr directories to /mnt and then remounting them. This works except it does not survive a reboot. Am I missing something here or is this tutorial not completely correct. How do I make space on my / drive so I can do stuff and survive re-boots.

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• rsync error unexplained error (code 255) at io.c

  - by kabeer

  I was using a script to perform rsync in sudo crontab. The script does a 2-way rsync (from serverA to serverB and reverse). After i reboot both the server machines, the rsync is not working in sudo crontab. I also setup a new cronjob and it fails, The error is: rsync error: unexplained error (code 255) at io.c(600) [sender=3.0.6] rsync: connection unexpectedly closed (0 bytes received so far) [receiver] However, when run from terminal, the rync script works as expected without issues. please help.

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• Windows 7 backup network restore: "The network location cannot be reached, 0x800704CF"

  - by Znarkus

  When I try to restore from a backup image, I get this error. After I enter the network address (\\10.0.0.1\backup or \\z\backup), the wizard presents me with the network login dialog, which leads me to believe that it can connect to the network (yes, the share is password protected). I decided to install Windows 7, since I thought that I could restore the image from Windows. The restore process in Windows can locate the backups, but to do an image restore it needs to reboot to the wizard above. Which of course gives the very same error. This is what \\z\backup looks like. Please help, I'm getting desperate. Update: Forgot to mention that the NAS is running Ubuntu, if that's relevant.

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• Setting the Timezone with an automated script

  - by Tom

  I'm writing scripts to automate setting up new slicehost installations. In a perfect world, after I started the script, it would just run, with no attention from me. I have succeeded, with one exception. How do I set the timezone, in a permanent (survive reboot) and sane (adjust for standard and daylight savings time, so no just forcing the date) ... manner that doesn't require input from me? Currently, I'm using dpkg-reconfigure tzdata This doesn't seem to have any way to force parameters into it. It demands user input. EDIT: I'm editing here, rather than commenting, since comments don't seem to allow code blocks. Here's the actual code I ended up with, based on Rudedog's comment below. I also noticed that this doesn't update /etc/timezone. I'm not certain who uses that, but in case anybody does, I'm setting that too. TIMEZONE="America/Los_Angeles" echo $TIMEZONE > /etc/timezone cp /usr/share/zoneinfo/${TIMEZONE} /etc/localtime # This sets the time

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• Random flickering on 2.6.32 kernels after suspend

  - by whitequark

  I have XUbuntu 9.10 installed on a Toshiba NB200 netbook with Intel video card that's handled with i915 driver. With 2.6.31 stable, recommended kernel everything but WiFi works fine: Atheros ath9k WiFi shows too small signal power and loses packets in 'bursts' sometimes. With 2.6.32-* (I tested -9 to -11 from Ubuntu's kernel unstable ppa) everything works fine just prior to first suspend: echo mem >/sys/power/state. After it random unidentified fullscreen 'one-frame' flickering begins in Xorg, and after a couple of minutes everything eventually hangs while showing filled grey (not white; it is like default button colour) screen; no X keys are working: Ctrl+Alt+Fn don't, blind typing in console too. Magic SysRq still works and I was able to reboot. Also there is one out-of-tree kernel module called omnibook that is required to turn on WiFi and Bluetooth. Any advices?

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• Windows 2008 R2 software RAID 1 (disk failure)

  - by thj

  I've bought myself a new server that I'm going to use for some various software developing projects. I have a simple question about Windows 2008 R2 x64 software raid. What if disk 1 fails? Will it automatically swap over to disk 2? And boot up on disk 2 after reboot? Or how do you handle this? Should I use some tools for monitoring my RAID 1? So if it fails or if there are any errors, I will receive an email. Do you know of a tool capable of this? Or can I do it by having a tool monitoring the event viewer? Finally, I'm looking for a tool to test the speed (read/write) of my harddrives, before and after introducing RAID 1. What's the best free tool out there?

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• General video performance affected on Mac OSX 10.5 (PowerBook G4)

  - by r0ca

  Hi all, I'm quite new to Mac and I just got a PowerBook G4 for free. I installed OSX 10.5 on it and for the first two weeks, everything was going kinda smooth even if this is similar to a P3. I'm not expecting awsome video performance but at least be able to watch some videos from Youtube. Yesterday night, I installed Office 2008 for mac and this morning, even after a reboot, my computer is way much slower that I used to know. I watched a youtube video and the framerate was 1:1. I also noticed it on flash adds, it's way slower! Is there anything that I can do to increase video performance, see what's the process list running and taking more GPU or CPU, what's taking more ram and stuff like that?! What do you guys, Mac pros, would do on an old laptop with OSX 10.5 Thanks!

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• IP KVM switch, or serial console box for remote admin?

  - by grahzny

  We have a small server farm (11 now, may add more in the future) of HP Proliant DL160 G6s. They all run either Linux (server only, no X11) or VMware ESX. We had intended to get models with iLO, in case BIOS-level remote admin became an issue, but that didn't happen. I had an IP KVM switch recommended to me (along with some sort of Remote Reboot hardware.) I've since realized that none of our machines need GUI administration, so perhaps a serial console switch would be a cheaper and more appropriate option. Something like this: http://www.kvm-switches-online.com/serimux-cs-32.html Do you folks have an opinions on which way is a better choice? Should we go for the ease of setup (plug and go, instead of turning on the feature in the BIOS and making sure the serial settings are correct) and the flexibility of an IP KVM switch even with the extra cost? Or is a serial console switch just fine?

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