virt August 2008

virt@lists.centos.org

38 participants
28 discussions

Cannot start xen domUs anymore, domUs hang on kernel startup, happens after a long dom0 uptime
by Pasi Kärkkäinen 14 Aug '08

14 Aug '08

Hello! I've noticed this problem two times now.. last time I fixed it by rebooting the (centos 5.1 x86 32b) xen host/dom0. Symptoms: - Already running domUs (debian 2.6.18-6-xen-686 32b PAE) continue running and working OK - Cannot start new domUs (debian 2.6.18-6-xen-686).. kernel bootup just hangs before running initrd. Same domU with the exact same xen domU cfgfile worked earlier. - This problem starts to happen after a "longer" uptime.. atm uptime for the dom0-host is 174 days. Cannot say what the actual "limit" is.. last time I used the dom0 everything worked fine, now it doesn't.. "xm list" shows the domain as "-b----" and the Time(s) for the domain does not increase.. it stays at 1.9 or so. It might increase to 2.0 after 15 mins or so.. it looks like nothing happens in domU kernel. "xm console" shows the bootup has stalled.. destroying the domU and restarting it might show the hang in a bit different place (+- a couple of lines). It always hangs before actually executing initrd image. Example console output: checking if image is initramfs... it is Freeing initrd memory: 12028k freed Grant table initialized NET: Registered protocol family 16 SMP alternatives: switching to SMP code <hangs here, nothing happens anymore> Like said, it could be a couple of lines later or earlier where it hangs.. I tried changing the domU to use just a single vcpu.. doesn't help. I tried changing (lowering and increasing) the amount of memory.. didn't help either. Any ideas how to debug this? -- Pasi

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Check out Proxmox VE... can CentOS improve on this?
by Scott Dowdle 13 Aug '08

13 Aug '08

Greetings, I'm a big OpenVZ fanboy. I've sent a few emails on this list that proves that... and I'm sure I've annoyed some people... but be that as it may... I would like to draw everyone on this list's attention to Proxmox VE. What is Proxmox VE? Here's a review from the end of June: ProxMox: The high-performance virtualization server for the rest of us http://blogs.zdnet.com/BTL/?p=9181 It is a "bare-metal" Linux distribution based on Debian that has been stripped down to a minimum that includes a kernel that provides support for both KVM and OpenVZ so it does fully virtualized machines (requiring hardware support in the CPU) and containers. It has a nice web-based management system that is fairly feature complete and allows for the easy creation and management of KVM virtual machines and OpenVZ containers. It also has clustering features. That's a long enough description. Ok, how does this differ from everything else out there? 1) It is bare-metal... just pop in the CD (which is a 250MB download)... boot up the machine, answer about two questions... a few minutes worth of install time... and a reboot later... you have what looks very similar to a VMware ESX host... with a console (text) login screen that says... I man a Proxmox VE machine... connect to me at the following URL. Start browsing. 2) It supports both fully virtualized machines AND containers 3) It has a really nice, maturing (two releases so far) web-interface for managing everything 4) It is cluster aware - add additional Proxmox VE machines, use the really simple command line program to make each machine aware of all of the others... and bang the web-interface on any machine sees all of the virtual machines on all nodes 5) The web-interface includes VNC-java-applet based access so you can graphically attach to any virtual machine including the console of an OpenVZ container. For KVM machines, you get to see the BIOS / boot from ISO image before virtual machine is even on the network 6) Proxmox VE shows the potential that exists with a FOSS OS, FOSS Virtualization products... in a completely FOSS product... that is freaking easy to install, setup and use... that works well Problems - Some of the features aren't done yet. Proxmox VE is a little ahead of its time. Live migration doesn't quite work for OpenVZ yet (although it works fine in stock OpenVZ with their stable kernel branches). Proxmox VE is still in beta. Basically, if and when the Proxmox VE concept is fully realized and matured it'll be a killer app that makes business folks go... Linux DUH... for those that care about virtualization... like yoous guyyys on this hea list. Ok... so any chance CentOS or some of the members of the CentOS development community would like to borrow the Proxmox VE idea (perhaps even their web-interface code) and make something like Proxmox VE... but based on CentOS... that supports Xen and OpenVZ? It would have the benefit of being able to run on both systems with and without hardware support for Virtualization - if you have VT you can run fully virtualized Xen AND para-virtualized machines... if not... para-virtualized VMs only... and in both cases OpenVZ containers. The form-factor would have to retain all of the properties I mentioned above... I think... for it to be a huge success. Where to start? Get two machines to test on... desktops are fine as long as they have VT in the CPU. Download the 250MB Proxmox VE iso. Burn disc. Boot disk. Answer two questions. Wait 5 minutes. Reboot. Play with it. See what you think... and use your imagination. If impressed, plan the take over of the world with a similar setup based on CentOS. Then when RHEL6 comes out and KVM is here... switch to KVM. BTW, the OpenVZ Project had a kernel package built on the RHEL kernel that included both Xen and OpenVZ but I can't seem to find it now. Notice I'm not providing any links to Proxmox VE. You have to care enough to google for it. :) TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work]

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NetBSD on CentOS 5.2 Xen 3
by white list 13 Aug '08

13 Aug '08

hi all good people, can someone direct me to a solution i get the following error # xm create -c vm03 Using config file "./vm03". Error: (2, 'Invalid kernel', 'xc_dom_compat_check: guest type xen-3.0-x86_32 not supported by xen kernel, sorry\n') here is my configuration file /etc/xen/vm03 kernel="/boot/netbsd/netbsd-INSTALL_XEN3_DOMU.gz" name = "vm03" maxmem = 512 memory = 512 vcpus = 1 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "tap:aio:/var/lib/xen/images/vm03.img,wd0d,w" ] vif = [ "mac=00:16:3e:fc:84:3c,bridge=xenbr0" ] Thanks, - Augustin

2 1

NetBSD on Xen 3.1 CentOS 5.2
by white list 13 Aug '08

13 Aug '08

hi all good people, can someone direct me to a solution, I get the following error. # xm create -c vm03 Using config file "./vm03". Error: (2, 'Invalid kernel', 'xc_dom_compat_check: guest type xen-3.0-x86_32 not supported by xen kernel, sorry\n') Here is my config file kernel="/boot/netbsd/netbsd-INSTALL_XEN3_DOMU.gz" (Download from amd64) name = "vm03" maxmem = 512 memory = 512 vcpus = 1 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "tap:aio:/var/lib/xen/images/vm03.img,wd0d,w" ] vif = [ "mac=00:16:3e:fc:84:3c,bridge=xenbr0" ] ~ Thanks, - Augustin

2 2

Djbdns Working in VPS ?
by Lodewijk christoffel 13 Aug '08

13 Aug '08

Hi, I try dig google for this question and found little notes in there, I already try it on my VPS machine and end up with nothing working... I'm using CentOS 4.6 in VPS (openvz), at first i'm trying BIND and it's just nice, and now i want to try djbdns... Is it djbdns working in VPS ? if not, is there anything that i can work on it ? i can only afford VPS for now. Thank you... Regards, Ludwig

2 4

NetBSD, FreeBSD on Xen 3.1
by white list 13 Aug '08

13 Aug '08

Hi all, please direct me to NetBSD install file or FreeBSD to install on Xen 3.1 on (CentOS 5.2) Thanks, - Augustin

1 0

Installing guest OS on Xen 3
by white list 13 Aug '08

13 Aug '08

WHen I try to install NetBSD this it what is get xm create vm02 -c Using config file "./vm02". Error: HVM guest support is unavailable: is VT/AMD-V supported by your CPU and enabled in your BIOS? * My vm02 file in /etc/xen/vm02* kernel="/usr/lib/xen/boot/hvmloader" builder='hvm' name = "vm02" #uuid = "177aedba-c62a-e7df-84c3-4c870b2cade4" maxmem = 512 memory = 512 vcpus = 1 #bootloader = "/usr/bin/pygrub" on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "tap:aio:/var/lib/xen/images/vm02.img,xvda,w" ] vif = [ "mac=00:16:3e:66:84:3c,bridge=xenbr0" ] cdrom='/dev/hda' ne2000=0 boot='d' Please Help! Thanks, Augustin

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Re: [CentOS-virt] Djbdns Working in VPS ?
by Hristo Benev 13 Aug '08

13 Aug '08

> >------------------------------ > >Message: 5 >Date: Wed, 13 Aug 2008 05:38:35 +0700 >From: Lodewijk christoffel >Subject: [CentOS-virt] Djbdns Working in VPS ? >To: centos-virt(a)centos.org >Message-ID: >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >Hi, > >I try dig google for this question and found little notes in there, >I already try it on my VPS machine and end up with nothing working... > >I'm using CentOS 4.6 in VPS (openvz), at first i'm trying BIND and it's >just nice, >and now i want to try djbdns... > >Is it djbdns working in VPS ? if not, is there anything that i can work >on it ? >i can only afford VPS for now. > > >Thank you... > > > >Regards, >Ludwig > > > >------------------------------ > >_______________________________________________ >CentOS-virt mailing list >CentOS-virt(a)centos.org >http://lists.centos.org/mailman/listinfo/centos-virt > > >End of CentOS-virt Digest, Vol 12, Issue 10 >******************************************* > I did not try it on OpenVZ, but under XEN is working - so I assume that it should work under other virtual machines too. FoxB --------- http://hbcom.info http://blog.hbcom.info

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Not file system fox xbd0 (dev 0x8e00) cannot mount root, error =79
by white list 12 Aug '08

12 Aug '08

I get the following error does anybody know how to fix it. Thanks, root device (default xbd0a): ex0 use one of: xbd0[a-p] xennet0 md0[a-p] ddb halt reboot root device (default xbd0a): xbd0a dump device (default xbd0b): xbd0b file system (default generic): generic root on xbd0a dumps on xbd0b mountroot: trying lfs... mountroot: trying ffs... mountroot: trying ext2fs... mountroot: trying nfs... mountroot: trying smbfs... mountroot: trying ntfs... mountroot: trying msdos... mountroot: trying cd9660... mountroot: trying coda... no file system for xbd0 (dev 0x8e00) cannot mount root, error = 79 Thanks, - Augustin

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2 more problems
by Paolo Supino 12 Aug '08

12 Aug '08

Hi I forgot to write 1 more problem I encountered: 1. I configured a network proxy, but except for Firefox all other applications don't use it (mainly the packager manager) 2. Root's gnome pull down menus (before I crashed X) freeze and can't be used. When tried to restart the session it informed me that there is already a one running and came up without the menus. Has anyone encounter a similar problem? -- TIA Paolo

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virt August 2008