virt March 2012

virt@lists.centos.org

11 participants
11 discussions

CentOS 6.2 / kvm / Windows XP sp3 guest crashes repeatedly after a few minutes
by Philip Bondi 27 Aug '12

27 Aug '12

Hello to all: Recently upgraded from CentOS 6.0 to 6.2 to get USB passthrough support by performing "yum update". USB passthrough works great, but now my Windows XP sp3 guest crashes repeatedly after a few minutes. [root@shackleton-eth0 log]# rpm -qa|egrep '(kvm|kernel|libvirt-|qemu)'|sort abrt-addon-kerneloops-2.0.4-14.el6.centos.x86_64 dracut-kernel-004-256.el6_2.1.noarch gpxe-roms-qemu-0.9.7-6.9.el6.noarch kernel-2.6.32-220.7.1.el6.x86_64 kernel-2.6.32-71.el6.x86_64 kernel-devel-2.6.32-220.7.1.el6.x86_64 kernel-devel-2.6.32-71.el6.x86_64 kernel-firmware-2.6.32-220.7.1.el6.noarch kernel-headers-2.6.32-220.7.1.el6.x86_64 libreport-plugin-kerneloops-2.0.5-20.el6.x86_64 libvirt-0.9.4-23.el6_2.6.x86_64 libvirt-client-0.9.4-23.el6_2.6.x86_64 libvirt-python-0.9.4-23.el6_2.6.x86_64 qemu-img-0.12.1.2-2.209.el6_2.4.x86_64 qemu-kvm-0.12.1.2-2.209.el6_2.4.x86_64 This message in /var/log/messages precedes every crash: [root@shackleton-eth0 log]# grep kvm /var/log/messages Mar 19 09:09:25 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 09:15:48 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 09:25:51 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 11:21:27 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 12:07:16 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 12:16:14 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 13:46:27 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 Mar 19 14:06:49 shackleton-eth0 kernel: kvm: 2889: cpu0 unhandled wrmsr: 0x198 data 0 CentOS 6.0 was stable. Windows XP sp3 did not crash. Formerly, I was running virtio-win-0.1-15.iso, but now upgraded to virtio-win-0.1-22.iso and Windows XP sp3 remains unstable.

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Has anyone been able to start a Fedora 16 VM in Xen PV?
by Scot P. Floess 08 Jul '12

08 Jul '12

All, I've had a heck of a time getting Fedora 16 to run as a guest VM under CentOS 5.7 host as a paravirtualized Xen guest. I believe the issue has something to do with Fedora 16 using grub2... When I attempt to start the VM (via xm create), I get this error: Using config file "/etc/xen/fedora-workstation". Traceback (most recent call last): File "/usr/bin/pygrub", line 686, in ? fs = fsimage.open(file, get_fs_offset(file)) IOError: [Errno 95] Operation not supported No handlers could be found for logger "xend" Error: Boot loader didn't return any data! In my kickstart, I had to create a partition for F16 as: part biosboot --fstype=biosboot --size=1 I didn't readily find the error when googling... Has anyone been able to run F16 as a PV guest? And if so, what did you do to make it happen????? Thanks!!!!!!!!!!!!! Scot P. Floess RHCT (Certificate Number 605010084735240) Chief Architect FlossWare http://sourceforge.net/projects/flossware http://flossware.sourceforge.net https://github.com/organizations/FlossWare

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centos6 and xen4 dom0 memory allocation
by Peter Peltonen 08 Jul '12

08 Jul '12

Hi, This is slightly OT as xen is not officially supported in EL6. But maybe someone else is running it on centos6 as well and could help me out here: I have problems allocating a static amount of memory for my xen dom0. It seems to reduce when new domUs are created, even though I *think* ballooning is disabled. Can someone advise me what I'm doing wrong? I have xen-4.1.1-3 installed from http://xenbits.xen.org/people/mayoung/EL6.xen on my centos6 server. I am running 2.6.32-131.12.1.el6.xendom0.x86_64 kernel available from the same place. 'xl info' reports about available memory as follows: total_memory : 24567 free_memory : 3698 xen_commandline : dom0_mem=2048M and in xend-config.sxp I have: (dom0-min-mem 256) (enable-dom0-ballooning no) (total_available_memory 0) Now one would think that I should have 2048M memory for dom0, right? I started from there, but when starting domUs it has been reduced to 1140M even though I think ballooning is disabled and there is free memory available? And the weird thing is that dom0 has done some swapping: # free -mt total used free shared buffers cached Mem: 1140 1052 88 0 2 12 -/+ buffers/cache: 1038 102 Swap: 8194 85 8109 Total: 9335 1138 8197 Shutting down domUs and making more memory available does not reverse the effect, dom0 does not allocate more memory. What am I missing here or is my xen setup acting strangely here? Best regards, Peter

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New Tutorial - RHCS + DRBD + KVM; 2-Node HA on EL6
by Digimer 19 Jun '12

19 Jun '12

Hi all, I'm happy to announce a new tutorial! https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial This tutorial walks a user through the entire process of building a 2-Node cluster for making KVM virtual machines highly available. It uses Red Hat Cluster services v3 and DRBD 8.3.12. It is written such that you can use entirely free or fully Red Hat supported environments. Highlights; * Full network and power redundancy; no single-points of failure. * All off-the-shelf hardware; Storage via DRBD. * Starts with base OS install, no clustering experience required. * All software components explained. * Includes all testing steps covered. * Configuration is used in production environments! This tutorial is totally free (no ads, no registration) and released under the Creative Common 3.0 Share-Alike Non-Commercial license. Feedback is always appreciated! -- Digimer E-Mail: digimer(a)alteeve.com Freenode handle: digimer Papers and Projects: http://alteeve.com Node Assassin: http://nodeassassin.org "omg my singularity battery is dead again. stupid hawking radiation." - epitron

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Guests pausing suddenly
by Peter Hopfgartner 27 Apr '12

27 Apr '12

We have a CentOS 6.2 server with KVM. That server hosts 2 virtual machines, both with Centos 6.2, too. Regularly, one or both of the virtual machines pass to state "pause" without apparent reason. On resume, I do get have messages, like the following in /var/log/messages. Feb 28 21:50:45 achernar fcoemon: Failed to connect to lldpad Feb 29 08:23:56 achernar kernel: sd 0:0:0:0: [sda] Unhandled error code Feb 29 08:23:56 achernar kernel: sd 0:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT Feb 29 08:23:56 achernar kernel: sd 0:0:0:0: [sda] CDB: Write(10): 2a 00 06 db 70 78 00 00 38 00 Feb 29 08:23:56 achernar kernel: end_request: I/O error, dev sda, sector 115044472 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252047 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252048 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252049 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252050 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252051 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252052 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:56 achernar kernel: Buffer I/O error on device dm-0, logical block 14252053 Feb 29 08:23:56 achernar kernel: lost page write due to I/O error on dm-0 Feb 29 08:23:57 achernar fcoemon: error 111 Connection refused I could not find any sensible message on the pysical host, neither in /var/log/messages nor in /var/log/libvirt. We do have an almost identical server, same hardware, same software which does not have this problem. How could I proceed to better diagnose the cause of the troubles? Regards, -- Peter Hopfgartner web : www.r3-gis.com

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Re: [CentOS-virt] CentOS-virt Digest, Vol 55, Issue 10
by Su Zhang 25 Mar '12

25 Mar '12

On Sat, Mar 24, 2012 at 11:00 AM, <centos-virt-request(a)centos.org> wrote: > Send CentOS-virt mailing list submissions to > centos-virt(a)centos.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.centos.org/mailman/listinfo/centos-virt > or, via email, send a message with subject or body 'help' to > centos-virt-request(a)centos.org > > You can reach the person managing the list at > centos-virt-owner(a)centos.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CentOS-virt digest..." > > > Today's Topics: > > 1. Re: CentOS domU cannot boot up (Alexander Dalloz) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 24 Mar 2012 16:22:44 +0100 > From: Alexander Dalloz <ad+lists(a)uni-x.org> > Subject: Re: [CentOS-virt] CentOS domU cannot boot up > To: Discussion about the virtualization on CentOS > <centos-virt(a)centos.org> > Message-ID: <4F6DE6C4.3080802(a)uni-x.org> > Content-Type: text/plain; charset=ISO-8859-1 > > Am 24.03.2012 02:40, schrieb Su Zhang: > > Hello community, > > > > I encountered an error while installing CentOS as a domU on Xen. The DomU > > paused at boot up > > and failed with messages: "eth0: no IPv6 routers present". I've already > > attached a full screenshot. Can anyone tell me what is happening here? > > > > Thanks, > > The real issue appears to be the message before > > "xvda: unknown partition table" > > You will have to provide details about your system and setup to get help. > > Alexander > > Thanks for pinpointing the issue, here is the command line use for domU > installation: > virt-install -l http://mirror.centos.org/centos/5/os/i386/ -p -n cent5 -r 768 --vcpus=1 --disk=/srv/xen/mailserver.img --graphics vnc,listen=0.0.0.0,port=5901 Here is my kernel info: uname -a Linux XenTester 3.1.0-rc9+ #1 SMP Mon Mar 12 18:18:34 CDT 2012 x86_64 x86_64 x86_64 GNU/Linux Other xen related info: [root@XenTester su]# /etc/init.d/xend start [root@XenTester su]# xm list Name ID Mem VCPUs State Time(s) Domain-0 0 3328 2 r----- 108.6 cent5 768 1 0.0 [root@XenTester su]# xm info host : XenTester release : 3.1.0-rc9+ version : #1 SMP Mon Mar 12 18:18:34 CDT 2012 machine : x86_64 nr_cpus : 2 nr_nodes : 1 cores_per_socket : 2 threads_per_core : 1 cpu_mhz : 2527 hw_caps : bfebfbff:20100800:00000000:00000940:0008e3fd:00000000:00000001:00000000 virt_caps : hvm total_memory : 4026 free_memory : 1171 free_cpus : 0 xen_major : 4 xen_minor : 1 xen_extra : .2 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable xen_commandline : cc_compiler : gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC) cc_compile_by : su cc_compile_domain : (none) cc_compile_date : Mon Mar 12 16:39:43 CDT 2012 xend_config_format : 4 [root@XenTester su]# Anything else info needed? Thanks, > > ------------------------------ > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt(a)centos.org > http://lists.centos.org/mailman/listinfo/centos-virt > > > End of CentOS-virt Digest, Vol 55, Issue 10 > ******************************************* > -- Su Zhang Ph.D Candidate Computing and Information Sciences Kansas State University

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CentOS domU cannot boot up
by Su Zhang 24 Mar '12

24 Mar '12

Hello community, I encountered an error while installing CentOS as a domU on Xen. The DomU paused at boot up and failed with messages: "eth0: no IPv6 routers present". I've already attached a full screenshot. Can anyone tell me what is happening here? Thanks, -- Su Zhang

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Installing Ubuntu 10.04 Lucid guest on Centos 5 using virt-manager
by Dennis Jacobfeuerborn 19 Mar '12

19 Mar '12

Hi, i'm trying to install an Ubuntu Lucid PV guest on a Centos host but I can't seem to find a working installation URL. I tried "http://ftp.ubuntu.com/ubuntu/dists/lucid/main/installer-amd64/" and various subdirectories but I always get the error "Could not find an installable distributio at ...". In the OS Variant box I chose Ubuntu 9.04 as that is the closest to what I'm trying to install. Any idea how this works? Regards, Dennis

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routing problem with domU bridged to two networks
by Peter Peltonen 16 Mar '12

16 Mar '12

As I received no response on the general CentOS list, I'll repost it here as the question is about Xen virtual machine routing. This is my network setup: http://pastebin.com/kyWpTQYU Lets assume my dom0's eth2 public ip is 1.2.3.33 and my dmz network 11.22.33.96/255.255.255.224 . I have created NAT from my LAN with iptables. You can see my /etc/sysconfig/iptables here: http://pastebin.com/1FqSTvPH And this is my dom0 routing table: http://pastebin.com/gNjTFHp5 My goal: To access NFS shares on a (non-virtualized) file server in the LAN network from the domU web server in the DMZ network. What I tried: I attached the domU to both bridges using this Xen config: vif = [ "mac=00:0c:29:de:3a:fe,bridge=xenbr0","mac=00:0C:29:76:19:85,bridge=xenbr1" ] and then created two eth interfaces inside the domU mapping to the MAC addresses above, giving eth1 an IP from the DMZ (11.22.33.111) and giving eth2 an IP from the LAN (192.168.0.12). After this I mounted the NFS share from the file server (192.168.0.2). My problem: If my domU web server is connected to both LAN and DMZ using the two bridges xenbr0 and xenbr1, I can access the NFS share from the domU web server and everything else works as expected, except for one thing -- my workstations in the LAN cannot anymore access the web server: web pages do not open anymore and from the workstations I cannot ping the domU. If the web server domU is only connected to DMZ via xenbr0, the workstations can access it ok. Any advice what I am doing wrong and I could fix my setup? Regards, Peter

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IDE mapping to SATA in virtual guest
by Bradley Leonard 15 Mar '12

15 Mar '12

Hi, I'm trying to map a logical volume (sata) as an ide drive from my centos 6.2 host to my centos 6.2 guest. Here is xml snippet: <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/VolGroup02/LogVol00'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> Dmesg shows this: sd 0:0:0:0: [sda] 5859368960 512-byte logical blocks: (2.99 TB/2.72 TiB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sda: unknown partition table sd 0:0:0:0: [sda] Attached SCSI disk sd 0:0:0:0: Attached scsi generic sg0 type 0 Inside the guest, it shows up as a sata drive: [root@nemedia ~]# sfdisk -l /dev/sda Disk /dev/sda: 364728 cylinders, 255 heads, 63 sectors/track sfdisk: ERROR: sector 0 does not have an msdos signature /dev/sda: unrecognized partition table type No partitions found [root@nemedia ~]# sfdisk -l /dev/hda /dev/hda: No such file or directory sfdisk: cannot open /dev/hda for reading I don't see how this would be a problem except for the fact that no matter what kind of filesystem I try to create on /dev/sda from the guest, I get errors when I try to mount it. No matter what I do, I cannot mount any filesystem from that device inside the guest. Both the cdrom and block device are showing up as scsi devices even though I'm passing them through as ide devices. Am I doing something wrong or am I missing something completely? I've try searching for solution or a hint, but I must not be searching for the right thing. Can anybody provide me some advice or point me somewhere? Thanks in advance. Brad -- Bradley Leonard EMail: bradley at stygianresearch.com Rob - "The hills are alive with the..the..sound of monkeys?" Bucky - "It's in the key of delicious." Life is simple. Humans make it complicated. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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virt March 2012