- Users - libvirt List Archives

[libvirt-users] Anyone interested in forming a libvirt "docs" team?
by Justin Clift 21 Dec '10

21 Dec '10

Hi all, There's a lot of documentation for libvirt that needs improving, so wondering if anyone would be interested in forming a libvirt "docs" team to help make that happen? While some of the documentation needs people familiar with specific pieces of libvirt, there's also a lot that doesn't, and just needs people with some free time and willingness to help. Anyone up for it? :) Regards and best wishes, Justin Clift

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[libvirt-users] private DNS servers & dnsmasq
by Quint Van Deman 21 Dec '10

21 Dec '10

Hello-- I'm trying to work through the last piece of the puzzle regarding dns resolution for my guests. To do so I'd like to be able to pass the following to the dnsmasq child process: -S /private.net/127.0.0.1 (as referenced in the dnsmasq man page) -S /sub.private.net/127.0.0.1 However, I cannot find any documentation that suggests the xml schema defining the virtual network supports this option. Is there a way of doing this? The ability to pass a '-q' (log queries) would be nice too for debugging purposes. My DNS setup is all working properly (as confirmed with dig & server overrides throughout the environment), but resolv.conf based resolution isn't able to find servers for either of those two domains (dnsmasq is trying to resolve them via an upstream server, which obviously fails). Thanks for any advice. -Quint

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[libvirt-users] Error creating a new vm
by Anthony Davis 21 Dec '10

21 Dec '10

Hi, I wonder if anyone can help me with this, I have been trying to get a vm up and running for a while now and cant for the life of me work out why it isnt working. The errors I get arnt very helpful and im at a loss as how to debug this any further. Here is the command and output that I get...(Also nothing shows up with virsh list --all after so its starting to install then dropping out) Hope someone can help. Thanks! [root@server ~]# /usr/bin/virt-install -n test01 -r 512 --os-variant=virtio26 -l http://172.16.0.100/iso/centos-5.5/ --nographics --noautoconsole --disk path=/dev/vg_storage/test01, bus=virtio -w bridge:br0 -x "console=ttyS0 ks=http://172.16.0.100/ks/ks-vm.cfg" -d -v Sun, 19 Dec 2010 20:45:05 DEBUG Requesting libvirt URI default Sun, 19 Dec 2010 20:45:05 DEBUG Received libvirt URI 'qemu:///system' Sun, 19 Dec 2010 20:45:05 DEBUG Requesting virt method 'hvm' Sun, 19 Dec 2010 20:45:05 DEBUG Received virt method 'hvm' Sun, 19 Dec 2010 20:45:05 DEBUG Hypervisor name is 'qemu' Sun, 19 Dec 2010 20:45:05 DEBUG parse_disk: returning ('/dev/vg_storage/test01', None, None, 'disk', None, False, False, None, True, None) Sun, 19 Dec 2010 20:45:05 DEBUG Setting size for existing storage to '10.0' Sun, 19 Dec 2010 20:45:05 DEBUG Detected storage as type 'block' Sun, 19 Dec 2010 20:45:05 DEBUG Setting size for existing storage to '10.0' Sun, 19 Dec 2010 20:45:05 DEBUG Detected storage as type 'block' Sun, 19 Dec 2010 20:45:05 DEBUG Setting size for existing storage to '10.0' Sun, 19 Dec 2010 20:45:05 DEBUG Detected storage as type 'block' Sun, 19 Dec 2010 20:45:05 DEBUG Setting os type to 'linux' for variant 'virtio26' Sun, 19 Dec 2010 20:45:05 DEBUG DistroInstaller location is a network source. Starting install... Sun, 19 Dec 2010 20:45:05 DEBUG Attempting to detect distro: Sun, 19 Dec 2010 20:45:05 DEBUG HTTP hasFile: didn't find http://172.16.0.100/iso/centos-5.5/.treeinfo Sun, 19 Dec 2010 20:45:05 DEBUG HTTP hasFile: didn't find http://172.16.0.100/iso/centos-5.5/Fedora Sun, 19 Dec 2010 20:45:05 DEBUG HTTP hasFile: didn't find http://172.16.0.100/iso/centos-5.5/Server Sun, 19 Dec 2010 20:45:05 DEBUG HTTP hasFile: didn't find http://172.16.0.100/iso/centos-5.5/Client Sun, 19 Dec 2010 20:45:05 DEBUG HTTP hasFile: didn't find http://172.16.0.100/iso/centos-5.5/RedHat Sun, 19 Dec 2010 20:45:05 DEBUG Detected a CentOS distro Sun, 19 Dec 2010 20:45:05 DEBUG Fetching URI: http://172.16.0.100/iso/centos-5.5/images/pxeboot/vmlinuz Sun, 19 Dec 2010 20:45:05 DEBUG Saved file to /var/lib/libvirt/boot/virtinst-vmlinuz.MKBsh1 Retrieving file vmlinuz... | 1.9 MB 00:00 Sun, 19 Dec 2010 20:45:05 DEBUG Fetching URI: http://172.16.0.100/iso/centos-5.5/images/pxeboot/initrd.img Sun, 19 Dec 2010 20:45:05 DEBUG Saved file to /var/lib/libvirt/boot/virtinst-initrd.img.T2dfhc Retrieving file initrd.img... | 7.7 MB 00:00 Sun, 19 Dec 2010 20:45:05 DEBUG Creating guest from: <domain type='qemu'> <name>test01</name> <currentMemory>524288</currentMemory> <memory>524288</memory> <uuid>5cbb288b-d9f7-bae4-0d05-9157553f53fe</uuid> <os> <type arch='x86_64'>hvm</type> <kernel>/var/lib/libvirt/boot/virtinst-vmlinuz.oddwKg</kernel> <initrd>/var/lib/libvirt/boot/virtinst-initrd.img.POxZ5X</initrd> <cmdline>method=http://172.16.0.100/iso/centos-5.5/ console=ttyS0 ks=http://172.16.0.100/ks/ks-vm.cfg</cmdline> </os> <features> <acpi/><apic/><pae/> </features> <clock offset="utc"/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <vcpu>1</vcpu> <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <console type='pty'/> <disk type='block' device='disk'> <driver name='qemu' cache='none'/> <source dev='/dev/vg_storage/test01'/> <target dev='hda' bus='ide'/> </disk> <interface type='bridge'> <source bridge='br0'/> <mac address='54:52:00:66:25:22'/> </interface> <input type='mouse' bus='ps2'/> </devices> </domain> Sun, 19 Dec 2010 20:44:48 DEBUG Removing /var/lib/libvirt/boot/virtinst-vmlinuz.oddwKg Sun, 19 Dec 2010 20:44:48 DEBUG Removing /var/lib/libvirt/boot/virtinst-initrd.img.POxZ5X Sun, 19 Dec 2010 20:44:48 ERROR internal error Domain ims-gl-lin01g01 didn't show up Domain installation may not have been successful. If it was, you can restart your domain by running 'virsh start test01'; otherwise, please restart your installation. Sun, 19 Dec 2010 20:44:48 ERROR internal error Domain test01 didn't show up Traceback (most recent call last): File "/usr/bin/virt-install", line 889, in ? main() File "/usr/bin/virt-install", line 751, in main start_time, guest.start_install) File "/usr/bin/virt-install", line 813, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error Domain ims-gl-lin01g01 didn't show up

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[libvirt-users] libvirt unavailable while a VM is in migration?
by Igor Serebryany 20 Dec '10

20 Dec '10

Hi, I am running libvirt 0.8.6 on qemu (kvm, really) 0.12.5. I have noticed that while a live migration is running, I cannot do anything else with libvirt -- even 'virsh list' blocks without output until the migration is almost done. (At that point 'virsh list' will dump a final screen showing the VM I just migrated as 'running'; the next run of 'virsh list' no longer displays the VM -- this is why I say "almost done".) Is there anything I can do to prevent this? Is there a fix for this coming? MORE DETAILS: I open a connection to a remote libvirt instance and begin a live-migration using: domain.migrate(remoteCon, flags, None, None, 0) My flags are: flags = libvirt.VIR_MIGRATE_PEER2PEER | libvirt.VIR_MIGRATE_LIVE | libvirt.VIR_MIGRATE_UNDEFINE_SOURCE | libvirt.VIR_MIGRATE_TUNNELLED Thanks, --Igor

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[libvirt-users] using virDomainMigrateSetMaxDowntime
by Igor Serebryany 20 Dec '10

20 Dec '10

I would like to use the virDomainMigrateSetMaxDowntime but I'm a bit confused about how to use it. If I try to set the downtime before I call domain.migrate(), I get the error "domain is not being migrated". But I cannot call it afterwards because domain.migrate() does not return until the migration has completed. Am I meant to put the call to domain.migrate() into a separate thread of control, and then call SetMaxDowntime from my main thread after the migration has begun? How do I even know if the migration has begun? Thanks! --Igor

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[libvirt-users] Problems Installing KVM Guest + Console Access
by tony＠specialistdevelopment.com 20 Dec '10

20 Dec '10

Hi, Im having real issues with getting a kvm guest up and running on CentOS 5.5 I have expanded the iso to a path on my system as I have been told that the -x (extra arguments) will not work with the -cdrom option, so I am now using -location, but still the extra arguments are not being picked up. So what do I need to do to get a guest up and working with console access to view the install as its driving me crazy. Thanks Tony

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[libvirt-users] pool info is not updated until pool refresh is run.
by Sharad Mishra 17 Dec '10

17 Dec '10

Hi, Creating a volume does not update pool information until pool-refresh is run. Here is an example - # virsh vol-create ShareStorage /tmp/vol.xml Vol sm_disk.dsk created from /tmp/vol.xml # virsh pool-info ShareStorage Name: ShareStorage UUID: 3ab7dbd5 State: running Capacity: 58.57 GB Allocation: 4.91 GB Available: 53.66 GB # virsh vol-info /var/lib/libvirt/test/sm_disk.dsk Name: sm_disk.dsk Type: file Capacity: 97.66 GB Allocation: 95.47 MB # virsh pool-refresh ShareStorage Pool ShareStorage refreshed # virsh pool-info ShareStorage Name: ShareStorage UUID: 3ab7dbd5 State: running Capacity: 58.57 GB Allocation: 5.01 GB Available: 53.57 GB Why pool-refresh is required to update pool-info? Thanks, Sharad Mishra

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[libvirt-users] aio flag for KVM guests
by Rangababu Chakravarthula 17 Dec '10

17 Dec '10

Hello, We are using libvirt 0.8.3 to build KVM guests (KVM version is qemu-kvm 0.12.5). I see kvm supports aio flag with either native or threads option. Where in libvirt XML should we define aio option? Thanks in advance Ranga

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[libvirt-users] busy loop in libvirtd (cpu usage 100%)
by Igor Serebryany 16 Dec '10

16 Dec '10

Hi! Occasionally of late, I've seen a few cases where libvirtd cpu usage shoots up to 100% and stays there indefinitely. This seems to happen when a QEMU VM is starting up, although on one occasion I *think* I saw it happen after a QEMU VM was p2p-migrated. Doing strace -f -p <libvirtd pid> reveals a flood of poll() functions calls like these: [pid 1690] poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}, {fd=12, events=POLLIN|POLLERR|POLLHUP}, {fd=11, events=POLLIN|POLLERR|POLLHUP}, {fd=10, events=POLLIN|POLLERR|POLLHUP}, {fd=9, events=POLLIN|POLLERR|POLLHUP}, {fd=24, events=POLLIN|POLLERR|POLLHUP}, {fd=21, events=POLLOUT}, {fd=14, events=POLLIN}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=17, events=POLLIN}, {fd=21, events=POLLIN|POLLERR|POLLHUP}, {fd=20, events=POLLIN|POLLERR|POLLHUP}], 14, -1) = 1 ([{fd=21, revents=POLLOUT}]) It seems that because 1 is returned each time, libvirtd just goes crazy dealing with fd-3, but I have no idea what fd-3 is. Restarting libvirtd fixes the high load, and then everything just goes back to chugging along as usual. This is on libvirt 0.8.5 with qemu 0.12.5 on a debian Squeeze system (the libvirt is compiled by hand). I'm not sure what's causing it, whether it's a bug in my own code somehow or inside libvirtd. I'd appreciate some help on how to debug this problem further -- restarting libvirtd is kind of a pain for me, because my application, which monitors the health on the node, maintains open connections to 'qemu:///system' and would thus have to restart itself as well... --Igor

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[libvirt-users] KVM Virtualisation, Console output no longer working
by tony＠specialistdevelopment.com 15 Dec '10

15 Dec '10

Hi, I used to use KVM for virtualisation and have now moved back to it, but I have a problem. When i used to install the guest machine with virt-install i used to use the -x "extra args" part to set the console for the install and guest, but it no longer works. Here is the command i use: virt-install -n server01 -r 512 --os-variant=virtio26 -c /isos/c5u5.iso --nographics --noautoconsole -f /storage/vm/server01 -s 5 bus=virtio -w bridge:br0 -x "console=ttyS0 ks=http://www.domain.com/c5u5.cfg" As you can see im setting the console to ttyS0, but then when i go to connect to the console with: virsh console server01 it either wont connect or comes up with: error: Failed to get local hostname Here is a dump of the xml, but no mention of ttyS0 either. <domain type='qemu' id='5'> <name>server01</name> <uuid>5991cf85-db6c-2b87-b76d-07a0caae77b9</uuid> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='rhel5.4.0'>hvm</type> <boot dev='cdrom'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' cache='none'/> <source file='/storage/vm/server01'/> <target dev='hda' bus='ide'/> </disk> <disk type='file' device='cdrom'> <source file='/isos/c5u5.iso'/> <target dev='hdc' bus='ide'/> <readonly/> </disk> <interface type='bridge'> <mac address='54:52:00:61:ea:78'/> <source bridge='br0'/> <target dev='vnet0'/> </interface> <serial type='pty'> <source path='/dev/pts/2'/> <target port='0'/> </serial> <console type='pty' tty='/dev/pts/2'> <source path='/dev/pts/2'/> <target port='0'/> </console> </devices> </domain> Can anyone shed any light on this as im totally stuck.

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