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[libvirt-users] removing virbr0
by Andrei Perietanu 10 Mar '16

10 Mar '16

I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when installing libvirt you get a 'default network' which adds a 'vrbr0'. I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place. I am compiling libvirt from source so I would think there is some compile time option or some configuration file I need to change for the default network not to be included. Thanks for your help! Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.

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[libvirt-users] different uuids, but still "Attempt to migrate guest to same host" error
by Devin Reade 10 Mar '16

10 Mar '16

Background: ---------- I'm trying to debug a two-node pacemaker/corosync cluster where I want to be able to do live migration of KVM/qemu VMs. Storage is backed via dual-primary DRBD (yes, fencing is in place). When moving the VM between nodes via 'pcs resource move RES NODENAME', the live migration fails although pacemaker will shut down the VM and restart it on the other node. For the purpose of diagnosing things, on both nodes I've put SELinux into permissive mode and disabled firewalld. Interesting Bit: --------------- Debugging a bit further, I put the VM into an unmanaged state and then try with virsh, from the node currently running the VM: [root@node1 ~]# virsh migrate --live --verbose testvm qemu+ssh://node2/system error: internal error: Attempt to migrate guest to the same host node1.example.tld A quick google points toward uuid problems, however the two nodes are, afaict, working with different UUIDs. (Substantiating info shown toward the end.) I thought that since `hostname` only returns the node name and not the FQDN that perhaps there was internal qemu confusion about using the short node name vs FQDN. However fully qualifying it made no difference: [root@node1 ~]# virsh migrate --live --verbose testvm qemu+ssh://node2.example.tld/system error: internal error: Attempt to migrate guest to the same host node1.example.tld Running virsh with a debug level of 1 doesn't reveal anything interesting that I can see. Running libvirtd at that level shows that node2 is seeing node1.example.tld in the emitted XML in qemuMigrationPrepareDirect. I'm assuming that means the wrong node has been calculated somewhere prior to that. At this point I'm grasping at straws and looking for ideas. Does anyone have a clue-bat? Devin Config Info Follows: ------------------- CentOS Linux release 7.2.1511 (Core) libvirt on both nodes is 1.2.17-13 [root@node1 ~]# virsh sysinfo | grep uuid <entry name='uuid'>03DE0294-0480-05A4-B906-8E0700080009</entry> [root@node2 ~]# virsh sysinfo | grep uuid <entry name='uuid'>03DE0294-0480-05A4-B206-320700080009</entry> [root@node1 ~]# dmidecode -s system-uuid 03DE0294-0480-05A4-B906-8E0700080009 [root@node2 ~]# dmidecode -s system-uuid 03DE0294-0480-05A4-B206-320700080009 [root@node1 ~]# fgrep uuid /etc/libvirt/libvirtd.conf | grep -v '#' host_uuid = "875cb1a3-437c-4cb5-a3de-9789d0233e4b" [root@node2 ~]# fgrep uuid /etc/libvirt/libvirtd.conf | grep -v '#' host_uuid = "643c0ef4-bb46-4dc9-9f91-13dda8d9aa33" [root@node2 ~]# pcs config show ... Resource: testvm (class=ocf provider=heartbeat type=VirtualDomain) Attributes: hypervisor=qemu:///system config=/cluster/config/libvirt/qemu/testvm.xml migration_transport=ssh Meta Attrs: allow-migrate=true is-managed=false Operations: start interval=0s timeout=120 (testvm-start-interval-0s) stop interval=0s timeout=240 (testvm-stop-interval-0s) monitor interval=10 timeout=30 (testvm-monitor-interval-10) migrate_from interval=0 timeout=60s (testvm-migrate_from-interval-0) migrate_to interval=0 timeout=120s (testvm-migrate_to-interval-0) ... (The /cluster/config directory is a shared GlusterFS filesystem.) [root@node1 ~]# cat /etc/hosts | grep -v localhost 192.168.10.8 node1.example.tld node2 192.168.10.9 node2.example.tld node2 192.168.11.8 node1hb.example.tld node1hb 192.168.11.9 node2hb.example.tld node2hb (node1 and node2 are the "reachable" IPs and totem ring1. node1hb and node2hb form a direct connection via crossover cable for DRBD and totem ring0.)

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[libvirt-users] How to test if a console session is active?
by Peter Steele 10 Mar '16

10 Mar '16

I use libvirt to manage a container based environment. Is there an efficient method for testing if someone has a console session open for a given container? The approach I'm using at the moment is to use lsof and check if there is an entry for the container's console pts device. For example, I can determine a container's console device from its xml definition: # virsh dumpxml vm-00|grep -A 4 pty <console type='pty' tty='/dev/pts/3'> <source path='/dev/pts/3'/> <target type='lxc' port='0'/> <alias name='console0'/> </console> Once I have pts device, I can do something like # if lsof /dev/pts/3; then echo "Container vm-00 has an active console session"; fi This all works fine but we've found that lsof is very expensive. Is there a more efficient means to make this active console check? Peter

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[libvirt-users] Problems creating a LXC rootfs to be used with virt-manager
by Markus Rhonheimer 09 Mar '16

09 Mar '16

Hello everyone, Laine Stump over at OFTC #virt was kind enough to point me to this email address. I am trying to run a LXC OS container with virt-manager and found out, that I need to create the rootfs with LXC/LXD and then point virt-manager to the rootfs location. ( I am running Ubuntu 16.04 inside a virtual machine [kvm] for testing) Both "lxc-create" and "lxc launch" worked to create the rootfs and run the VMs. When I tried to add them to virt-manager I always get error messages like this: https://postimg.org/image/lkqn1ery5/ the configuration looks like this: http://pastebin.com/fg1JFCRX I would appreciate any help. kind regards, Markus

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[libvirt-users] unable to create preallocated image with gluster protocol
by SATHEESARAN 09 Mar '16

09 Mar '16

Hi All, When I tried to create preallocated image with gluster , I am unable to create one The image gets created but not preallocated. [root@ ]# qemu-img create -f qcow2 -o preallocation=full gluster://host1.lab.eng.blr.redhat.com/rep3vol/vm3.img 3G Formatting 'gluster://dhcp37-61.lab.eng.blr.redhat.com/rep3vol/newvm3.img', fmt=qcow2 size=3221225472 encryption=off cluster_size=65536 preallocation='full' Unknown option 'preallocation' Is it a known issue ? -- Satheesaran S

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[libvirt-users] (no subject)
by nidhi d 08 Mar '16

08 Mar '16

How do i add a new rpc to the existing code ?

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[libvirt-users] How to measure memory utilizatin of guest when dommemstat reports "RSS" is more than "ACTUAL"?
by suyog jadhav 08 Mar '16

08 Mar '16

How to measure memory utilizatin of guest when dommemstat reports "RSS" is more than "ACTUAL"? Following is the output on RHEL 6.6 # dommemstat 1 actual 16777216 rss 16890372 # dommemstat 2 actual 16777216 rss 16460516 I found following article on Redhat which suggests that this is normal/expected? https://access.redhat.com/solutions/2017943 Now we use following formula to calculate the memory utilization. mem_util = (rss/actual)*100 now this gives more that 100% as the result. We use the libvirt library to call the virDomainMemoryStats. (which is the same used by the "virsh dommemstat" command) If we can't use the RSS as the "used memory", what else should be used to calculate the same? What is the ideal approach to report memory utilization of guest from the KVM host?

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[libvirt-users] Compiling qemu
by Dominique Ramaekers 08 Mar '16

08 Mar '16

Hi, I've installed qemu 2.5 through the package manager. There is a bug which blocks making an external snapshot for the second time. A fix is released: https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg06163.html I thought, why not download the source, apply the patch, build + make and then copy qemu-system-x86_64 to the /usr/bin/ folder..... But if I do 'virsh start my_vm', I get these errors: fout: internal error: early end of file from monitor, possible problem: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2] warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2] qemu: could not load PC BIOS 'bios-256k.bin' First: What can I do about the 'host doesn't support requested feature'? Second: I think the compiled binary doesn't look for the bios-256k.bin in the right place? Help wil be much apreciated... Greetings, Dominique.

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[libvirt-users] Traffic mirroring
by Renich Bon Ciric 07 Mar '16

07 Mar '16

Hello, We're interested in mirroring traffic from a host's guests to another host's guest. We've been able to achieve that on the same host; redirecting traffic from the host's bridge interface (VLAN) to one of the guest's in the same host by using the tc command. But, when it comes to traffic from one host to the other, we haven't been able to pull it through. Please, check out this image: http://ctrlv.in/720433 In this case, we are able to mirror the traffic from host11 into the Ubuntu guest; but not the traffic from host10 or host9 into the Ubuntu guest on host11. Any help regarding this is appreciated. Thank you. -- Renich Bon Ciric Operations | CloudSigma ==================== This email is from CLOUDSIGMA AG. The contents of this email and any attachments are confidential to the intended recipient. They may not be disclosed to or used by or copied in any way by anyone other than the intended recipient. If this email is received in error, please contact CLOUDSIGMA AG on +41 (0)44 585 39 07 quoting the name of the sender and the email address to which it has been sent and then delete it. Please note that neither CLOUDSIGMA AG nor the sender accepts any responsibility for viruses and it is your responsibility to scan or otherwise check this email and any attachments. CLOUDSIGMA AG is a public limited company registered in Canton Zürich, Switzerland (registered number CH-020.3.034.422-0) with registered offices at Badenerstrasse 549, 8048 Zurich, Switzerland. For further information, please refer to www.cloudsigma.com . ====================

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[libvirt-users] Convincing libvirt to create a bridge device?
by Lars Kellogg-Stedman 07 Mar '16

07 Mar '16

I was hoping that I could delegate creation of bridge devices to libvirt for address-less bridges, in order to not have to deal with the various ways distributions handle persistent network configuration, but while this creates a libvirt network... <network> <name>provision</name> <forward mode='bridge'/> <bridge name='brprov'/> </network> ...it doesn't actually create the bridge. Configuring the bridge using either <forward mode="route"/> or <forward mode="nat"/> *will* create the bridge device, but both of these require assigning an address to the bridge which means I have to suddenly worry about IPAM and conflicts with local networks. I look at the various interface-related commands, and there is an "iface-bridge" command but this requires a physical interface. Is there any way to convince libvirt to create the bridge device for a <forward mode='bridge'/> network? -- Lars Kellogg-Stedman <lars(a)redhat.com> | larsks @ {freenode,twitter,github} Cloud Engineering / OpenStack | http://blog.oddbit.com/

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