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January 2016

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42 discussions

[libvirt-users] Hypervisor loses network connectivity
by Phill Edwards 04 Jan '16

04 Jan '16

I have been running KVM on a CentOS 7.1 host for a few months. I have one "main" host server plus a "backup" host server. Some time ago everything was running fine on "main", but all of a sudden the server became non-contactable on it's network interface. I could no longer SSH in and therefore couldn't run virt-manager. I don't know what caused this and I had to bring all the VMs up on "backup" and they've been running OK there ever since. Over the last few days I've rebuilt "main" and again all was going well and I migrated 4 of the 5 VMs back onto it. Then this morning I came to set up the final VM on "main" which is a Sophos firewall machine with 3 NICs (I have 3 physical NICs). Nothing uses 2 of the 3 NICs except the Sophos VM. I unplugged one of the ethernet cables from "backup" and plugged it into the 3rd NIC on "main" and all of a sudden "main" froze and again all network connectivity was lost. I rebooted it but the problem still remains that it's not contactable over the network and is therefore totally non-functional. When I log in at the console and run "ip a" I can see various network interfaces including br0 with the expected IP address - so it looks like it's got network connectivity but it hasn't. Has anyone else experienced this and know why it happens and how to fix it? I don't think I fancy rebuilding everything a 3rd time as it seems likely to happen again. Depending on why it's happening I'm thinking of moving off CentOS onto Ubuntu as the host OS, or moving away from KVM altogether. Thanks in advance for any help you can give.

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[libvirt-users] External snapshot warning.
by Dominique Ramaekers 03 Jan '16

03 Jan '16

Hi, If I make an external snapshot using the method of active block commit, I get these messages after the block commit: $virsh snapshot-create-as CmsrvAPP2 --name onderhoudscript --disk-only --atomic --quiesce --no-metadata Domein snapshot onderhoudscript is aangemaakt $virsh blockcommit CmsrvAPP2 vda --verbose --pivot 2016-01-03 18:14:52.784+0000: 15861: info : libvirt version: 1.2.16, package: 1.2.16-2ubuntu11.15.10.1 2016-01-03 18:14:52.784+0000: 15861: warning : virEventPollUpdateTimeout:268 : Ignoring invalid update timer -1 Successfully pivoted I've googled the 'invalid update timer -1' warning and found some messages about losing disk data after snapshot commits (using an other methode of snapshotting). I've done some tests with snapshotting, creating a file in the guest, doing the blockcommit. And I don't notice something weird. The only weird thing is: it only happens with one of the ten guests that run on the host... Should I worry about this? Greetings and thanks in advance, Dominique.

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