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Live block migration from Liberty compute nodes to Mitaka compute nodes gives "Permission denied" error.

asked 2017-06-17 11:22:29 -0500

Hi. I'm trying to live block migrate from compute nodes running Liberty, backing instance images with NFS, to Mitaka nodes using local disk to back the instances.

I am however running into the following error: 2017-06-17 18:13:17.894 143531 ERROR nova.virt.libvirt.driver [req-d0314c6e-e082-4741-892a-324363d1a799 aa476eb154b9400a91f2a72550359079 bc4b33b79c2741888cfc2cc0da7dede3 - - -] [instance: 24c8dbd4-5120-486e-abe4-edfa34f434cd] Live Migration failure: internal error: process exited while connecting to monitor: 2017-06-17T16:13:17.572056Z qemu-system-x86_64: -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-instance-0000023f/monitor.sock,server,nowait: Failed to unlink socket /var/lib/libvirt/qemu/domain-instance-0000023f/monitor.sock: Permission denied

The file /var/lib/libvirt/qemu/domain-instance-0000023f/monitor.sock does not exist, the running process is showing /var/lib/libvirt/qemu/instance-0000023f.monitor as the monitor path.

The process is running as user nova and /var/lib/libvirt/qemu is owned by nova.

I'm really stumped as to what the possible issue is, so I'd love some help and / or suggestions as to further troubleshooting steps.

Thanks, Martin

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answered 2017-06-19 19:04:48 -0500

luowei gravatar image

updated 2017-06-19 19:11:10 -0500

Did you configure for live migration? It requires, among other things, password-less ssh between compute nodes. See:

One way I've found to non-live migrate on Mitaka without setting up migrations is:

a) disable the compute nodes I dont wish to migrate to (hypervisor->compute host->disable service)
b) shelve the instance (wait for the shelving copy to complete)
c) unshelve the instance (it will be rebooted on one of the enabled compute nodes)
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On second thought, the document says "block migration" requires no additional configuration.

luowei gravatar imageluowei ( 2017-06-19 20:19:04 -0500 )edit

answered 2017-06-20 10:28:38 -0500

Thanks for the help! I tried to migrate to another compute-node which was commissioned using the same Salt state and it worked just my compute-node was borked for some reason.

Re-provisioned it and now it works as it should...

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Asked: 2017-06-17 11:21:29 -0500

Seen: 148 times

Last updated: Jun 20 '17