[ovirt-users] migration failed with permission denied

[Fabrice Bacchella]

I'm running an up to date ovirt setup.

I tried to put an host in maintenance mode, with one VM running on it.

It failed with this message in vdsm.log:

Thread-351083::ERROR::2016-06-17 11:30:04,732::migration::209::virt.vm::(_recover) vmId=`b82209c9-42ff-457c-bb98-b6a2034833fc`::internal error: process exited while connecting to monitor: 2016-06-17T09:30:04.429323Z qemu-kvm: -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/b82209c9-42ff-457c-bb98-b6a2034833fc.com.redhat.rhevm.vdsm,server,nowait: Failed to bind socket to /var/lib/libvirt/qemu/channels/b82209c9-42ff-457c-bb98-b6a2034833fc.com.redhat.rhevm.vdsm: Permission denied
...
Traceback (most recent call last):
  File "/usr/share/vdsm/virt/migration.py", line 298, in run
    self._startUnderlyingMigration(time.time())
  File "/usr/share/vdsm/virt/migration.py", line 364, in _startUnderlyingMigration
    self._perform_migration(duri, muri)
  File "/usr/share/vdsm/virt/migration.py", line 403, in _perform_migration
    self._vm._dom.migrateToURI3(duri, params, flags)
  File "/usr/share/vdsm/virt/virdomain.py", line 68, in f
    ret = attr(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", line 124, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 1313, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1836, in migrateToURI3
    if ret == -1: raise libvirtError ('virDomainMigrateToURI3() failed', dom=self)
libvirtError: internal error: process exited while connecting to monitor: 2016-06-17T09:30:04.429323Z qemu-kvm: -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/b82209c9-42ff-457c-bb98-b6a2034833fc.com.redhat.rhevm.vdsm,server,nowait: Failed to bind socket to /var/lib/libvirt/qemu/channels/b82209c9-42ff-457c-bb98-b6a2034833fc.com.redhat.rhevm.vdsm: Permission denied

If i check the file, I see :

srwxrwxr-x 1 qemu qemu 0 May 31 16:21 /var/lib/libvirt/qemu/channels/b82209c9-42ff-457c-bb98-b6a2034833fc.com.redhat.rhevm.vdsm

And on all my hosts, the permissions are the same:
srwxrwxr-x 1 qemu qemu /var/lib/libvirt/qemu/channels/*

And vdsm is running vdsm:
4 S vdsm      3816     1  0  60 -20 - 947345 poll_s May25 ?       02:21:58 /usr/bin/python /usr/share/vdsm/vdsm

If I check vdsm groups:
~# id vdsm
uid=36(vdsm) gid=36(kvm) groups=36(kvm),179(sanlock),107(qemu)




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