[Openstack] [kolla][ubuntu][libvirt] Is libvirt 2.5.0 in ubuntu cloud archive ocata repo bust

Jeffrey Zhang zhang.lei.fly at gmail.com
Wed Mar 8 03:28:44 UTC 2017

Kolla deploy ubuntu gate is red now. here is the related bug[0].

libvirt failed to access the console.log file when booting instance. After
made some debugging, i got following.

# how console.log works
nova create a empty console.log with nova:nova ( this is another bug
workaround actually[1]), then libvirt ( running with root ) will change the
file owner to qemu process user/group ( configured by dynamic_ownership ).
Now qemu process can write logs into this file.

# what's wrong now
libvirt 2.5.0 stop change the file owner, then qemu/libvirt failed to write
logs into console.log file

# other test

* ubuntu + fallback libvirt 1.3.x works [2]
* ubuntu + libvirt 2.5.0 + chang the qemu process user/group to
  nova:nova works, too.[3]
* centos + libvirt 2.0.0 works, never saw such issue in centos.

# conclusion
I guess there are something wrong in libvirt 2.5.0 with dynamic_ownership

[0] https://bugs.launchpad.net/kolla-ansible/+bug/1668654
[2] https://review.openstack.org/442673
[3] https://review.openstack.org/442850

Jeffrey Zhang
Blog: http://xcodest.me
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