Issues with devstack on both Fedora 17 and 18

[Matthias Runge]

On 02/10/2013 10:08 PM, Alan Pevec wrote:
> 2013/2/8 Kyle Mestery (kmestery) <kmestery at cisco.com>:
>> It's definitely namespace related. When I turned namespaces off in my localrc,
>> DBus stayed up and things worked ok. Now the digging on how they two are
>> interacting in such a destructive way can begin!
> 
> Maybe https://bugzilla.redhat.com/show_bug.cgi?id=882047 ?
Sounds like.

Some observations:

- this has nothing to do especially with devstack, this also happens
e.g. on f18.
- it is caused by quantum calling internally ip netns exec
- ip remounts /sys and destroys /sys/cgroups
- systemctl tries to access /sys/cgroups and returns that misleading
error message:
Failed to get D-Bus connection: No connection to service manager.
- no ability to shut down the system cleanly anymore.

So, I think, these are at least two errors:
- ip remounting /sys and destroying the hierarchy below that mountpoint
- (at least) misleading error message from systemctl. My proposal here
would be to try to remount /sys/cgroups etc. because this error might
happen even by accident

Matthias


-- 
Matthias Runge <mrunge at matthias-runge.de>
               <mrunge at fedoraproject.org>