Open Stack

I'm not yet sure of the right way to do cleanup on shutdown, but any
driver should do as much checking as possible on startup - the service
might not have gone down cleanly (kill -9, SEGFAULT, etc), or
something might have gone wrong during clean shutdown. The driver
coming up should therefore not make any assumptions it doesn't
absolutely have to, but rather should check and attempt cleanup
itself, on startup.

On 3 April 2014 15:14, Deepak Shetty <dpkshetty at gmail.com> wrote:
>
> Hi,
>     I am looking to umount the glsuterfs shares that are mounted as part of
> gluster driver, when c-vol is being restarted or Ctrl-C'ed (as in devstack
> env) or when c-vol service is being shutdown.
>
> I tried to use __del__ in GlusterfsDriver(nfs.RemoteFsDriver) and it didn't
> work
>
> def __del__(self):
>         LOG.info(_("DPKS: Inside __del__ Hurray!, shares=%s")%
> self._mounted_shares)
>         for share in self._mounted_shares:
>             mount_path = self._get_mount_point_for_share(share)
>             command = ['umount', mount_path]
>             self._do_umount(command, True, share)
>
> self._mounted_shares is defined in the base class (RemoteFsDriver)
>
> ^C2014-04-03 13:29:55.547 INFO cinder.openstack.common.service [-] Caught
> SIGINT, stopping children
> 2014-04-03 13:29:55.548 INFO cinder.openstack.common.service [-] Caught
> SIGTERM, exiting
> 2014-04-03 13:29:55.550 INFO cinder.openstack.common.service [-] Caught
> SIGTERM, exiting
> 2014-04-03 13:29:55.560 INFO cinder.openstack.common.service [-] Waiting on
> 2 children to exit
> 2014-04-03 13:29:55.561 INFO cinder.openstack.common.service [-] Child 30185
> exited with status 1
> 2014-04-03 13:29:55.562 INFO cinder.volume.drivers.glusterfs [-] DPKS:
> Inside __del__ Hurray!, shares=[]
> 2014-04-03 13:29:55.563 INFO cinder.openstack.common.service [-] Child 30186
> exited with status 1
> Exception TypeError: "'NoneType' object is not callable" in <bound method
> GlusterfsDriver.__del__ of <cinder.volume.drivers.glusterfs.GlusterfsDriver
> object at 0x2777ed0>> ignored
> [stack at devstack-vm tempest]$
>
> So the _mounted_shares is empty ([]) which isn't true since I have 2
> glsuterfs shares mounted and when i print _mounted_shares in other parts of
> code, it does show me the right thing.. as below...
>
> From volume/drivers/glusterfs.py @ line 1062:
>     LOG.debug(_('Available shares: %s') % self._mounted_shares)
>
> which dumps the debugprint  as below...
>
> 2014-04-03 13:29:45.414 DEBUG cinder.volume.drivers.glusterfs
> [req-2cf69316-cc42-403a-96f1-90e8e77375aa None None] Available shares:
> [u'devstack-vm.localdomain:/gvol1', u'devstack-vm.localdomain:/gvol1'] from
> (pid=30185) _ensure_shares_mounted
> /opt/stack/cinder/cinder/volume/drivers/glusterfs.py:1061
>
> This brings in few Qs ( I am usign devstack env) ...
>
> 1) Is __del__ the right way to do cleanup for a cinder driver ? I have 2
> gluster backends setup, hence 2 cinder-volume instances, but i see __del__
> being called once only (as per above debug prints)
> 2) I tried atexit and registering a function to do the cleanup. Ctrl-C'ing
> c-vol (from screen ) gives the same issue.. shares is empty ([]), but this
> time i see that my atexit handler called twice (once for each backend)
> 3) In general, whats the right way to do cleanup inside cinder volume driver
> when a service is going down or being restarted ?
> 4) The solution should work in both devstack (ctrl-c to shutdown c-vol
> service) and production (where we do service restart c-vol)
>
> Would appreciate a response
>
> thanx,
> deepak
>
>
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>



-- 
Duncan Thomas