Re: CephFS/Fuse : detect package upgrade to remount

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On Tue, Sep 8, 2015 at 2:33 PM, Florent B <florent@xxxxxxxxxxx> wrote:
>
>
> On 09/08/2015 03:26 PM, Gregory Farnum wrote:
>> On Fri, Sep 4, 2015 at 9:15 AM, Florent B <florent@xxxxxxxxxxx> wrote:
>>> Hi everyone,
>>>
>>> I would like to know if there is a way on Debian to detect an upgrade of
>>> ceph-fuse package, that "needs" remouting CephFS.
>>>
>>> When I upgrade my systems, I do a "aptitude update && aptitude
>>> safe-upgrade".
>>>
>>> When ceph-fuse package is upgraded, it would be nice to remount all
>>> CephFS points,  I suppose.
>>>
>>> Does someone did this ?
>> I'm not sure how this could work. It'd be nice to smoothly upgrade for
>> users, but
>> 1) We don't automatically restart the OSD or monitor daemons on
>> upgrade, because users want to control how many of their processes are
>> down at once (and the load spike of a rebooting OSD),
>> 2) I'm not sure how you could safely/cleanly restart a process that's
>> serving a filesystem. It's not like we can force users to stop using
>> the cephfs mountpoint and then reopen all their files after we reboot.
>> -Greg
>
> Hi Greg,
>
> I understand.
> It could be something like this : a command (or temp file) containing
> *running* version of CephFS (per mount point, or per system).
> Of course we can then get *installed* version of CephFS.
> And if different, umount&mount point.

I guess I don't see how that helps compared to just remembering when
you upgraded the package and comparing that to the running time of the
ceph-fuse process.
-Greg
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