[ClusterLabs] Corosync 3 release plans?

Christine Caulfield ccaulfie at redhat.com
Thu Sep 27 11:09:46 EDT 2018

On 27/09/18 16:01, Ken Gaillot wrote:
> On Thu, 2018-09-27 at 09:58 -0500, Ken Gaillot wrote:
>> On Thu, 2018-09-27 at 15:32 +0200, Ferenc Wágner wrote:
>>> Christine Caulfield <ccaulfie at redhat.com> writes:
>>>> TBH I would be quite happy to leave this to logrotate but the
>>>> message I
>>>> was getting here is that we need additional help from libqb. I'm
>>>> willing
>>>> to go with a consensus on this though
>>> Yes, to do a proper job logrotate has to have a way to get the log
>>> files
>>> reopened.  And applications can't do that without support from
>>> libqb,
>>> if
>>> I understood Honza right.
>> There are two related issues:
>> * Issue #142, about automatically rotating logs once they reach a
>> certain size, can be done with logrotate already. If it's a one-time
>> thing (e.g. running a test with trace), the admin can control
>> rotation
>> directly with logrotate --force /etc/logrotate.d/whatever.conf. If
>> it's
>> desired permanently, a maxsize or size line can be added to the
>> logrotate config (which, now that I think about it, would be a good
>> idea for the default pacemaker config).
>> * Issue #239, about the possibility of losing messages with
>> copytruncate, has a widely used, easily implemented, and robust
>> solution of using a signal to indicate reopening a log. logrotate is
>> then configured to rotate by moving the log to a new name, sending
>> the
>> signal, then compressing the old log.
> Regarding implementation in libqb's case, libqb would simply provide
> the API for reopening the log, and clients such as pacemaker would
> intercept the signal and call the API.

That sounds pretty easy to achieve. I'm also looking into high-res
timestamps for logfiles too.

> A minor complication is that pacemaker would have to supply different
> logrotate configs depending on the version of libqb available.

Can't you just intercept the signal anyway and not do anything if an old
libqb is linked in?


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