[ClusterLabs] Plea for a new DLM release and thoughts on its Pacemaker interface
wferi at niif.hu
wferi at niif.hu
Wed Jan 9 09:59:32 UTC 2019
David Teigland <teigland at redhat.com> writes:
> On Tue, Jan 08, 2019 at 11:56:18AM +0100, wferi at niif.hu wrote:
>> The DLM git repo accumulated a couple of patches over the 4.0.7 tag,
>> would you mind cutting a new release for packaging?
I found the ce1e4cc9 commit bumping the version, but neither a dlm-4.0.8
tag nor a new release tarball at https://releases.pagure.org/dlm/. Are
you holding those back for a reason, or don't you even plan to provide
>> And once we're at it: the STONITH helper embedding to SONAME of the
>> Pacemaker fencing library is pretty obscure and easy to miss on library
>> transitions. I guess it's done to avoid unconditionally pulling in
>> Pacemaker libraries and their dependencies. Don't you think this helper
>> agent had better be a part of the Pacemaker CLI utilities instead? In
>> my opinion the ABI coupling is stronger than the textual interface
>> dlm_controld uses. But even if not, it would be possible to dynamically
>> link the agent against the Pacemaker libraries and split it into a
>> separate optional package to make all those dependencies avoidable on
>> systems not using Pacemaker fencing. If all parties agree, of course.
> I wasn't aware of the difficulties. I'm open to suggestions as long as
> dlm_controld has a fence-agent-style binary to call.
I suggest using the stonith_api_time() and stonith_api_kick() functions
directly and linking against libstonithd explicitly. Yes, this would
require having the Pacemaker libraries around at install time, too, but
splitting the dlm_stonith binary into a separate package would nicely
counteract that, since dlm_stonith does nothing without those libraries,
so the dependency is already strict in the functional sense. And
explicit linkage would make this apparent for automatic tools.
Does dlm_controld react differently to dlm_stonith not being around and
it returning -ELIBACC/ENOSYS?
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