[ClusterLabs] agent ocf:pacemaker:controld

[Da Shi Cao]

I have to upgrade my OS to CentOS 7 to use GFS2 in a cluster of pacemaker+corosync. It's quite a straight forward path in CentOS 7.
What's next is to watch the performance closely and check if it is a good solution for us.

Thank you very much.
Dashi Cao

________________________________________
From: Eric Ren <zren at suse.com>
Sent: Friday, July 22, 2016 10:24:26 PM
To: Cluster Labs - All topics related to open-source clustering welcomed; Da Shi Cao
Subject: Re: [ClusterLabs] agent ocf:pacemaker:controld

Hello,

On 07/22/2016 02:14 PM, Da Shi Cao wrote:
> The manual "Pacemaker 1.1 Clusters from Scratch" gives the false impression that gfs2 relies only on dlm, but I cannot make it work without gfs_controld. Again this little daemon is heavily coupled with cman. I think it is quite hard to use gfs2 in a cluster build only using "pacemaker+corosync"! Am I wrong?

A big doubt is, why do you make everything from scratch rather than
having a try on a recent OS release?
No matter why, it's a good start point from trying out a distribution
that supports HA solution. Trust me,
it's very easy to setup a cluster filesystem (gfs2 or ocfs2) on openSUSE
or fedora.

Cheers,
Eric

>
> Thanks a lot!
> Dashi Cao
> ________________________________________
> From: Da Shi Cao <dscao999 at hotmail.com>
> Sent: Thursday, July 21, 2016 9:31:51 PM
> To: Cluster Labs - All topics related to open-source clustering welcomed
> Subject: Re: [ClusterLabs] agent ocf:pacemaker:controld
>
> I've built the dlm_tool suite using the source from https://git.fedorahosted.org/cgit/dlm.git/log/.  The resource uisng ocf:pacemaker:controld will always fail to start because of timeout, even if start timeout is set to 120s! But if dlm_controld is first started outside the cluster management,  then the resource will show up and stay well!
>
> Another question is what's the difference of dlm_controld and gfs_controld? Must they both be present if a cluster gfs file system is mounted?
>
> Thanks a lot!
> Dashi Cao
> ________________________________________
> From: Da Shi Cao <dscao999 at hotmail.com>
> Sent: Wednesday, July 20, 2016 4:47:31 PM
> To: Cluster Labs - All topics related to open-source clustering welcomed
> Subject: Re: [ClusterLabs] agent ocf:pacemaker:controld
>
> Thank you all for the information about dlm_controld. I will make a try using https://git.fedorahosted.org/cgit/dlm.git/log/ .
>
> Dashi Cao
>
> ________________________________________
> From: Jan Pokorný <jpokorny at redhat.com>
> Sent: Monday, July 18, 2016 8:47:50 PM
> To: Cluster Labs - All topics related to open-source clustering welcomed
> Subject: Re: [ClusterLabs] agent ocf:pacemaker:controld
>
>> On 18/07/16 07:59, Da Shi Cao wrote:
>>> dlm_controld is very tightly coupled with cman.
> Wrong assumption.
>
> In fact, support for shipping ocf:pacemaker:controld has been
> explicitly restricted to cases when CMAN logic (specifically the
> respective handle-all initscript that is in turn, in that limited use
> case, triggered from pacemaker's proper one and, moreover, takes
> care of dlm_controld management on its own so any subsequent attempts
> to do the same would be ineffective) is _not_ around:
>
> https://github.com/ClusterLabs/pacemaker/commit/6a11d2069dcaa57b445f73b52f642f694e55caf3
> (accidental syntactical typos were fixed later on:
> https://github.com/ClusterLabs/pacemaker/commit/aa5509df412cb9ea39ae3d3918e0c66c326cda77)
>
>>> I have built a cluster purely with
>>> pacemaker+corosync+fence_sanlock. But if agent
>>> ocf:pacemaker:controld is desired, dlm_controld must exist! I can
>>> only find it in cman.
>>> Can the command dlm_controld be obtained without bringing in cman?
> To recap what others have suggested:
>
> On 18/07/16 08:57 +0100, Christine Caulfield wrote:
>> There should be a package called 'dlm' that has a dlm_controld suitable
>> for use with pacemaker.
> On 18/07/16 17:26 +0800, Eric Ren wrote:
>> DLM upstream hosted here:
>>    https://git.fedorahosted.org/cgit/dlm.git/log/
>>
>> The name of DLM on openSUSE is libdlm.
> --
> Jan (Poki)
>
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