[Pacemaker] Build dlm_controld for pacemaker stack (dlm_controld.pcmk)

[David Vossel]

----- Original Message -----
> From: "Bernardo Cabezas Serra" <bcabezas at apsl.net>
> To: pacemaker at oss.clusterlabs.org
> Sent: Monday, October 29, 2012 11:51:51 AM
> Subject: [Pacemaker] Build dlm_controld for pacemaker stack	(dlm_controld.pcmk)
> 
> 
> Hello,
> 
> disclaimer: I have posted this issue to linux-ha list too a couple of
> days ago. I'm sorry if this is not the correct list, and thanks if
> you can give me a hint about which cluster stack should I use for
> ocfs2 by now.
> 
> I'm trying to compile all stack for corosync + pacemaker + dlm +
> ocfs2 (with dlm_controld.pmk), without cman stack. I'm following the
> "From source" Pacemaker guide.
> 
> After some days trying to compile the correct combination of
> sources/versions, I have no success, and I'm not sure if at this
> moment this is possible.
> 
> The fist problem was that cluster removed support for dlm_controld
> with pacemaker stack. Last version with support was 3.0.17.
> But this was done some years ago, and as far as I have been able to
> understand, things are still broken.
> 
> 
> The most relevant info found about this issue are these threads from
> Andrew Beekhof and Vladislav Bogdanov, wich suggest to compile
> dlm_controld from Cluster, applying some patches. They report it
> worked (whith some remaining issues):
> 
> http://oss.clusterlabs.org/pipermail/pacemaker/2009-October/003064.html
> http://www.mail-archive.com/pacemaker@oss.clusterlabs.org/msg09959.html
> 
> But most recent issue about this is a year ago, and seems that things
> are still broken.
> I haven't been able to compile, with lots of errors, so I'm currently
> asking if this is the right way, becouse seems that nobody else is
> willing to use this...
> 
> 
> At cluster page, they state that now DLM code has been separated from
> cluster:
> https://fedorahosted.org/cluster/wiki/HomePage
> 
> But this dlm project (that seems to have pcmk support), depends on
> corosync 2.0, so it can't run with last pacemaker (1.1.8). (can it?)
> http://git.fedorahosted.org/git/dlm.git
>
> Before spending more time with this, I wanted to ask for the right
> way to do things.
> So Questions are:
> 
> (1) Is it by now possible to get an ocfs2 corosync + pacemaker
> cluster, without cman, and dlm_controld with pcmk stack? (if yes
> which repos/versions)?

I don't know about ocfs2, but using the dlm without cman is definitely possible right now.  It should work. I tried it out a few months ago.  We even have a tutorial outlining how to do gfs2 + dlm + pacemaker 1.1.8 + corosync 2.0.  http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Clusters_from_Scratch/  Take a look at the active/active section.

Hope that helps.

-- Vossel

> (2) What is the future roadmap about this? Will future corosync2.0
> cluster have dlm issues addressed?
> 
> Also, I have read (also Andrew post) that OCFS2 cluster could have
> problems on top of corosync 2.0, as OCFS2 has't ben ported (GFS2 was
> ported).
> http://www.gossamer-threads.com/lists/linuxha/pacemaker/78538
> so:
> (3) Is GSF2 a better future option in terms of support, for linux-ha
> clusters?
> 
> 
> More details about pcmk dlm_controld:
> I found that Suse have always been mantaining cman-free cluster
> stack, so I have tried to find dlm in its packages.
> Found:
> http://rpmfind.net//linux/RPM/opensuse/factory/x86_64/libdlm-3.00.01-24.5.x86_64.html
> 
> But also I have had lots of compilation problems, trying several
> pacemaker, versions, also the suse-patched ones. Haven't been able
> to successfully complie a dlm_controld.
> 
> 
> Thanks and Regards,
> Bernardo
> --
> APSL
> 	APSL
> 	Bernardo Cabezas Serra
> Responsable Sistemas
> 	Ada Byron, edificio NTIC 2ºA
> 07121 ParcBit
> 	Mail: bcabezas at apsl.net
> Skype: bernat.cabezas
> Tel: 971439771
> 
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