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

Wed Oct 31 23:47:59 UTC 2012

On Tue, Oct 30, 2012 at 5:33 PM, Vladislav Bogdanov
<bubble at hoster-ok.com> wrote:
> 29.10.2012 22:10, David Vossel wrote:
>>
>>
>> ----- 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.
>
> One remark about that - it requires that gfs2 communicates with dlm in
> the kernel space - so gfs_controld is not longer required. I think
> Fedora 17 is the first version with that feature. And it is definitely
> not available for EL6 (centos6 which I use).
>
> But I have preliminary success running GFS2 with corosync2 and pacemaker
> 1.1.8 on EL6. dlm4 runs just fine as is (although it misses some
> featured on EL6 because of kernel). And it still includes (not
> documented) option enable_fscontrol, so user-space communication with fs
> control daemons is supported. Even it that feature will be removed
> upstream, it can be easily returned back - just several lines of code.
> And I ported gfs_controld from cman to corosync2 (patch is very dirty
> yet, made with scissors and needle, just a proof-of-concept that it even
> can work). Some features are unsupported (f.e. nodir) and will not be
> implemented by me.

I'm impressed.  What was the motivation though?  You really really
don't like CMAN? :-)

> I can send that patch here for those who interested. I think the same
> method may apply to ocfs2 (I'm allergic to it so I wont even look).
>
> Vladislav
>
>>
>> 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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>>>
>>>
>>>
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>
>
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