[ClusterLabs] DLM standalone without crm ?

[Christine Caulfield]

On 27/06/16 15:27, Lentes, Bernd wrote:
> 
> ----- Am 27. Jun 2016 um 9:04 schrieb Christine Caulfield ccaulfie at redhat.com:
> 
>> On 26/06/16 14:47, Lentes, Bernd wrote:
>>>
>>>
>>> ----- Am 26. Jun 2016 um 7:59 schrieb Ferenc Wágner wferi at niif.hu:
>>>
>>>> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> writes:
>>>>
>>>>> wferi at niif.hu writes:
>>>>>
>>>>>> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> writes:
>>>>>>
>>>>>>> is it possible to have a DLM running without CRM?
>>>>>>
>>>>>> Yes. You'll need to configure fencing, though, since by default DLM
>>>>>> will try to use stonithd (from Pacemaker). But DLM fencing didn't
>>>>>> handle fencing failures correctly for me, resulting in more nodes
>>>>>> being fenced until quorum was lost,
>>>>>
>>>>> do you have a howto ? Or is there one on the net ?
>>>>
>>>> dlm-controld has both a SysV init script and a systemd service file, you
>>>> can use either one to start it (they take care of mounting configfs and
>>>> loading the necessary kernel modules).  Just start it on your nodes when
>>>> you have quorum.
>>>
>>> Hi,
>>>
>>> i don't have neither an init-script nor a systemd service file.
>>> The only packages i find in the repositories concerning dlm are:
>>> libdlm3-3.00.01-0.31.87
>>> libdlm-3.00.01-0.31.87
>>> And i have a kernel module for dlm.
>>> Nothing else.
>>>
>>>
>>
>>
>> If you have that version of DLM then the cman package will have the
>> dlm_controld daemon and init scripts in it. With that version you can
>> run DLM without crm but not without cman. cman is required.
>>
>> Chrissie
>>
> 
> Hi Chrissie,
> 
> Isn't cman a crm ? Basically the same as pacemaker ?
> It seems in the end i have to use a crm.
> So i will try it directly with pacemaker, because i have a SuSE system,
> and cman is Red Hat stuff, isn't it ?
> 
>

Sorry, I didn't recognise the acronym CRM as a generic - I thought you
meant the crmd part of pacemaker.

Yes, DLM needs a cluster manager to work. With DLM3 that's usually cman,
if you want to do it under pacemaker then you might have to do more work
than you'd like. DLM4 should be fine though

Chrissie