[Pacemaker] pacemaker RHEL6 with cman

Andrew Beekhof andrew at beekhof.net
Tue Mar 18 18:36:23 EDT 2014

On 19 Mar 2014, at 1:18 am, Leon Fauster <leonfauster at googlemail.com> wrote:

> Am 18.03.2014 um 00:02 schrieb Andrew Beekhof <andrew at beekhof.net>:
>> On 17 Mar 2014, at 11:26 pm, Gianluca Cecchi <gianluca.cecchi at gmail.com> wrote:
>>> On Mon, Mar 17, 2014 at 12:19 AM, Alex Samad - Yieldbroker wrote:
>>>> Hi
>>>> I am in the process of migrating away from the pcmk plugin for corosync and converting to cman.
>>>> So from what I gather its
>>>> Pacemaker -> cman -> corosync
>>>> Can I still configure corosync with /etc/corosync/corosync.conf
>>>> I want to change from multicast to udpu or is there a way to do that from crm or pcs ?
>>>> Alex
>>> Hello,
>>> is this for targeting the long run or for RHEL 6 itself?
>>> I ask because I found that in RH EL 7 beta docs it seems that actually
>>> cman is out completely and there is again corosync... ;-)
>> Even with "cman" you're still using corosync, just in a particular way.
>> Essentially cman is just a corosync plugin that exposes a specific API.
>> By having pacemaker use the cman API on RHEL6 we were able to minimise the support
>> overhead (since all the testing they do for rgmanager still applied), which is what
>> made it possible for pacemaker to become supported prior to RHEL7.
> this may be rational but the question is if the process from the point of the administration 
> will change in RHEL (dropped cman support??), despite cman's internal use of corosync right now.

"If you're using pcs, then you should hardly notice any difference."

> Even with the abstraction via pcs - the internals will change. This is 
> so far import to get the mental model correctly - literally this means 
> /etc/cluster/cluster.conf vs. /etc/corosync/corosync.conf or do i miss something?

There is no need to know about either file. Both are created/updated via pcs.
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