Re: Corosync 1 -> 2

Andrew Beekhof <[email protected]> Thu, 2 Oct 2014 08:06:11 +1000
Newsgroups	gmane.linux.highavailability.user
Message-ID	<[email protected]>
On 2 Oct 2014, at 12:44 am, Digimer <[email protected]> wrote:

> On 01/10/14 10:40 AM, Greg Woods wrote:
>> I notice that the "network:ha-clustering:Stable" repo for CentOS 6 now
>> contains Corosync 2.3.3-1 . I am currently running 1.4.1-17 . Is it safe to
>> just run this update? Are there configuration changes I have to make in
>> order for the new version to work? (If there is a document or wiki page
>> describing how to convert from Corosync 1 to 2, I would be happy to be
>> pointed to it).
>> 
>> Thanks,
>> --Greg
> 
> Personally, I would not upgrade. If you do, you will want to test outside of production first.
> 
> Corosync needed cman to be a quorum provider in the 1.x series. In 2.x, it became it's own quorum provider and cman was no longer needed. Last I heard upstream, pacemaker on EL6 is only supported on corosync 1.4 + cman. I'm sure you're not concerned about paid support, but it does mean that the corosync 1.4 stack is much better tested on EL6 than 2.x is.

Also keep in mind that the version of pacemaker that comes with CentOS 6 wont work with this version of corosync
You will need to rebuild it (or also obtain it from "network:ha-clustering:Stable" - which might not be automatic depending on what versions both have)

> 
> If you really want a corosync v2+, then I would recommend switching to CentOS 7.
> 
> -- 
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without access to education?
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