[rdo-list] tripleo ha topology

Raoul Scarazzini rasca at redhat.com
Thu Dec 15 08:32:31 UTC 2016

On 14/12/2016 22:59, Dotan, Alon wrote:
> Hey,
> Some can provide link or explanation about the use of haproxy and
> pacemaker together in tripleo?
> Why need pcs if there is galera and haproxy?

Galera is managed via a specific resource agent which takes care of all
the stuff needed to start, stop and, most of all, recover. It automates
a lot of tasks which otherwise will be manual.

Haproxy is managed by Pacemaker because of the Vips. There are specific
constraints that ensures that whether a Vip change the host, haproxy
service will follow.

Hope this helps,

Raoul Scarazzini
rasca at redhat.com

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