Just to complement Danny's comment: this applies to any kind of distributed cluster; if you have an even number of members or only one member in a cluster that requires a quorum to work, you will be prone to a split-brain situation. So it's not safe for production. https://en.wikipedia.org/wiki/Split-brain_(computing) Cheers! On Thu, Mar 16, 2023 at 12:12 PM Danny Webb <Danny.Webb at thehutgroup.com> wrote: > You can't do 2 control nodes with kolla as you need an odd number of > mariadb nodes for quorum purposes (1 or 3 or more). > ------------------------------ > *From:* kaqiu pi <thremes172 at gmail.com> > *Sent:* 16 March 2023 17:05 > *To:* openstack-discuss at lists.openstack.org < > openstack-discuss at lists.openstack.org> > *Subject:* Fwd: [kolla-ansible] Whether the cluster of two control nodes > is available > > > * CAUTION: This email originates from outside THG * > ------------------------------ > Hi， > > I'm a newer in kolla-ansibe. And I could deploy a cluster of two controll > nodes by kolla-ansible. But I don't konw whether the cluster is anvailable? > > I would like to ask, when the number of control nodes is 2, the status of > mariadb and rabbitmq clusters, are they safe and available for production? > > Thanks for any guidance. > Good Luck > > *Danny Webb* > Principal OpenStack Engineer > Danny.Webb at thehutgroup.com > [image: THG Ingenuity Logo] <https://www.thg.com> > <https://www.linkedin.com/company/thgplc/?originalSubdomain=uk> > <https://twitter.com/thgplc?lang=en> > -- Alvaro Soto *Note: My work hours may not be your work hours. Please do not feel the need to respond during a time that is not convenient for you.* ---------------------------------------------------------- Great people talk about ideas, ordinary people talk about things, small people talk... about other people. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.openstack.org/pipermail/openstack-discuss/attachments/20230316/a2a21637/attachment-0001.htm>