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[kolla] How to recover MariaDB if there's a controller failed to boot?

On Mon, Nov 16, 2020 at 3:52 AM Eddie Yen <missile0407 at> wrote:
> Hi everyone,

Hi Eddie!

> We met an issue few days ago. When we launch Openstack cluster, we found
> that there's a controller couldn't boot up caused by hardware failure, And MariaDB
> lost sync after left controllers booted into system.
> In this case, Can I just mark down the failed controller hostname in inventory file and
> do mariadb_recovery? Any risk after do this after failure one back online?

It is supposed to be used like you are saying.
As long as the alive controllers have all the data you need, it will work fine.
They should if they were up before failure.
The failed one will either be unable to rejoin the cluster or just
follow the others.
It depends on its local state.
It will not impose its state on others so it is safe to turn it on and
then fix it.

(All the above assumes standard configuration)

> Many thanks,
> Eddie.