[kolla-ansible][xena] Cell database HA/redundancy?

Norrie, Andrew Andrew.Norrie at cgg.com
Fri Jun 3 12:53:13 UTC 2022


We are currently planning some large OpenStack deployments utilizing kolla-ansible and
I'm curious what folks are doing with the cell database HA/redundancy.

With kolla-ansible (xena) it appears that a loadbalancer setup is only allowed for the
default database shard (shard 0)... reference: https://docs.openstack.org/kolla-ansible/latest/reference/databases/mariadb-guide.html

If we are setting up separate cell database shards with Galera, I'm wondering if there is a convenient work-around or configuration for implementation of HA for these cell databases.

In the inventory group_vars directory you can specify the group variables (for each cell database) as:


but these aren't virtual IP hosts/addresses (non default db shard). This works perfectly fine with
a single server cell database but not Galera. If that db server goes down the cell instance information is lost.

Many thanks ... Andrew
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