MariaDB in Kolla-Kubernetes

Overview

`MariaDB <https://mariadb.org/>_ is the default persistant storage option for `a Kolla-Kubernetes cluster.

Preparation and Deployment

MariaDB is self-sufficent, thus it’s one of the first things you want to start while installing.

MariaDB must be boostrapped to set up the on-disk data structure before the process can start. To bootstrap MariaDB:

kolla-kubernetes bootstrap mariadb

To create the Replication Controller that will keep MariaDB running after boostrap has completed:

kolla-kubernetes run mariadb

Verify Operation

To find the database password:

grep ^database_password /etc/kolla/passwords.yml

To find the IP address of the kubernetes service so you can test for functionality on a machine inside of the Kubernetes cluster (e.g. running Kube-proxy) but not running as a container:

kubectl get svc mariadb

Once you know the IP address and password, you can check to see if a mysql client running on a machine by appending the IP address to this command (e.g. -h 192.0.2.0):

mysql -p -u root -h <ip_address>

Debug an Instance

MariaDB is configured to store it’s database on the host at /var/lib/mysql. If there’s contents from previous runs located there, the bootstrap will fail.