History

Pete Birley f57972b5b6 dependencies: move static dependencies under a 'static' key This PS moves static dependencies under a 'static' key to allow expansion to cover dynamic dependencies. Change-Id: I38990b93aa79fa1f70af6f2c78e5e5c61c63f32c		2018-02-23 12:31:15 -08:00
..
templates	dependencies: move static dependencies under a 'static' key	2018-02-23 12:31:15 -08:00
.helmignore	Adding MariaDB	2016-11-18 16:34:36 +01:00
Chart.yaml	Mariadb: Update to use endpoint values layout and lookups	2017-07-03 13:17:48 +00:00
README.rst	Update remaining markdown docs to RST	2017-05-22 10:56:51 +02:00
requirements.yaml	Rename common chart, and update all references to functions within it. (#167 )	2017-02-14 16:52:38 -08:00
values.yaml	dependencies: move static dependencies under a 'static' key	2018-02-23 12:31:15 -08:00

README.rst

openstack-helm/mariadb

By default, this chart creates a 3-member mariadb galera cluster.

This chart leverages StatefulSets, with persistent storage.

It creates a job that acts as a temporary standalone galera cluster. This host is bootstrapped with authentication and then the WSREP bindings are exposed publicly. The cluster members being StatefulSets are provisioned one at a time. The first host must be marked as Ready before the next host will be provisioned. This is determined by the readinessProbes which actually validate that MySQL is up and responsive.

The configuration leverages xtrabackup-v2 for synchronization. This may later be augmented to leverage rsync which has some benefits.

Once the seed job completes, which completes only when galera reports that it is Synced and all cluster members are reporting in thus matching the cluster count according to the job to the replica count in the helm values configuration, the job is terminated. When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints. It is only when the job is running that the cluster members leverage the seed job as their gcomm endpoint. This ensures you can restart members and scale the cluster.

The StatefulSets all leverage PVCs to provide stateful storage to /var/lib/mysql.

You must ensure that your control nodes that should receive mariadb instances are labeled with openstack-control-plane=enabled, or whatever you have configured in values.yaml for the label configuration:

kubectl label nodes openstack-control-plane=enabled --all