openstack/openstack-helm-infra
Code Issues Proposed changes
dece008337
openstack-helm-infra/mariadb
History
Pete Birley 2abf62ff4d OSH-Infra: Add emptydirs for tmp 
This PS adds emptydirs backing the /tmp directory in pods, which
is required in most cases for full operation when using a read only
filesystem backing the container.

Additionally some yaml indent issues are resolved.

Change-Id: I8b7f1614da059783254aa6efc09facf23fca3cad
Signed-off-by: Pete Birley <pete@port.direct>
2019-04-20 20:50:59 +00:00
..
files 'NOP' cleanup for more consistent white-space use in charts 2019-01-03 22:45:49 +00:00
templates OSH-Infra: Add emptydirs for tmp 2019-04-20 20:50:59 +00:00
.helmignore MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
Chart.yaml MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
README.rst MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
requirements.yaml MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
values.yaml Merge "Mariadb: Disable monitoring by default" 2019-04-16 21:26:40 +00:00

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 When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints.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