openstack/openstack-helm-infra
Code Issues Proposed changes
ae91cf3fc3
openstack-helm-infra/mariadb
History
Vladimir Kozhukalov ae91cf3fc3 Use deploy-env role for all deployment jobs 
To make it easier to maintain the jobs all experimental
jobs (those which are not run in check and gate pipelines)
are moved to a separate file. They will be revised later
to use the same deploy-env role.

Also many charts use Openstack images for testing this
PR adds 2023.1 Ubuntu Focal overrides for all these charts.

Change-Id: I4a6fb998c7eb1026b3c05ddd69f62531137b6e51
2023-09-22 15:02:07 -05:00
..
files Uplift nginx ingress controller to v1.5.1 2022-12-14 15:19:51 -05:00
templates Prevent liveness probe from killing mariadb pods during SST 2023-09-20 14:12:24 -06:00
values_overrides Use deploy-env role for all deployment jobs 2023-09-22 15:02:07 -05:00
.helmignore MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
Chart.yaml Use deploy-env role for all deployment jobs 2023-09-22 15:02:07 -05:00
README.rst MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
requirements.yaml Update htk requirements 2021-10-06 01:02:28 +00:00
values.yaml Update kubernetes registry to registry.k8s.io 2023-04-11 04:54:26 +03:00

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 When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints.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