openstack/openstack-helm-infra
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10fca14997
openstack-helm-infra/mariadb
History
Vasyl Saienko 954e338d17 [mariadb] Add mariadb controller support 
This patch adds mairadb controller that is responsible to mark one
ready pod as mariadb_role: primary to forward all traffic to it.
This will allow to drop nginx ingress controller which adds extra
hops between client and server and uses heavy customized nginx templates.

Change-Id: I3b29bc2029bfd39754516e73a09e4e14c52ccc99
2024-09-14 18:07:38 +00:00
..
files Ingress-nginx controller upgrade for mariadb 2024-08-27 15:36:23 +00:00
templates [mariadb] Add mariadb controller support 2024-09-14 18:07:38 +00:00
values_overrides Add 2024.1 overrides to some charts 2024-07-23 07:35:50 -05:00
.helmignore MariaDB: Move chart to openstack-helm-infra 2018-09-04 18:57:53 -05:00
Chart.yaml [mariadb] Add mariadb controller support 2024-09-14 18:07:38 +00:00
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 [mariadb] Add mariadb controller support 2024-09-14 18:07:38 +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 When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints.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