0ca1a7942e
This is a major refactor of the mariadb chart. A few things
are accomplished:
* The chart template layout is updated to match our keystone
chart, providing a more structure to the chart.
* The chart was updated to leverage StatefulSets, which requires
Kubernetes 1.5, and helm 2.1.0.
* The bootstrapping process was completely overhauled to support
the unique constraints of statefulsets, namely that they come up
one by one, needing the previous to be in a ready state before
the next is provisioned.
* The references to {{ .IP }} we removed and replaced with POD_IP
environmental passing and address binding was fixed in several
places for wsrep functionality. This may explain several oddities
with the previous setup causing mysterious and intermittent
database consistency issues.
1.6 KiB
aic-helm/mariadb
By default, this chart creates a 3-member mariadb galera cluster.
This charge 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 When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints.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