openstack/openstack-helm
Code Issues Proposed changes
bc44906d55
openstack-helm/mariadb
History
Steve Wilkerson b42cd19bdc Add prometheus exporters to osh charts 
This moves the prometheus exporters for services into a directory
in the chart themselves. This keeps the monitoring services
coupled to the services theyre meant to monitor. This changes the
chart directory structure to include a monitoring/ directory to
host any monitoring requirements (not just prometheus exporters)

Change-Id: Ic5f46a7e9a2a773a837ff399b8730782cf89f1de
2018-02-07 15:55:49 -06:00
..
templates Add prometheus exporters to osh charts 2018-02-07 15:55:49 -06:00
.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 Add prometheus exporters to osh charts 2018-02-07 15:55:49 -06:00

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 When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints.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