openstack/openstack-helm
Code Issues Proposed changes
35267bffe4
openstack-helm/mariadb
History
intlabs fe6107cf76 Images: Update values to allow simple parse of images being used 
This PS updates the values file layout for images to allow simple
parsing of the images in use by charts, allowing them to be queried
and modified much more simply. By moving the image tags to a 'tags'
key, we can extend the options used simply to accomodate extra
options simply (eg prefixing the tag for use with an internal
registry) or pre-pulling the images to reduce chart deploy failure.

Change-Id: I9ec1dbb00d997ab6cb021bf0b698f7aae740e95d
2017-10-23 10:05:20 -05:00
..
templates Images: Update values to allow simple parse of images being used 2017-10-23 10:05:20 -05:00
.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 Images: Update values to allow simple parse of images being used 2017-10-23 10:05:20 -05:00

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 When the job is no longer active, future StatefulSets provisioned will leverage the existing cluster members as gcomm endpoints.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