Skip to content

Latest commit

 

History

History
14 lines (10 loc) · 1.38 KB

HA.md

File metadata and controls

14 lines (10 loc) · 1.38 KB

High availability

This operator supports the following High Availability modes:

  • Single master HA via SemiSync Replication: The primary node allows both reads and writes, while secondary nodes only allow reads.
  • Multi master HA via Galera: All nodes support reads and writes, but it is recommended to perform writes in a single primary for preventing deadlocks.

In order to address nodes, mariadb-operator provides you with the following Kubernetes Services:

  • <mariadb-name>: To be used for read requests. It will point to all nodes.
  • <mariadb-name>-primary: To be used for write requests. It will point to a single node, the primary.
  • <mariadb-name>-secondary: To be used for read requests. It will point to all nodes, except the primary.

Whenever the primary changes, either by the user or by the operator, both the <mariadb-name>-primary and <mariadb-name>-secondary Services will be automatically updated by the operator to address the right nodes.

The primary may be manually changed by the user at any point by updating the spec.[replication|galera].primary.podIndex field. Alternatively, automatic primary failover can be enabled by setting spec.[replication|galera].primary.automaticFailover, which will make the operator to switch primary whenever the primary Pod goes down.