Mysql Innodb Cluster
|20 Feb 2024
|28 Nov 2023
|09 Aug 2023
|05 May 2022
|28 Apr 2022
|27 Apr 2022
juju deploy mysql-innodb-cluster --channel 8.0/stable
Important: The eoan series is the first series supported by the mysql-innodb-cluster and mysql-router charms. These charms replace the percona-cluster charm starting with the focal series.
Important: This documentation supports version
3.x of the Juju client.
See the OpenStack Charm
guide if you are using the
config.yaml of the built charm (or see the charm in the Charm Store) for the full list of configuration options, along with their descriptions and default values. See the Juju documentation for details on configuring applications.
MySQL 8 is natively HA and requires at least three database units, which are often containerised. To deploy a three-node cluster to new containers on machines ‘0’, ‘1’, and ‘2’:
juju deploy -n 3 --to lxd:0,lxd:1,lxd:2 mysql-innodb-cluster
A cloud application is joined to the database via an instance of mysql-router. For a pre-existing keystone application:
juju deploy mysql-router keystone-mysql-router
juju integrate keystone-mysql-router:db-router mysql-innodb-cluster:db-router
juju integrate keystone-mysql-router:shared-db keystone:shared-db
Important: When network spaces are used, the mysql-router and mysql-innodb-cluster charms must be configured such that the ‘db-router’ endpoint is bound to the same space.
Passwords are automatically generated and stored by the application leader.
The root password required to use the
mysqlsh utilities locally on the units can be retrieved using the following command:
juju exec --unit mysql-innodb-cluster/leader leader-get mysql.passwd
TLS communication between MySQL InnoDB Cluster and its cloud clients is supported out of the box via a self-signed CA certificate bundled within MySQL itself. However, a better option is to use a certificate signed by a Vault-based CA. This can be done once Vault has been initialised and has a root CA:
juju integrate mysql-innodb-cluster:certificates vault:certificates
See the vault charm README for more information.
Adding a unit on a new subnet
When adding a unit to an already formed cluster, and where that unit resides on a subnet different from any existing unit, the following extra actions are needed:
juju run --wait mysql-innodb-cluster/leader update-unit-acls
juju run --wait mysql-innodb-cluster/leader add-instance address=<address of new unit>
This section lists Juju actions supported by the charm. Actions allow specific operations to be performed on a per-unit basis. To display action descriptions run
juju actions --schema mysql-innodb-cluster. If the charm is not deployed then see file
The OpenStack Charms project maintains two documentation guides:
- OpenStack Charm Guide: for project information, including development and support notes
- OpenStack Charms Deployment Guide: for charm usage information
Please report bugs on Launchpad.