Interfaces/endpoints
MySQL Router K8s supports modern ‘mysql_client’ interface. Applications can easily connect MySQL using ‘data_interfaces’ library from ‘data-platform-libs’.
Modern mysql_client interface (database endpoint):
Adding a relation is accomplished with juju relate (or juju integrate for Juju 3.x) via endpoint database. Read more about Juju relations (integrations). Example:
# Deploy Charmed MySQL K8s and MySQL Router K8s clusters with 3 nodes each
juju deploy mysql-k8s -n 3 --trust
juju deploy mysql-router-k8s -n 3 --trust --channel 8.0
# Deploy the relevant charms, e.g. mysql-test-app
juju deploy mysql-test-app
# Relate all applications
juju integrate mysql-k8s mysql-router-k8s
juju integrate mysql-router-k8s:database mysql-test-app
# Check established relation (using mysql_client interface):
juju status --relations
# Example of the properly established relation:
# > Integration provider Requirer Interface Type Message
# > mysql-k8s:database mysql-router-k8s:backend-database mysql_client regular
# > mysql-router-k8s:database mysql-test-app:database mysql_client regular
# > ...
Note: In order to relate with Charmed MySQL K8s, every table created by the client application must have a primary key. This is required by the group replication plugin enabled in this charm.
See all the charm interfaces here.