Interfaces/endpoints
MySQL Router 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 and MySQL Router clusters
juju deploy mysql -n 3
juju deploy mysql-router -n 3 --channel dpe/edge
# Deploy the relevant charms, e.g. mysql-test-app
juju deploy mysql-test-app
# Relate all applications
juju integrate mysql mysql-router
juju integrate mysql-router: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:database mysql-router:backend-database mysql_client regular
# > mysql-router:database mysql-test-app:database mysql_client regular
# > ...
Note: In order to relate with Charmed MySQL, 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.