Note: All commands are written for juju >= v.3.0
If you are using an earlier version, check the Juju 3.0 Release Notes.
How to integrate with another application
Integrations (formerly “relations”) are connections between two applications with compatible endpoints. These connections simplify the creation and management of users, passwords, and other shared data.
This guide shows how to integrate Charmed PostgreSQL K8s with both charmed and non-charmed applications.
For developer information about how to integrate your own charmed application with PostgreSQL, see Development > How to integrate with your charm.
Summary
- Integrate with a charmed application
- Integrate with a non-charmed application
- Rotate application passwords
Integrate with a charmed application
Integrations with charmed applications are supported via the modern postgresql_client interface, and the legacy psql interface from the original version of the charm.
You can see which charms are compatible with PostgreSQL in the Integrations tab.
Modern postgresql_client interface
To integrate, run
juju integrate postgresql-k8s:database <charm>
To remove the integration, run
juju remove-relation postgresql-k8s <charm>
Legacy pgsql interface
Note that this interface is deprecated. See more information in Explanation > Legacy charm.
Using the mattermost-k8s charm as an example, an integration with the legacy interface could be created as follows:
juju integrate postgresql-k8s:db mattermost-k8s:db
Extended permissions can be requested using the db-admin endpoint:
juju integrate postgresql-k8s:db-admin mattermost-k8s:db
Integrate with a non-charmed application
To integrate with an application outside of Juju, you must use the data-integrator charm to create the required credentials and endpoints.
Deploy data-integrator:
juju deploy data-integrator --config database-name=<name>
Integrate with PostgreSQL K8s:
juju integrate data-integrator postgresql-k8s
Use the get-credentials action to retrieve credentials from data-integrator:
juju run data-integrator/leader get-credentials
Rotate application passwords
To rotate the passwords of users created for integrated applications, the integration should be removed and created again. This process will generate a new user and password for the application.
juju remove-relation <charm> postgresql-k8s
juju integrate <charm> postgresql-k8s
<charm>can bedata-integratorin the case of connecting with a non-charmed application.
Internal operator user
The operator user is used internally by the Charmed PostgreSQL K8s Operator. The set-password action can be used to rotate its password.
To set a specific password for the operator user, run
juju run postgresql-k8s/leader set-password password=<password>
To randomly generate a password for the operator user, run
juju run postgresql-k8s/leader set-password