PostgreSQL Juju Charm for k8s

Description

Charm for Juju to deploy and manage PostgreSQL in a Kubernetes environment. Multiple units will provision a single master and remaining units as hot standby servers. Automatic failover will occur if a database goes down and there are enough remaining units for form a quorum, managed by repmgrd.

Usage

Provision a Juju environment and a k8s model, per Juju documentation. Then to deploy 3 units (pods) using the default image, simply:

juju deploy -n3 cs:~postgresql-charmers/postgresql-k8s postgresql

Client charms needing to connect with PostgreSQL should use the ops-lib-pgsql library to manage the relation.

Scale Out Usage

To horizontally scale, adding more read-only standbys:

juju add-unit postgresql

Note that this charm provides standard PostgreSQL, with a single read/write master node. Adding more nodes can only provide extra read-only capacity, and only to clients making use of the hot standby connection details (which will be load balanced over all available hot standby databases).

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Testing

Just run make test.