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Juju is an open source application orchestration engine that enables any application operation (deployment, integration, lifecycle management) on any infrastructure (Kubernetes or otherwise) at any scale (development or production) in the same easy way (typically, one line of code), through special operators called ‘charms’.

Let's use Juju to deploy, configure, and integrate some Kubernetes charms:

You will need a cloud and Juju. The quickest way is to use a Multipass VM launched with thecharm-dev blueprint.

Install Multipass. On Linux:

sudo snap install multipass

Use Multipass to launch an Ubuntu VM with thecharm-dev blueprint:

multipass launch --cpus 4 --memory 8G --disk 50G --name tutorial-vm charm-dev

Open a shell into the VM:

multipass shell tutorial-vm

Verify that you have Juju and two localhost clouds:

juju clouds

Bootstrap a Juju controller into the MicroK8s cloud:

juju bootstrap microk8s tutorial-controller

Add a workspace, or 'model':

juju add-model tutorial-model

Deploy Mattermost:

juju deploy mattermost-k8s

See more:Charmhub |mattermost-k8s

Deploy PostgreSQL:

juju deploy postgresql-k8s --channel 14/stable --trust

See more:Charmhub |postgresql-k8s

Enable security in your PostgreSQL deployment:

juju deploy tls-certificates-operatorjuju config tls-certificates-operator generate-self-signed-certificates="true" ca-common-name="Test CA"juju integrate postgresql-k8s tls-certificates-operator

Integrate Mattermost with PostgreSQL:

juju integrate mattermost-k8s postgresql-k8s:db

Watch your deployment come to life:

watch -n 1 -c juju status --color

Use the--relations flag to view more information about your integrations.Use the--storage flag to view more information about your storages.

When everything is inactive oridle status, note the IP address and port of Mattermost and pass them tocurl:

curl <IP address>:<port>/api/v4/system/ping

You should see the output below:

{"AndroidLatestVersion":"","AndroidMinVersion":"","IosLatestVersion":"","IosMinVersion":"","status":"OK"}

You now have a Kubernetes deployment consisting of a Mattermost backed by PosgreSQL with TLS-encrypted traffic!

Delete your Multipass VM:

multipass delete --purge tutorial-vm

Uninstall Multipass. On Linux:

snap remove multipass

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