This page shows you how to properly decommission a cluster.
This page assumes you have a working Juju deployed cluster.
Warning: By the time you’ve reached this step you should have backed up your workloads and pertinent data; this section is for the complete destruction of a cluster.
It is recommended to deploy individual Kubernetes clusters in their own models, so that there is a clean separation between environments. To remove a cluster first find out which model it’s in with
juju list-models. The controller reserves an
admin model for itself. If you have chosen to not name your model it might show up as
$ juju list-models Controller: aws-us-east-2 Model Cloud/Region Status Machines Cores Access Last connection controller aws/us-east-2 available 1 2 admin just now my-kubernetes-cluster* aws/us-east-2 available 12 22 admin 2 minutes ago
You can then destroy the model, which will in turn destroy the cluster inside of it:
juju destroy-model my-kubernetes-cluster
$ juju destroy-model my-kubernetes-cluster WARNING! This command will destroy the "my-kubernetes-cluster" model. This includes all machines, applications, data and other resources. Continue [y/N]? y Destroying model Waiting on model to be removed, 12 machine(s), 10 application(s)... Waiting on model to be removed, 12 machine(s), 9 application(s)... Waiting on model to be removed, 12 machine(s), 8 application(s)... Waiting on model to be removed, 12 machine(s), 7 application(s)... Waiting on model to be removed, 12 machine(s)... Waiting on model to be removed... $
This will destroy and decommission all nodes. You can confirm all nodes are destroyed by running
If you’re using a public cloud this will terminate the instances. If you’re on bare metal using MAAS this will release the nodes, optionally wipe the disk, power off the machines, and return them to available pool of machines to deploy from.
If you’re not using the controller for anything else, you will also need to remove the controller instance:
$ juju list-controllers Use --refresh flag with this command to see the latest information. Controller Model User Access Cloud/Region Models Machines HA Version aws-us-east-2* - admin superuser aws/us-east-2 2 1 none 2.0.1 $ juju destroy-controller aws-us-east-2 WARNING! This command will destroy the "aws-us-east-2" controller. This includes all machines, applications, data and other resources. Continue? (y/N):y Destroying controller Waiting for hosted model resources to be reclaimed All hosted models reclaimed, cleaning up controller machines $