Juju Bootstrap Party - Bring-your-own-Kubernetes!

Kubernetes is a wonderfully diverse topic, and nothing is more diverse than the specifics of each cluster. Whether you’re consuming vanilla Elastic Kubernetes Service, rolling Minikube in production like a lunatic, or hand-crafting a very special Kubernetes-the-hard-way style cluster, they all have their nuances (and that’s before we consider complex networking setups, firewalls, outbound proxies and the like).

In recent release candidates of Juju 2.9 (rc7/rc8/rc9), we’ve done a lot of work to ensure the juju bootstrap process on Kubernetes is as smooth and as universal as possible - meaning it should be easier than ever to bootstrap a Juju controller on a very vanilla Kubernetes, or a Super Special Kubernetes™!

We’d appreciate your eyes on this improved process before we release 2.9 into the stable channel. We’d especially appreciate a test on those clusters that are a little divergent from the norm, are deployed in strange places or have evolved over time.

Get Bootstrapped

To get started, you just need:

  • The latest version of Juju from the candidate channel
  • Access to an existing Kubernetes cluster (any will do!)
  • A few minutes!

Get started by installing or updating Juju:

# If you're installing from scratch
$ sudo snap install juju --classic --channel=2.9/candidate

# If you're updating an existing Juju install
$ sudo snap refresh juju --channel=2.9/candidate

Now, confirm you have access to a Kubernetes cluster, and bootstrap it! Your KUBECONFIG will be picked up automatically by the bootstrap process, provided you use the same name in the bootstrap command as the name of the kubectl context!

# Check we've got access to a cluster context
$ kubectl config get-contexts
CURRENT   NAME                       CLUSTER              AUTHINFO                              NAMESPACE
          microk8s                   microk8s-cluster     admin                                 
*         super-cool-cluster-admin   super-cool-cluster   clusterAdmin_juju-test_juju-cluster   

# Bootstrap the controller on the cluster
$ juju bootstrap super-cool-cluster-admin

Get Charming

When that command returns successfully, you’ll be ready to deploy a range of awesome charms (and charm bundles). Take your pick from Charmhub, or check out some our favourites:

Mattermost

Mattermost is a flexible, open source messaging platform that enables secure team collaboration. Check it out on Charmhub, or if you can’t wait:

# Create a Juju model
$ juju add-model mattermost
# First, deploy PostgresSQL on Kubernetes
$ juju deploy cs:~postgresql-charmers/postgresql-k8s postgresql
# Now deploy Mattermost
$ juju deploy cs:~mattermost-charmers/mattermost --config juju-external-hostname=mattermost.test
# Seamlessly integrate Mattermost and PostgreSQL 🚀
$ juju add-relation mattermost postgresql:db
# Expose the service so you can hit it in your browser
$ juju expose mattermost
# Confirm the deployment was successful:
$ juju status
Model       Controller  Cloud/Region        Version  SLA          Timestamp
mattermost  micro       microk8s/localhost  2.9-rc9  unsupported  13:31:09+01:00

App         Version            Status  Scale  Charm           Store       Channel  Rev  OS          Address        Message
mattermost  mattermost:5.32.1  active      1  mattermost      charmstore  stable    20  kubernetes  10.152.183.54  
postgresql  pgcharm:edge       active      1  postgresql-k8s  charmstore  stable    10  kubernetes                 

Unit           Workload  Agent  Address       Ports     Message
mattermost/0*  active    idle   10.1.215.212  8065/TCP  
postgresql/0*  active    idle   10.1.215.211  5432/TCP  Pod configured

Using the example above, you should now be able to get Mattermost on http://10.152.183.54:8065. Your mileage may vary depending on your individual cluster networking setup!

Charmed Kubeflow

If you’re feeling more adventurous, Charmed Kubeflow wraps the 30+ apps that make up Kubeflow with rock-solid ops code. Charmed Kubeflow integrates these charms to provide the best Kubeflow experience, from deployment to day-2 operations.

Extra goodies for Charming Ninjas

We’re also building the foundations of a better future for Juju + Kubernetes. Check out the Future of Charmed Operators on Kubernetes post for more details and try your hand at building a fancy new charm that implements the sidecar pattern!

Thank you!

We really appreciate any time you can dedicate to testing this out, we look forward to hearing your feedback and making Juju even more awesome! You can post feedback any way that suits you:

5 Likes

Not a very special cluster, but works fine for me on Azure Kubernetes Service :slight_smile:

1 Like

Anybody got a particularly gnarly kubespray kluster to test?