In a previous tutorial, I showed how to get started with microk8s on Ubuntu. Microk8s is a lightweight Kubernetes distribution; you can either run it locally or in production. In this tutorial, I will show you
- How to install microk8s on a Mac
- Develop and test a community add-on – in my case, I have added the Trivy Operator to microk8s
Special thanks for the help to
Backstory (you can skip this)
I have been using microk8s for some time until it stopped working on my Mac. For the longest time, I could not figure out what was wrong. Two months later, I really had to update the Trivy Operator addon, and finally managed to fix my local microk8s cluster. Others might have similar problems with their microk8s installation on Mac; for those, this blog post might be helpful.
In addition, the README in the community addons does not describe how to test an addon on Mac. Thus, I am detailing the process I followed in this blog post.
Microk8s has a very nice guide on spinning up a one node microk8s cluster on Mac. However, the guide did not work for me. Whenever I ran ‘microk8s install’ multipass, used for the VM to run the node(s), threw errors.
Short solution: Install multipass first, and separately before installing and running microk8s.
So here is what I did step by step:
- Install multipass:
brew install --cask multipass
- Make sure you can spin up a VM:
multipass launch --name demo
- And then test opening a shell in that VM:
multipass shell demo
- Exit the demo VM:
- Stop, delete and clean up the deleted VM:
multipass stop demo
multipass delete demo
multipass purge demo
Note: the purge command will only remove all deleted instances. The
listcommand will provide a nice overview of the differnet VM instance available.
- Install microk8s:
brew install ubuntu/microk8s/microk8s
- Create a microk8s cluster:
- View the VM:
- You can already access your cluster through `microk8s kubectl get nodes`; to use your cluster directly through kubectl, follow these steps:
First, go to your home directory:
If you don’t have a .kube folder, create one:
In the .kube directory move your microk8s kubeconfig:
microk8s config > config
Creating a new microk8s addon
You can view all the existing microk8s addons through:
To create your own addon, we must do multiple things:
- Write an addon
- Update the microk8s channel used to test our addon
- Add the addon to the addon folder inside of the microk8s-vm
Write an addon
The addons are in the microk8s-community-addons Git repository. You have to do four main things when writing your addon:
- Create an enable script that will install the tool
- Create a disable script that will remove
- Add the tool to the addons.yaml in the root of the folder
- Write a unit test
I followed the argo-cd addon to create the trivy-operator one. Thanks for Engin for the help on figuring that part out.
To test the addon, follow these steps:
- We need to update the channel (specific microk8s release) that we are using to have access to edit the addons. For this, first open a shell in the microk8s-vm:
multipass shell microk8s-vm
- Become sudo:
- Update the channel – you can see a list of channels and their specific use case here; to access, add and test add-ons, we need the edge channel:
snap refresh microk8s --channel 1.25/edge
- Open the addons folder:
- Make sure you see all the other addons here:
- Create a new directory for your addon:
- Create a disable script in that folder & copy the content of your enable script into that file:
- Create an enable script in that folder & copy the content of your enable script into that file:
- Make sure both scripts are executable:
chmod +x trivy/enable
chmod +x trivy/disable
- Modify the addons.yaml to use your scripts:
Lastly, we can try and use the addon.
exit the shell & then simply run:
microk8s enable <name of your addon>
In our case, this will be:
microk8s enable trivy
Make sure that your addon is installed properly; and then you can disable your addon:
microk8s disable <name of your addon>
microk8s disable trivy
What are your favourite CNCF projects? Does an addon for them already exist in the microk8s addons? If not, maybe you can create one.
Otherwise, have a look at the YouTube video & my YouTube channel for more tutorials related to Kubernetes and the cloud native ecosystem.
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