My start to a local kubernetes cluster: microK8s @ubuntu

After playing around with zigbee on raspberry pi, i decided to build up my own kubernetes cluster at home. I have to raspberry pi running ubuntu server, so i wanted to go this direction:

The start is very easy. Just follow the steps shown here:

https://microk8s.io/docs

But by adding the second node i got the following result:

root@zigbee:/home/ubuntu/kubernetes# microk8s kubectl get nodes
NAME     STATUS     ROLES    AGE   VERSION
ubuntu   NotReady   <none>   98s   v1.19.3-34+b9e8e732a07cb6
zigbee   NotReady   <none>   37m   v1.19.3-34+b9e8e732a07cb6

Hmmm.

The best way to debug this problem is

# microk8s inspect
Inspecting Certificates
Inspecting services
  Service snap.microk8s.daemon-cluster-agent is running
  Service snap.microk8s.daemon-containerd is running
  Service snap.microk8s.daemon-apiserver is running
  Service snap.microk8s.daemon-apiserver-kicker is running
  Service snap.microk8s.daemon-control-plane-kicker is running
  Service snap.microk8s.daemon-proxy is running
  Service snap.microk8s.daemon-kubelet is running
  Service snap.microk8s.daemon-scheduler is running
  Service snap.microk8s.daemon-controller-manager is running
  Copy service arguments to the final report tarball
Inspecting AppArmor configuration
Gathering system information
  Copy processes list to the final report tarball
  Copy snap list to the final report tarball
  Copy VM name (or none) to the final report tarball
  Copy disk usage information to the final report tarball
  Copy memory usage information to the final report tarball
  Copy server uptime to the final report tarball
  Copy current linux distribution to the final report tarball
  Copy openSSL information to the final report tarball
  Copy network configuration to the final report tarball
Inspecting kubernetes cluster
  Inspect kubernetes cluster
Inspecting juju
  Inspect Juju
Inspecting kubeflow
  Inspect Kubeflow

# Warning: iptables-legacy tables present, use iptables-legacy to see them
WARNING:  Docker is installed. 
File "/etc/docker/daemon.json" does not exist. 
You should create it and add the following lines: 
{
    "insecure-registries" : ["localhost:32000"] 
}
and then restart docker with: sudo systemctl restart docker
WARNING:  The memory cgroup is not enabled. 
The cluster may not be functioning properly. Please ensure cgroups are enabled 
See for example: https://microk8s.io/docs/install-alternatives#heading--arm 
Building the report tarball
  Report tarball is at /var/snap/microk8s/1794/inspection-report-20201212_194335.tar.gz

And as you can see: this contains the solution!

After adding the /etc/docker/daemon.json everything went fine:

root@zigbee:~# kubectl get nodes 
NAME     STATUS   ROLES    AGE    VERSION
ubuntu   Ready    <none>   46h    v1.19.3-34+b9e8e732a07cb6
zigbee   Ready    <none>   2d3h   v1.19.3-34+b9e8e732a07cb6