I'll use Alpine Linux as it is a so light distribution.
My setup is:
192.168.1.100 master
192.168.1.101 node1
192.168.1.102 node2
Into master, let's install requirements, install the master node and get the token:
apk add curl
curl -sfL https://get.k3s.io | sh -
cat /var/lib/rancher/k3s/server/node-token
Into each one of the nodes:
apk add curl
k3s_token="<your_master_token_here>"
curl -sfL https://get.k3s.io | K3S_URL=https://master:6443 K3S_TOKEN=${k3s_token} sh -
Into the master again, check we see the nodes and config them as workers and disable the master node to run pods:
kubectl get nodes
kubectl label node node1 node-role.kubernetes.io/worker=worker
kubectl label node node2 node-role.kubernetes.io/worker=worker
kubectl taint --overwrite node master node-role.kubernetes.io/master=true:NoSchedule
It's done :)
If you want to run kubectl from another PC, install kubectl into your PC:
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
chmod +x kubectl
sudo mv kubectl /usr/local/sbin/
And then, copy the file /etc/rancher/k3s/k3s.yaml from your master into your ~/.kube/config PC.
You are ready! Test it from your PC:
costales@T410:~$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 46m v1.23.6+k3s1
node2 Ready worker 38m v1.23.6+k3s1
node1 Ready worker 38m v1.23.6+k3s1
costales@T410:~$
Not happy with k3s? Uninstall it with this command:
k3s-uninstall.sh