Overview

Kubernetes is a container orchestration tool for managing containerized workloads and services. For creating a Kubernetes cluster, you should set up a container runtime and other configurations to initialize it. With MicroK8s, you can initialize a Kubernetes cluster in a simple way for learning Kubernetes.

Prerequisites

Two or more virtual machines for 1 master node and 1 or more worker node(s) with:

• Ubuntu 20.04 or newer

• 2 GB memory or more

• 20GB storage or more

• Internet access

Steps

1. Installing MicroK8s on the master node and worker node(s)

   On the master node and worker node(s)

    sudo snap install microk8s --classic
    sudo usermod -aG microk8s $USER
    sudo chown -fR $USER ~/.kube
    su - $USER
   

2. Joining worker node(s) to master node

   On master node

    microk8s add-node
    ---output omitted---
    Use the '--worker' flag to join a node as a worker not running the control
    plane, eg: microk8s join [master-node-ip]:25000/[some_value]/[some_value]--worker
    ---output omitted-
   

   On worker node(s)

    microk8s join [master-node-ip]:25000/[some_value]/[some_value] --worker
    ---output omitted---
    Currently, this worker node is configured with the following kubernetes API server endpoints:
    - [master-node-ip] and port 16443, this is the cluster node contacted during the join operation.
    ---output omitted---
   

3. Enable add-on

   On master node

    microk8s.enable dns dashboard metrics-server rbac
   

4. Setup kubectl

   On master node

    sudo apt install apt-transport-https --yes
    sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
    echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
    sudo apt update
    sudo apt install kubectl -y
    microk8s.config > ~/.kube/config
    echo 'source <(kubectl completion bash)' >>~/.bashrc
   

5. Labeling and tainting node(s)

    kubectl label [master-node-hostname] node-role.kubernetes.io/master=""
    kubectl label [worker-node-hostname1] node-role.kubernetes.io/worker=""
    kubectl taint [master-node-hostname1] node-role.kubernetes.io/master:NoSchedule
    kubectl label [worker-node-hostname(n)] node-role.kubernetes.io/worker=""
    kubectl taint [master-node-hostname(n)] node-role.kubernetes.io/master:NoSchedule