Skip to content

Kubeadm.md

Latest commit

 

History

History
144 lines (87 loc) · 4.52 KB

Kubeadm.md

File metadata and controls

144 lines (87 loc) · 4.52 KB

Kubeadm Installation Guide

This guide outlines the steps needed to set up a Kubernetes cluster using kubeadm.

Pre-requisites

  • Ubuntu OS (Xenial or later)
  • sudo privileges
  • Internet access
  • t2.medium instance type or higher

Both Master & Worker Node

Run the following commands on both the master and worker nodes to prepare them for kubeadm.

# using 'sudo su' is not a good practice.
sudo apt update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo apt install docker.io -y

sudo systemctl enable --now docker # enable and start in single command.

# Adding GPG keys.
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

# Add the repository to the sourcelist.
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt update 
sudo apt install -y kubeadm=1.28.1-1.1 kubelet=1.28.1-1.1 kubectl=1.28.1-1.1 -y

Sample Command run on master node

image

image

image

Master Node

  1. Initialize the Kubernetes master node.

    sudo kubeadm init

    image

    After succesfully running, your Kubernetes control plane will be initialized successfully.

    image

  2. Set up local kubeconfig (both for root user and normal user):

    mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

    image

  3. Apply Weave network:

    kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml

    image

  4. Generate a token for worker nodes to join:

    sudo kubeadm token create --print-join-command

    image

  5. Expose port 6443 in the Security group for the Worker to connect to Master Node

image

Worker Node

  1. Run the following commands on the worker node.

    sudo kubeadm reset pre-flight checks

    image

  2. Paste the join command you got from the master node and append --v=5 at the end. Make sure either you are working as sudo user or use sudo before the command

    image

    After succesful join-> image

Verify Cluster Connection

On Master Node:

kubectl get nodes

image

Optional: Labeling Nodes

If you want to label worker nodes, you can use the following command:

kubectl label node <node-name> node-role.kubernetes.io/worker=worker

Optional: Test a demo Pod

If you want to test a demo pod, you can use the following command:

kubectl run hello-world-pod --image=busybox --restart=Never --command -- sh -c "echo 'Hello, World' && sleep 3600"

image