Simplified Guide: Setting Up Kubernetes with Kubeadm

Introduction

Hey there! We're about to explore Kubernetes, a powerful tool for managing applications. We'll be using Kubeadm, a beginner-friendly helper tool that makes setting up a Kubernetes cluster a breeze. It takes care of the tricky stuff, so you can focus on learning. Ready to dive in and get your cluster up and running? Let's go! 🚀

What is Kubeadm?

Kubeadm is a user-friendly tool designed to simplify the process of setting up a Kubernetes cluster. It automates many of the manual tasks, making it accessible for beginners. With Kubeadm, you can easily initialize a cluster, join nodes, and manage configurations.

Prerequisites:

Before using Kubeadm to set up a Kubernetes cluster, ensure you have the following prerequisites:

One or more machines: Running a deb/rpm-compatible Linux OS, such as Ubuntu or CentOS.
Memory: Minimum of 2GB RAM for smooth operation.
CPUs: At least 2 CPUs are required.
Internet: Strong internet connection for communication.

Step-by-Step Guide: Setting Up Kubernetes with Kubeadm (Ubuntu)

Creating an Ec2 Instances

Sign in to AWS Console
Navigate to EC2
Launch an Instance
Select an Instance Type: Control-plane node: 2 CPUs, 4 GiB RAM (t2.medium). Worker node: t2.micro***.***
Configure Instance Details

Here's how our instances look in the end.

Need more help setting up? Check out this easy-to-follow video tutorial 👇

https://www.youtube.com/watch?v=gz3dr6o5gxI

Initiating the Kubernetes Cluster

Commands for Both Master and Worker Node:

sudo apt update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo apt install docker.io -y

Enable and start in single command.

sudo systemctl enable --now docker

Adding GPG (GNU Privacy Guard) keys

curl -fsSL "https://packages.cloud.google.com/apt/doc/apt-key.gpg" | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/kubernetes-archive-keyring.gpg

Add the repository to the sourcelist.

echo 'deb https://packages.cloud.google.com/apt kubernetes-xenial main' | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt update 
sudo apt install kubeadm=1.20.0-00 kubectl=1.20.0-00 kubelet=1.20.0-00 -y

Commands for Master Node Only:

Initialize the Kubernetes master node.

sudo kubeadm init

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

Apply Weave network:

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

Generate a token for worker nodes to join:

sudo kubeadm token create --print-join-command

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

Commands for Worker Node Only:

Run the following commands on the worker node.

sudo kubeadm reset pre-flight checks

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
After succesful join->

Verify Cluster Connection

On Master Node:

kubectl get nodes

Congratulations! 🎉 You've achieved it! Your efforts have paid off, and now you have a fully functional K8s cluster up and running, all thanks to your work with Kubeadm.

Let's Connect ❤️:

|￣￣￣￣￣￣￣￣￣￣￣￣￣|
------- Let's connect! -------
|＿＿＿＿＿＿＿＿＿＿＿＿＿|
............... \ (•◡•) / ...................
................. \ ...... / .....................
.................. ——- .......................
.................. | ... | ......................
.................. |_ . |_ ....................

Thank you for exploring my blog!