Kubernetes Overview:
- Open-source platform for container orchestration.
- Automates deployment, scaling, and management of containerized applications.
Key Features:
- Streamlines cluster orchestration, optimizing resource utilization.
- Enables seamless scaling and provides a portable solution for modern application deployment across diverse environments.

The combination of CentOS and Kubernetes provides a robust, scalable, and cost-efficient solution for container orchestration, making it an excellent choice for organizations seeking a versatile platform for managing containerized workloads.

PREREQUISITE

Set up CentOS 7 servers: 1 Master Node, 2 Worker Nodes.
Master Node should ideally have a minimum of 2 CPUs (not strictly required).
Ensure internet connectivity on all nodes for fetching Kubernetes and Docker packages.
Verify that the yum package manager is installed and can fetch packages remotely.
Access to an account with sudo or root privileges is necessary.

(Here I have taken one master and one worker node)

COMMON STEPS FOR MASTER and WORKER-NODE

Step 1: Launch EC2 Instances

Launch three EC2 instances(recommended)one for the master node and two for worker nodes. Choose a CentOS Amazon Machine Image (AMI) for instances.

Step 2: Configure Security Groups

Open all required Ports In AWS Security Groups. now we will open All traffic.

Step 3: Set Hostname on Nodes

Step 4: Disable SELinux

STEP5: Install Required Packages

Step 6: Manage and install Docker

Now Docker is installed, but the service is not yet running. Start and enable Docker using the commands

Step-7: Setup the Kubernetes Repo

Step 8-Install Kubernetes components

kubeadm: Facilitates Kubernetes cluster setup and initialization.
Kubelet: Node agent ensuring containers are running in a Pod.
kubectl: Command-line tool for interacting with the Kubernetes cluster.

→ Install kubeadm, Kubelet And Kubectl

yum install kubeadm-1.23.0-0 kubelet-1.23.0-0 kubectl-1.23.0-0 -y

Step 9-Create docker daemon config file

Step 10- Reload the Daemon , restart docker and restart Kubelet service

STEPS FOR MASTER-NODE

Step 11- Initialize Kubeadm

Set up local kubeconfig (both for regular user and root user):

need to run the following as a regular user

if you are the root user, run this

The process might take some minutes to complete. Once this command finishes, it displays a kubeadm join message.

NOTE: Save the output generated during the initialization of the Kubernetes master node, including the token and join command.This information is essential for connecting and adding worker nodes to the cluster during later stages of the deployment process.

On Worker node, Run the output command in your worker nodes