Overview:-

In this Blog, we will create a Kubernetes Cluster.

Creating Master and Worker nodes:-

At first, we will need 2 nodes(Master and Worker nodes) and connect both with our system.
I will use AWS EC2 to create Master and Worker nodes and connect them with our system using SSH.
Sign into your AWS Console and Search for EC2.
Click on EC2 and Click on Launch Instance which is in the Orange box.
Name it I will name it Kubernetes-Master-Node and from the Application and OS Images(Amazon Machine Image) select Ubuntu.
Coming down from the Instance type select t2.medium as Kubernetes Cluster requires some more Inputs.
Now in the Key pair(login) choose any Key. I have already one I will select it.
Now in the Network settings choose all three SSH, HTTPs and HTTP traffic.
From the right side write 2 in the Number of instances as we need Master and Worker nodes and then click on Launch instance.
Now our 2 instances will be launched with the same name so we have to rename one instance as Kubernetes-Worker-Node.
We will Connect both the Servers with our system using SSH. So open two different terminals in your system.
I will show one server process the same for the other one.
Check any one Instance and click on Connect from the top right side.
After clicking on Connect we will see a box like this:

Now in the SSH client section copy the line in the Example.
Open your terminal and navigate to the path where your key pair is present. In most cases, it's in the Downloads.

Run the Command:

cd Downloads/

After Navigating to Downloads paste your Example line with sudo at the beginning. It should look like this:
This will connect your Server with the System Using SSH.
Do the same for another server.

Set up Kubernetes cluster using Kubeadm:-

We have both the Master and Worker nodes connected to our system using SSH.

Run these commands together in both the nodes:

  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 

  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
  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

We have to run these commands in both the nodes Master and Worker.

Initializing Kubernetes Master node(Master Server):-

Now coming in the Master node we will set some things.
At first, run the command:
```
  sudo kubeadm init
```

Then to set local KubeConfig run the commands:

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

To install CNI run the command:

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

We will generate a token for our worker node to get connected with the master node for this run the command:
```
  sudo kubeadm token create --print-join-command
```
This command will give us a token for connection.

Make sure to Expose PORT 6443 in the Security group in the Master node.

Connecting Worker Node with Master node:-

Now we have to connect the Worker node with the master node.
Af first runs this command in the Worker node:

sudo kubeadm reset pre-flight checks

Now the token that we got before pasted it with --v=5 at the end. This will connect both the nodes and our Kubernetes Cluster will be completed.
For verification in the Master node run the command:
```
  kubectl get nodes
```

Creating a Kubernetes Cluster

Table of contents

Overview:-

Creating Master and Worker nodes:-

Set up Kubernetes cluster using Kubeadm:-

Initializing Kubernetes Master node(Master Server):-

Connecting Worker Node with Master node:-

Thanks.