SOPs/Kubernetes Installation at main · akramdevopstrainer/SOPs · GitHub

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**Kubernetes Installation SOP**

This SOP outlines the steps to install Kubernetes on a cluster. The following commands should be executed on the respective nodes:
master and worker.

**Prerequisites:**
- Use EC2 - t2 medium for master and t2 micro for workwe
- The nodes should be running a supported Linux distribution (e.g., Ubuntu).
- Ensure that the nodes have internet connectivity.
- Ports for the Control-plane (Master) Node(s)

1. TCP 6443      → For Kubernetes API server
2. TCP 2379–2380 → For etcd server client API
3. TCP 10250     → For Kubelet API
4. TCP 10259     → For kube-scheduler
5. TCP 10257     → For kube-controller-manager
6. TCP 22        → For remote access with ssh
7. UDP 8472      → Cluster-Wide Network Comm. — Flannel VXLAN
Ports for the Worker Node(s)

1. TCP 10250       → For Kubelet API
2. TCP 30000–32767 → NodePort Services†
3. TCP 22          → For remote access with ssh
4. UDP 8472        → Cluster-Wide Network Comm. — Flannel VXLAN

1. Open a terminal and log in as root using the command: `sudo su`.

you can chnage the hostname using below command

-> sudo hostnamectl set-hostname master

2. Update the package manager and install Docker by running the following commands:
```
apt-get update
apt-get install docker.io -y
service docker restart
```

3. Add the Kubernetes repository key by executing the command:
```
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
```

4. Create a Kubernetes repository file by running:
```
echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" >/etc/apt/sources.list.d/kubernetes.list
```

5. Update the package manager again to include the Kubernetes repository:
```
apt-get update
```

6. Install the required Kubernetes components (kubeadm, kubectl, kubelet) with a specific version (e.g., 1.20.0-00) by running the following command:
```
apt install kubeadm=1.20.0-00 kubectl=1.20.0-00 kubelet=1.20.0-00 -y
```

7. On the master node, initialize the cluster by executing:
```
kubeadm init
```

8. After running the `kubeadm init` command, a token will be generated. Copy the token command that starts with `kubeadm join` as it will be used to join worker nodes to the cluster.

9. On the master node, set up the kubeconfig file by executing the following commands:
```
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
```

10. Apply the Calico network plugin by running the command:
```
kubectl apply -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml
```

11. Deploy the NGINX Ingress Controller by executing the command:
```
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.49.0/deploy/static/provider/baremetal/deploy.yaml
```

12. To verify the installation and check the nodes in the cluster, use the command:
```
kubectl get nodes
```