kubernetes on Ubuntu 22.04
To create a Kubernetes cluster on Ubuntu 22.04, you can follow the steps outlined below:
Note: These instructions assume you have Ubuntu 22.04 installed on all nodes and have administrative access to them.
1. Update System Packages:
```
sudo apt update
sudo apt upgrade
```
2. Install Docker:
```
sudo apt install docker.io
```
3. Enable and Start Docker:
```
sudo systemctl enable docker
sudo systemctl start docker
```
4. Install Kubernetes Components:
```
sudo apt install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt update
sudo apt install -y kubelet kubeadm kubectl
```
5. Disable Swap:
```
sudo swapoff -a
sudo sed -i '/ swap / s/^/#/' /etc/fstab
```
6. Initialize the Cluster:
On the master node, run the following command to initialize the cluster:
```
sudo kubeadm init --pod-network-cidr=10.244.0.0/16
```
Make a note of the join command displayed after the initialization completes.
7. Set Up the Kubernetes Configuration:
```
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
```
8. Install a Pod Network Addon:
Choose a pod network add-on according to your preference. For example, you can use Flannel:
```
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
```
9. Join Worker Nodes:
On each worker node, run the join command you noted earlier:
```
sudo kubeadm join <master-node-ip>:<master-node-port> --token <token> --discovery-token-ca-cert-hash <hash>
```
Replace `<master-node-ip>`, `<master-node-port>`, `<token>`, and `<hash>` with the appropriate values from the master node initialization output.
10. Verify Cluster Status:
On the master node, run the following command to check the status of the cluster and the worker nodes:
```
kubectl get nodes
```
Congratulations! You have successfully created a Kubernetes cluster on Ubuntu 22.04.