Running the Script

To execute the script, follow these steps:

1. Grant execute permissions to the script:

   chmod +x kubeadm.sh

2. Run the script:

   ./kubeadm.sh

After running the script, repeat this steps for each control plane and worker nodes to ensure proper configuration.

Control Plane Node Setup

After running the script in the control plane node, initialize Kubernetes:

kubeadm init

Configure kubectl Access

To start using your cluster, run the commands below:

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

If you are a root user, you can run the following command:

export KUBECONFIG=/etc/kubernetes/admin.conf

Apply CNI YAML

To set up the container network interface (CNI), apply the following YAML:

kubectl apply -f https://reweave.azurewebsites.net/k8s/v1.30/net.yaml

Join Worker Nodes

To join worker nodes to the cluster, run the kubeadm join command displayed on the control plane node after initialization. The command will look similar to the following:

kubeadm join <control-plane-host>:<port> --token <token> --discovery-token-ca-cert-hash sha256:<hash>

Run this command for each worker nodes.

Ensure you copy and run the exact command shown in your terminal output during the kubeadm init process.