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Basic Overview of --> rhel_master.yaml

For K8s Master Node Configuration:

  1. Get the Master Node Private IP: Sets the MASTER_PRIVATE_IP variable having the private IP address of the master node using shell commands.

  2. Define the POD_CIDR Variable: Sets the POD_CIDR variable to 192.168.0.0/16 in the shell.

  3. Define the Master Node Name: Sets the NODENAME variable to the short hostname of the master node using shell commands.

  4. Initialize the Kubernetes Cluster: Initializes the Kubernetes cluster on the master node using kubeadm init command with various options such as --apiserver-advertise-address, --apiserver-cert-extra-sans, --pod-network-cidr, --node-name, and --ignore-preflight-errors Swap.

  5. Output of the Kubeadm Init Command: Prints the output of the kubeadm init command for debugging purposes.

  6. Create .kube Directory: Ensures the .kube directory exists in the user's home directory.

  7. Copy Admin.conf to User's .kube Directory: Copies the admin.conf file from /etc/kubernetes to the user's .kube/config directory.

  8. Change Ownership of .kube/config: Changes the ownership of the config file to the user.

  9. Configure the CNI using Calico: Applies the Calico CNI (Container Network Interface) configuration using kubectl apply command.

  10. Generate Join Command: Generates the join command for worker nodes to join the cluster using kubeadm token create --print-join-command.

  11. Copy Join Command to Local File: Copies the join command to a local file named join-command.

For Worker Node Configuration:

  1. Copy Join Command to Server Location: Copies the join command file from the local machine to the /tmp directory on the worker node.

  2. Join the Node to Cluster: Executes the join command script to join the worker node to the Kubernetes cluster.