This project automates the deployment of a Kubernetes cluster using Terraform. The cluster includes a master node and worker nodes, configured using a combination of Terraform scripts and a bash script (init-master.sh) for setting up the master node.

Project Structure

• main.tf: Contains the Terraform configuration for provisioning the master and worker nodes.
• variables.tf: Defines the variables used in the Terraform configuration.
• outputs.tf: Outputs relevant information such as the master node IP and worker node IPs.
• init-master.sh: Bash script that configures the Kubernetes master node.

Usage

1. Initialize Terraform:

terraform init

2. Review and modify the variables (if needed):

Edit the variables.tf file to customize the configuration according to your environment, such as IP addresses and SSH credentials.

3. Apply the Terraform configuration:

Set up the Master Node:

To set up the Kubernetes master node:

terraform apply -target=module.master

This command will:

• Provision the master node.
• Run the init-master.sh script on the master node to configure Kubernetes.
• Set up the Flannel network plugin (or Calico as a fallback).

Set up the Worker Nodes:

Before applying the worker node configuration, you must update the terraform.tfvars file with the following values from the master node setup:

• kubeadm_token: The token generated during the master node initialization.
• ca_cert_hash: The certificate hash for secure communication between the master and worker nodes.

After updating terraform.tfvars, apply the configuration to set up the worker nodes:

terraform apply -target=module.worker

This command will:

• Provision the worker nodes.
• Automatically join them to the Kubernetes cluster.

5. Verify the Kubernetes cluster:

After applying the configurations, SSH into the master node and verify the setup:

ssh user@<master-node-ip>
export KUBECONFIG=/etc/kubernetes/admin.conf
kubectl get nodes
kubectl get pods --all-namespaces