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Objective
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Create a scalable and highly available containerized web application deployment using Terraform, Ansible, and a self-managed Kubernetes cluster on AWS. This exercise tests your ability to:
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Provision infrastructure as code using Terraform.
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Automate configuration management with Ansible.
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Set up and manage a Kubernetes cluster on virtual machines.
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Deploy applications using Kubernetes.
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Apply security best practices with appropriate IAM policies.
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Task Overview
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1. Infrastructure Provisioning with Terraform
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Use Terraform to provision the following AWS resources:
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VPC and Networking:
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A VPC with public and private subnets spread across two availability zones.
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An Internet Gateway and appropriate Route Tables for public subnets.
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NAT Gateways for private subnet internet access.
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Compute Resources:
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Three EC2 instances:
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One master node for Kubernetes control plane.
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Two worker nodes for running containerized applications.
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Instances should be in private subnets for security.
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Security Groups and IAM Roles:
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Security groups to control access:
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Allow SSH access from your IP to the master node.
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Allow Kubernetes communication between nodes.
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IAM roles and policies for EC2 instances as needed.
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2. Configuration Management with Ansible
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Use Ansible to perform the following:
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Set Up Kubernetes Cluster:
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Install necessary dependencies (Docker, kubeadm, kubelet, kubectl) on all nodes.
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Initialize the Kubernetes control plane on the master node using kubeadm.
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Join the worker nodes to the cluster.
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Deploy a Sample Application:
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Use Ansible to deploy a containerized web application (e.g., NGINX or a custom Docker image) to the Kubernetes cluster.
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Expose the application via a Kubernetes Service of type NodePort or LoadBalancer (using an external load balancer if preferred).
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3. Testing and Validation
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Access the application's endpoint to verify it is running correctly.
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Scale the deployment to multiple replicas and observe the changes.