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Ansible-Driven Kubernetes Provisioning with Terraform Workflow

This approach leverages Ansible to provision and manage a Kubernetes (K8s) cluster while adopting Terraform's structured workflow—init, plan, apply—to maintain consistency, modularity, and automation. The entire configuration and deployment process is controlled through a variable file (vars.yaml), ensuring flexibility and reproducibility.

Key Workflow Phases

1.Init (ansible-playbook init.yaml)

  • Prepares the environment by installing dependencies (e.g., kubectl, kubeadm, docker/containerd, CNI plugins).
  • Validates infrastructure prerequisites such as SSH access, network configuration, and storage availability.

2.Plan (ansible-playbook plan.yaml)

  • Reads the vars.yaml file to generate a preview of the intended infrastructure state.
  • Simulates resource creation, ensuring that configurations are correctly defined before actual deployment.
  • Highlights any misconfigurations, missing dependencies, or conflicts.

3.Apply (ansible-playbook apply.yaml)

  • Executes the provisioning of the K8s cluster based on the validated plan.
  • Deploys master and worker nodes, initializes kubeadm, and applies networking (e.g., Calico, Flannel).
  • Configures authentication, RBAC, and installs essential add-ons like kube-proxy and CoreDNS.
  • Registers nodes with the cluster and performs health checks.

4.Destroy (ansible-playbook destroy.yaml) (Optional, for teardown)

  • Cleans up the cluster by gracefully draining and deleting nodes.
  • Uninstalls Kubernetes and removes configurations from servers.