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Phase 9 — Ansible Automation

Automate node configuration, cluster setup, and app deployment with Ansible.

Why Ansible?​

✔ Idempotent — run multiple times safely
✔ Agentless — uses SSH
✔ YAML playbooks — readable and version-controlled
✔ Can rebuild entire cluster from scratch

Install Ansible​

sudo apt install ansible

Inventory File​

# inventory.ini
[control_plane]
set-hog ansible_host=10.0.0.2 ansible_user=ubuntu

[workers]
fast-skunk ansible_host=10.0.0.4 ansible_user=ubuntu
fast-heron ansible_host=10.0.0.7 ansible_user=ubuntu

[cluster:children]
control_plane
workers

Use Cases​

k3s cluster install​

- name: Install k3s control plane
  hosts: control_plane
  tasks:
    - name: Run k3s installer
      shell: curl -sfL https://get.k3s.io | sh -

Node configuration​

- name: Configure all nodes
  hosts: cluster
  tasks:
    - name: Install base packages
      apt:
        name: [curl, vim, htop, net-tools]
        state: present

Cluster rebuild​

✔ Tear down cluster
✔ Re-provision via MAAS
✔ Re-install k3s via Ansible
✔ Re-deploy apps via ArgoCD

Done When​

✔ Full cluster deployable from a single ansible-playbook command
✔ Node configs reproducible