main.yml

---
- name: Set up cluster-wide configuration.
  hosts: cluster
  gather_facts: false
  become: true

  handlers:
    - name: reboot-pi
      reboot:

  vars_files:
    - config.yml

  tasks:
    - name: Ensure cgroups are configured correctly in cmdline.txt.
      ansible.builtin.replace:
        path: /boot/cmdline.txt
        regexp: '^([\w](?!.*\b{{ item }}\b).*)$'
        replace: '\1 {{ item }}'
      with_items:
        - "cgroup_memory=1"
        - "cgroup_enable=memory"
      notify: reboot-pi

    - name: Download K3s install script.
      ansible.builtin.get_url:
        url: https://get.k3s.io
        dest: "~/k3s_install.sh"
        mode: a+x


- name: Configure storage node (node 3).
  hosts: storage
  gather_facts: false
  become: true

  vars_files:
    - config.yml

  tasks:
    - name: Set up storage.
      include_tasks: tasks/storage.yml
      when: storage_configure


- name: Configure the control plane (node 1).
  hosts: control_plane
  gather_facts: false
  become: true

  vars_files:
    - config.yml

  tasks:
    - name: Install K3s on control plane (takes a while).
      ansible.builtin.shell: >-
        ~/k3s_install.sh >> ~/k3s_install_log.txt
      args:
        chdir: "~"
        creates: /var/lib/rancher/k3s/server/node-token

    - name: Get node token.
      ansible.builtin.command: cat /var/lib/rancher/k3s/server/node-token
      changed_when: false
      register: node_token_output

    - name: Set node_token fact.
      ansible.builtin.set_fact:
        node_token: "{{ node_token_output.stdout_lines[0] }}"

    - name: Ensure required dependencies are installed.
      package:
        name:
          - python3-pip
          - python3-setuptools
          - build-essential
          - golang
          - git
        state: present
      become: true

    - name: Ensure required Python libraries are installed.
      pip:
        name:
          - openshift
          - pyyaml
        state: present
      become: true


- name: Configure the nodes (nodes 2-4).
  hosts: nodes
  gather_facts: false
  become: true

  vars_files:
    - config.yml

  tasks:
    - name: Install K3s on nodes (takes a while).
      ansible.builtin.shell: >-
        K3S_URL=https://"{{ groups['control_plane'][0] }}":6443
        K3S_TOKEN="{{ hostvars[groups['control_plane'][0]]['node_token'] }}"
        ~/k3s_install.sh >> ~/k3s_install_log.txt
      args:
        chdir: "~"
        creates: /var/lib/rancher/k3s/agent/kubelet.kubeconfig

- name: Set up Helm.
  import_playbook: tasks/kubernetes/helm.yml
  tags: ['helm']

- name: Set up NFS PVCs.
  import_playbook: tasks/kubernetes/nfs.yml
  tags: ['nfs']

- name: Set up Prometheus.
  import_playbook: tasks/kubernetes/prometheus.yml
  tags: ['prometheus']

- name: Set up Drupal.
  import_playbook: tasks/kubernetes/drupal.yml
  tags: ['drupal']