home-cluster/ansible/playbooks/cluster-prepare.yaml

---
- name: Prepare System
  hosts: all
  become: true
  gather_facts: true
  any_errors_fatal: true
  pre_tasks:
    - name: Pausing for 5 seconds...
      ansible.builtin.pause:
        seconds: 5
  tasks:
    - name: Locale
      block:
        - name: Locale | Set timezone
          community.general.timezone:
            name: "{{ timezone | default('Etc/UTC') }}"

    - name: Networking
      notify: Restart systemd-networkd
      block:
        - name: Networking | Set hostname to inventory hostname
          ansible.builtin.hostname:
            name: "{{ inventory_hostname }}"
        - name: Networking | Update hosts file to include inventory hostname
          ansible.builtin.blockinfile:
            path: /etc/hosts
            block: |
              127.0.1.1   {{ inventory_hostname }}
        # https://github.com/cilium/cilium/issues/18706
        - name: Networking | Cilium (1)
          ansible.builtin.lineinfile:
            dest: /etc/systemd/networkd.conf
            regexp: ManageForeignRoutingPolicyRules
            line: ManageForeignRoutingPolicyRules=no
        - name: Networking | Cilium (2)
          ansible.builtin.lineinfile:
            dest: /etc/systemd/networkd.conf
            regexp: ManageForeignRoutes
            line: ManageForeignRoutes=no

    - name: Packages
      block:
        - name: Packages | Install required packages
          ansible.builtin.apt:
            name: hdparm,htop,ipvsadm,lm-sensors,nano,nfs-common,nvme-cli,
              socat,python3-kubernetes,python3-yaml
            state: present
            update_cache: true
        - name: Packages | RasPi packages
          ansible.builtin.apt:
            name: ["linux-modules-extra-raspi"]
            install_recommends: false
          notify: Reboot
          when: "'raspi' in ansible_kernel"

    - name: System Configuration (1)
      block:
        - name: System Configuration (1) | Disable ufw
          ansible.builtin.systemd:
            service: ufw.service
            enabled: false
            masked: true
            state: stopped
          register: stop_service
          failed_when:
            - stop_service.failed == true
            - '"Could not find the requested service" not in stop_service.msg'
        - name: System Configuration (1) | Enable fstrim
          ansible.builtin.systemd:
            service: fstrim.timer
            enabled: true

    - name: System Configuration (2)
      block:
        - name: System Configuration (2) | Enable kernel modules now
          community.general.modprobe:
            name: "{{ item }}"
            state: present
          loop: ["br_netfilter", "ceph", "ip_vs", "ip_vs_rr", "nbd", "overlay", "rbd"]
        - name: System Configuration (2) | Enable kernel modules on boot
          ansible.builtin.copy:
            mode: "0644"
            content: "{{ item }}"
            dest: "/etc/modules-load.d/{{ item }}.conf"
          loop: ["br_netfilter", "ceph", "ip_vs", "ip_vs_rr", "nbd", "overlay", "rbd"]
        - name: System Configuration (2) | Set sysctls
          ansible.posix.sysctl:
            name: "{{ item.key }}"
            value: "{{ item.value }}"
            sysctl_file: /etc/sysctl.d/99-kubernetes.conf
            reload: true
          with_dict: "{{ sysctl_config }}"
          vars:
            sysctl_config:
              fs.inotify.max_queued_events: 65536
              fs.inotify.max_user_watches: 524288
              fs.inotify.max_user_instances: 8192
        - name: System Configuration (2) | Disable swap at runtime
          ansible.builtin.command: swapoff -a
          when: ansible_swaptotal_mb > 0
        - name: System Configuration (2) | Disable swap at boot
          ansible.posix.mount:
            name: "{{ item }}"
            fstype: swap
            state: absent
          loop: ["none", "swap"]
      notify: Reboot

  handlers:
    - name: Restart systemd-networkd
      ansible.builtin.systemd:
        service: systemd-networkd
        state: restarted
    - name: Reboot
      ansible.builtin.reboot:
        msg: Rebooting nodes
        reboot_timeout: 3600