ansible/tasks/swap.yml

# use variables:
#   swap_file_size_mb
#   swap_file_path

---
- name: Touch an empty file that we will use for swap
  ansible.builtin.copy:
    content: ""
    dest: "{{ swap_file_path }}"
    force: no
  register: swap_touch
  tags:
    - swap

- name: On BTRFS we need NoCOW
  ansible.builtin.file:
    path: "{{ swap_file_path }}"
    attr: +C
  when:
    - swap_touch.changed
    - ansible_distribution == 'Fedora'
  tags:
    - swap

- name: Create swap file
  ansible.builtin.command:
    cmd: "dd if=/dev/zero of={{ swap_file_path }} bs=1024 count={{ swap_file_size_mb }}k"
  when: swap_touch.changed
  tags:
    - swap.file.create
    - swap

- name: Change swap file permissions
  ansible.builtin.file: path="{{ swap_file_path }}"
        owner=root
        group=root
        mode=0600
  tags:
    - swap.file.permissions
    - swap

- name: Check swap file type
  ansible.builtin.command: file {{ swap_file_path }}
  register: swapfile
  changed_when: false
  tags:
    - swap.file.mkswap
    - swap

- name: Make swap file
  filesystem:
    fstype: swap
    dev: "{{ swap_file_path }}"
  when: swapfile.stdout.find('swap file') == -1
  tags:
    - swap.file.mkswap
    - swap

- name: Write swap entry in fstab
  mount: path=none
         src={{ swap_file_path }}
         fstype=swap
         opts=sw
         passno=0
         dump=0
         state=present
  register: swap_fstab_added
  tags:
    - swap.fstab
    - swap

- name: Mount swap
  ansible.builtin.command: "swapon -a"
  # when: ansible_swaptotal_mb|int < 1
  when: swap_fstab_added.changed
  tags:
    - swap.file.swapon
    - swap
  notify: Restart swap.swap

- name: Remove zram-generator-defaults
  ansible.builtin.package:
    name: zram-generator-defaults
    state: absent
  register: remove_zram_generator
  tags:
    - swap.file.dropzrampackage
    - swap

- name: Disable zram0
  ansible.builtin.shell: swapoff /dev/zram0
  tags:
    - swap
    - swap.file.swapoffzram
  when:
    - remove_zram_generator.changed

# - name: Start swap.swap service
#   service: state=started enabled=yes name="swap.swap"