swap.yml

- hosts: all
  become: true
  tasks:
  - name: set swap_file variable
    set_fact:
      swap_file: /swapfile.swap

  - name: check if swap file exists
    stat:
      path: "{{ swap_file }}"
    register: swap_file_check

  - name: create swap file
    command: fallocate -l 8G {{ swap_file }}
    when: not swap_file_check.stat.exists

  - name: Create swap space
    command: dd if=/dev/zero of=/extraswap bs=1M count=8192
    when: not swap_file_check.stat.exists

  - name: set permissions on swap file
    file:
      path: "{{ swap_file }}"
      mode: 0600

  - name: format swap file
    command: /usr/sbin/mkswap {{ swap_file }}
    when: not swap_file_check.stat.exists

  - name: add to fstab
    lineinfile:
      dest: /etc/fstab
      regexp: "{{ swap_file }}"
      line: "{{ swap_file }} none swap sw 0 0"

  - name: turn on swap
    command: /usr/sbin/swapon -a

  - name: set swapiness
    sysctl:
      name: vm.swappiness
      value: "80"

  - name: Check if zswap is enabled
    lineinfile:
      backup: true
      path: /etc/default/grub
      regexp: '^GRUB_CMDLINE_LINUX=".*zswap.enabled=1.*'
      state: absent
    check_mode: true
    register: grub_cmdline_check
    changed_when: false

  - name: Enable zswap at boot
    lineinfile:
      backrefs: true
      path: /etc/default/grub
      regexp: "^(GRUB_CMDLINE_LINUX=\".*)\"$"
      line: '\1 zswap.enabled=1 zswap.compressor=zstd zswap.max_pool_percent=25 zswap.zpool=z3fold"'
    when: grub_cmdline_check.found == 0

  - name: update-grub
    command: /usr/sbin/update-grub2

  - name: Add Modules to Kernel
    lineinfile:
      dest: /etc/initramfs-tools/modules
      regexp: "zstd"
      line: "zstd\nz3fold"

  - name: Update initramfs
    command: update-initramfs -u