Ansible role for creating a Swap file

swap.yml

- name: set swap_file variable
  set_fact:
    swap_file: /mnt/{{ swap_space }}.swap

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

- name: create swap file
  sudo: yes
  command: fallocate -l {{ swap_space }} {{ swap_file }}
  when: not swap_file_check.stat.exists

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

- name: format swap file
  sudo: yes
  command: mkswap {{ swap_file }}
  when: not swap_file_check.stat.exists

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

- name: turn on swap
  sudo: yes
  command: swapon -a

- name: set swapiness
  sudo: yes
  sysctl:
    name: vm.swappiness
    value: "1"

Great tool to create swap! I had to correct it though while using it on EC2/CentOS7/XFS. Apparently fallocate is not the right way to create swap files on XFS. swapon gives you an error. So I switched to plain dd instead. Everything else worked perfectly for me. Thanks!

I want to create swap on disk by using lvm module so that I can create swap vol conditional. lets say swap should be 2x memory when memory is <=4, 1x memory from 4-16 and 16 when memory is > 16. Please suggest.