swapfile.yaml

---
- hosts: all
  sudo: yes

  tasks:
    - name: "test for swap partition"
      shell: 'sudo swapon -s | grep -E "^/"'
      register: swapfile
      ignore_errors: yes

    - name: "create swapfile"
      when: swapfile|failed
      shell: "sudo dd if=/dev/zero of=/swapfile bs=1024 count=256k"

    - name: "set swapfile permissions"
      when: swapfile|failed
      file: path=/swapfile
            owner=root
            group=root
            mode=0600

    - name: "prepare swapfile"
      when: swapfile|failed
      shell: "sudo mkswap /swapfile"

    - name: "enable swap"
      when: swapfile|failed
      shell: "sudo swapon /swapfile"

    - name: "add swapfile"
      when: swapfile|failed
      lineinfile: dest=/etc/fstab
                  regexp="^/swapfile"
                  state=present
                  line="/swapfile       none    swap    sw      0       0"

    - name: "set swappiness (temporarily)"
      when: swapfile|failed
      shell: "echo 1 | sudo tee /proc/sys/vm/swappiness"

    - name: "set swappiness (permanent)"
      when: swapfile|failed
      lineinfile: dest=/etc/sysctl.conf
                  regexp="^vm.swappiness"
                  state=present
                  line="vm.swappiness = 1"

This is an Ansible playbook to add swap to a server based on a DigitalOcean tutorial.