ansible-roles/varnish/tasks/main.yml

---
- name: Install Varnish
  apt: name=varnish state=present

- name: Remove default varnish configuration files
  file:
    path: "{{ item }}"
    state: absent
  with_fileglob: "/etc/defaults/varnish*"

- name: Copy Varnish service configuration file
  copy:
    src: "/lib/systemd/system/varnish.service"
    dest: "/etc/systemd/system/"
    force: no

- name: Modify Varnish configuration file
  lineinfile:
    dest: "/etc/systemd/system/varnish.service"
    regexp: "^ExecStart="
    line: "ExecStart=/usr/sbin/varnishd -a 0.0.0.0:80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,2G -p thread_pools={{ thread_pools }} -p thread_pool_add_delay=2 -p thread_pool_min=500 -p thread_pool_max=5000"
  notify: reload systemctl