ansible-dhcpd/tasks/main.yml

---

- name: Configure DHCP relay in debconf
  debconf:
    name: 'isc-dhcp-relay'
    question: 'isc-dhcp-relay/{{ item.key }}'
    vtype: 'string'
    value: '{{ item.value }}'
  with_dict:
    servers:    '{{ dhcpd_relay_servers | join(" ") }}'
    interfaces: '{{ dhcpd_relay_interfaces | join(" ") }}'
    options:    '{{ dhcpd_relay_options }}'
  register: dhcpd_register_relay_debconf
  when: dhcpd_mode == 'relay'

- name: Install DHCP packages
  apt:
    name: '{{ item }}'
    state: 'present'
    install_recommends: False
  with_flattened:
    - '{{ dhcpd_base_packages_map[dhcpd_mode] }}'
    - [ '{{ "dhcp-probe" if (dhcpd_probe|d() and dhcpd_probe) else [] }}' ]

- name: Reconfigure ISC DHCP relay
  command: dpkg-reconfigure --frontend=noninteractive isc-dhcp-relay
  notify: [ 'Restart isc-dhcp-relay' ]
  when: dhcpd_register_relay_debconf|d() and dhcpd_register_relay_debconf.changed

- name: Get list of nameservers configured in /etc/resolv.conf
  shell: grep -E '^nameserver\s' /etc/resolv.conf | awk '{print $2}'
  register: dhcpd_register_nameservers
  changed_when: False
  when: dhcpd_mode == 'server'
  always_run: yes

- name: Convert list of nameservers to Ansible list
  set_fact:
    dhcpd_runtime_nameservers: "{{ dhcpd_register_nameservers.stdout_lines }}"
  when: (dhcpd_register_nameservers is defined and dhcpd_register_nameservers.stdout)

- name: Configure DHCP server
  template:
    src: '{{ item }}.j2'
    dest: '/{{ item }}'
    owner: 'root'
    group: 'root'
    mode: '0644'
  with_items: [ 'etc/default/isc-dhcp-server', 'etc/dhcp/dhcpd.conf' ]
  notify: [ 'Restart isc-dhcp-server' ]
  register: dhcpd_register_config
  when: dhcpd_mode == 'server'

- name: Make sure that included files exist
  file:
    path: '{{ item }}'
    state: 'touch'
    owner: 'root'
    group: 'root'
    mode: '0644'
  with_items: '{{ dhcpd_includes }}'
  notify: [ 'Restart isc-dhcp-server' ]
  when: ((item is defined and item) and dhcpd_mode == 'server' and
         (dhcpd_register_config is defined and dhcpd_register_config.changed))

- name: Make sure that IPv6 lease file exists
  command: touch /var/lib/dhcp/dhcpd6.leases creates=/var/lib/dhcp/dhcpd6.leases
  when: dhcpd_ipversion == '6'

- include: dhcp-probe.yml
  when: dhcpd_probe|d() and dhcpd_probe