ansible-freebsd-jailhost-tools/tasks/jail/update_etc_hosts.yml

# IMPORTANT: after the IP that is 2 TABULATOR characters !
- name: Getting matching /etc/hosts files (IPv4)
  command: >-
    /bin/sh -c "/usr/bin/grep -lE
    '^[0-9]+.[0-9]+.[0-9]+.[0-9]+		jail-{{ jail_name }}'
    /etc/hosts {{ static_jails_path }}/*/etc/hosts {{ dynamic_jails_path }}/*/etc/hosts"
  ignore_errors: yes
  failed_when: false
  register: matching_hosts_files_v4

- name: Replacing appropriate jail names with new IP addresses in /etc/hosts files (IPv4)
  lineinfile:
    dest: '{{ filename }}'
    regexp: '^\d+\.\d+\.\d+\.\d+		jail-{{ jail_name }}'
    line: '{{ vars["jail_" + jail_name + "_new_ip4"] }}		jail-{{ jail_name }}'
    state: present
  with_items: '{{ matching_hosts_files_v4.stdout_lines }}'
  loop_control:
    loop_var: filename

- block:
  # IMPORTANT: after the IP that is 2 TABULATOR characters !
  - name: Getting matching /etc/hosts files (IPv6)
    command: >-
      /bin/sh -c "/usr/bin/grep -lE
      '^[0-9a-f:]+		jail-{{ jail_name }}'
      /etc/hosts {{ static_jails_path }}/*/etc/hosts {{ dynamic_jails_path }}/*/etc/hosts"
    ignore_errors: yes
    failed_when: false
    register: matching_hosts_files_v6

  - name: Replacing appropriate jail names with new IP addresses in /etc/hosts files (IPv6)
    lineinfile:
      dest: '{{ filename }}'
      regexp: '^[0-9a-f:]+		jail-{{ jail_name }}'
      line: '{{ jail_THIS_with_ip6 }}		jail-{{ jail_name }}'
      state: present
    with_items: '{{ matching_hosts_files_v6.stdout_lines }}'
    loop_control:
      loop_var: filename
  when: 'jail_THIS_with_ip6 != False'

- name: Sending HUP to any any crucial processes to reload their /etc/hosts
  command:
    /usr/bin/killall -HUP dnsmasq syslogd nginx
  failed_when: false