Ansible and NTP example

hosts

[us_east:children]
us_east_dmz_servers
us_east_db_servers

[us_east_dmz_servers]
server1

[us_east_db_servers]
server2

# These variables can also be specified in
# group_vars/us_east_dmz_servers

[us_east_dmz_servers:vars]
ntp_servers="10.212.1.128,10.212.129"

[us_east_db_servers:vars]
ntp_servers="10.212.1.123,10.212.124"

ntp-config.yml

---
- hosts: all
  tasks:
  - name: Write the ntp config file
    template: src=ntp.conf.j2 dest=/tmp/ntp.conf backup=yes
    notify: restart ntp

  handlers:
  - name: restart ntp
    service: name=ntpd state=restarted enabled=yes
    notify: update time now

  - name: update time now
    shell: ntpdate -u {{ ntp_servers.split(',')[0] }}

ntp.conf.j2

driftfile /var/lib/ntp/drift
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery

restrict 127.0.0.1
restrict -6 ::1

{% for i in ntp_servers.split(',') %}
server {{ i }} iburst
{% endfor %}

includefile /etc/ntp/crypto/pst
keys /etc/ntp/keys