REBASED: add support for chrony on EL7

defaults/main.yml

@@ -1,6 +1,8 @@
 ---
 ntp_enabled: true
 ntp_timezone: Etc/UTC
+ntp_package: ntp
+ntp_configfile: /etc/ntp.conf
 
 ntp_manage_config: false
 

tasks/main.yml

@@ -2,9 +2,13 @@
 - name: Include OS-specific variables.
   include_vars: "{{ ansible_os_family }}.yml"
 
+- name: Include OS- Release specific variables on EL6.
+  include_vars: RedHat6.yml
+  when: ansible_os_family == 'RedHat' and ansible_distribution_major_version == '6'
+
 - name: Ensure NTP-related packages are installed.
   package:
-    name: ntp
+    name: "{{ ntp_package }}"
     state: present
 
 - name: Ensure tzdata package is installed (Linux).
@@ -34,9 +38,9 @@
     enabled: false
   when: not (ntp_enabled | bool)
 
-- name: Generate ntp.conf file
+- name: Generate ntp configuration file
   template:
-    src: ntp.conf.j2
-    dest: /etc/ntp.conf
+    src: "{{ ntp_configfile |basename }}.j2"
+    dest: "{{ ntp_configfile }}"
   notify: restart ntp
   when: ntp_manage_config | bool

templates/chrony.conf.j2

@@ -0,0 +1,40 @@
+# {{ ansible_managed }}
+
+# These servers were defined in the installation:
+{% for server in ntp_servers %}
+server {{ server }} iburst
+{% endfor %}
+# Use public servers from the pool.ntp.org project.
+# Please consider joining the pool (http://www.pool.ntp.org/join.html).
+
+# Record the rate at which the system clock gains/losses time.
+driftfile /var/lib/chrony/drift
+
+# Allow the system clock to be stepped in the first three updates
+# if its offset is larger than 1 second.
+makestep 1.0 3
+
+# Enable kernel synchronization of the real-time clock (RTC).
+rtcsync
+
+# Enable hardware timestamping on all interfaces that support it.
+#hwtimestamp *
+
+# Increase the minimum number of selectable sources required to adjust
+# the system clock.
+#minsources 2
+
+# Allow NTP client access from local network.
+#allow 192.168.0.0/16
+
+# Serve time even if not synchronized to a time source.
+#local stratum 10
+
+# Specify file containing keys for NTP authentication.
+#keyfile /etc/chrony.keys
+
+# Specify directory for log files.
+logdir /var/log/chrony
+
+# Select which information is logged.
+#log measurements statistics tracking

vars/RedHat.yml

@@ -1,4 +1,5 @@
 ---
-ntp_daemon: ntpd
+ntp_daemon: chronyd
+ntp_configfile: /etc/chrony.conf
+ntp_package: chrony
 ntp_tzdata_package: tzdata
-ntp_driftfile: /var/lib/ntp/drift

vars/RedHat6.yml

@@ -0,0 +1,6 @@
+---
+ntp_daemon: ntpd
+ntp_configfile: /etc/ntp.conf
+ntp_package: ntp
+ntp_tzdata_package: tzdata
+ntp_driftfile: /var/lib/ntp/drift