add-managed-ntp-support (#9027)

roles/kubernetes/preinstall/defaults/main.yml

@@ -62,3 +62,40 @@ pkg_install_retries: 4
 
 # Check if access_ip responds to ping. Set false if your firewall blocks ICMP.
 ping_access_ip: true
+
+## NTP Settings
+# Start the ntpd or chrony service and enable it at system boot.
+ntp_enabled: false
+# The package to install which provides NTP functionality.
+# The default is ntp for most platforms, or chrony on RHEL/CentOS 7 and later.
+# The ntp_package can be one of ['ntp','chrony']
+ntp_package: >-
+      {% if ansible_os_family == "RedHat" -%}
+      chrony
+      {%- else -%}
+      ntp
+      {%- endif -%}
+
+# Manage the NTP configuration file.
+ntp_manage_config: false
+# Specify the NTP servers
+# Only takes effect when ntp_manage_config is true.
+ntp_servers:
+  - "0.pool.ntp.org iburst"
+  - "1.pool.ntp.org iburst"
+  - "2.pool.ntp.org iburst"
+  - "3.pool.ntp.org iburst"
+# Restrict NTP access to these hosts.
+# Only takes effect when ntp_manage_config is true.
+ntp_restrict:
+  - "127.0.0.1"
+  - "::1"
+# The NTP driftfile path
+# Only takes effect when ntp_manage_config is true.
+ntp_driftfile: /var/lib/ntp/ntp.drift
+# Enable tinker panic is useful when running NTP in a VM environment.
+# Only takes effect when ntp_manage_config is true.
+ntp_tinker_panic: false
+
+# Force sync time immediately after the ntp installed, which is useful in in newly installed system.
+ntp_force_sync_immediately: false