.. _cce-ntp: Network Time Protocol (NTP) *************************** The NTP module configures NTP services. If NTP is not installed on the system, but NTP configuration is specified, NTP will be installed. For a full list of keys, refer to the :ref:`NTP module ` schema. Available keys: =============== - ``servers``: List of NTP servers to sync with. - ``pools``: List of NTP pool servers to sync with. Pools are typically DNS hostnames which resolve to different specific servers to load balance a set of services. Each server in the list will be added in list-order in the format: .. code-block:: yaml [pool|server] iburst If no servers or pools are defined but NTP is enabled, then cloud-init will render the distro default list of pools: .. code-block:: yaml pools = [ '0.{distro}.pool.ntp.org', '1.{distro}.pool.ntp.org', '2.{distro}.pool.ntp.org', '3.{distro}.pool.ntp.org', ] So putting these together, we can see a straightforward example: .. code-block:: yaml #cloud-config ntp: pools: ['0.company.pool.ntp.org', '1.company.pool.ntp.org', 'ntp.myorg.org'] servers: ['my.ntp.server.local', 'ntp.ubuntu.com', '192.168.23.2'] Override NTP with chrony ======================== Here we override NTP with chrony configuration on Ubuntu. The example uses cloud-init's default chrony configuration. .. literalinclude:: ../../../module-docs/cc_ntp/example1.yaml :language: yaml :linenos: Custom NTP client config ======================== This example provides a custom NTP client configuration. .. literalinclude:: ../../../module-docs/cc_ntp/example2.yaml :language: yaml :linenos: