Ansible Role: NTP Cluster

Install and configure a Chrony NTP cluster with bidirectional server associations and orphan mode.

Supported Operating Systems

Operating System	Version
Ubuntu	24.04 LTS +

Variables

Variable	Required	Default	Description
ntp_upstream_servers	No	time.cloudflare.com, time.google.com	List of upstream NTP servers
ntp_cluster_peers	No	[]	List of cluster peers (hostname + ip)
ntp_allowed_subnets	No	[]	Subnets allowed to query this server
ntp_local_stratum	No	10	Stratum served when not synced (orphan mode)
ntp_driftfile_path	No	/var/lib/chrony/drift	Path to chrony driftfile
ntp_config_path	No	/etc/chrony/chrony.conf	Path to chrony configuration file
ntp_makestep_threshold	No	1	Makestep threshold in seconds
ntp_makestep_limit	No	3	Max clock adjustments before makestep stops
ntp_maxupdateskew	No	100	Max update skew for faster syncing

Example

ntp_upstream_servers:
  - "time.cloudflare.com"
  - "time.google.com"

ntp_cluster_peers:
  - hostname: "ntp01.example.com"
    ip: "10.0.0.1"
  - hostname: "ntp02.example.com"
    ip: "10.0.0.2"

ntp_allowed_subnets:
  - "10.0.0.0/24"
  - "192.168.1.0/24"

ntp_local_stratum: "10"
ntp_makestep_threshold: "1"
ntp_makestep_limit: "3"
ntp_maxupdateskew: "100"