Time Synchronization (4)

• chrony – Introduction (chrony-project.org) tool
  NTPv4 client, server and peer for hosts with intermittent links or uptime; chronyd plus chronyc
  System Administration #
• Welcome to NTPsec (ntpsec.org) tool
  Security-hardened fork of NTP Classic, audited and stripped down for high-assurance deployments
  Security Hardening #
• pool.ntp.org: the internet cluster of ntp servers (ntppool.org) organisation
  volunteer cluster of ~6,100 public time servers, the default NTP source for most distros; free
  System Administration #
• Welcome to The Linux PTP Project (Linux PTP Project) tool
  IEEE 1588 PTP daemons for Linux built on modern kernel APIs; backed by Network Time Foundation
  Kernel #