![]() Ntpdate is now considered deprecated in favor of timedatectl (or chrony) and is no longer installed by default. This ensures that no two time-syncing services can conflict with each other. If chrony is installed, timedatectl steps back to let chrony handle timekeeping. It also stores time updates locally, so that after reboots the time monotonically advances (if applicable). ![]() So, on top of the one-shot action that ntpdate provided on boot and network activation, timesyncd now regularly checks and keeps your local time in sync. Timesyncd replaces not only ntpdate, but also the client portion of chrony (formerly ntpd). Since Ubuntu 16.04, timedatectl/ timesyncd (which are part of systemd) replace most of ntpdate/ ntp. ![]() Users can also optionally use chrony to serve NTP. See our guide If you would like to know how to configure timedatectl and timesyncd. Luckily, all that complexity is hidden from you!īy default, Ubuntu uses timedatectl/ timesyncd to synchronise time, and they are available by default. It must factor in communication delays and adjust the time in a way that does not upset all the other processes that run on the server. The client software is also a lot more complex than you might expect. There are three tiers of NTP servers tier one NTP servers are connected to atomic clocks, while tier two and tier three three servers spread the load of actually handling requests across the Internet. Basically, a client requests the current time from a server, and uses it to set its own clock.īehind this simple description, there is a lot of complexity. Network Time Protocol (NTP) is a networking protocol for synchronising time over a network. Multi-node configuration with Docker-Composeĭistributed Replicated Block Device (DRBD)
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