See the source code, systemd/src/basic/time-util.c. Specifically, if kernel discipline call adjtimex() returned without error, and not the initial state. Systemd defines 'syncronized' to be if NTP was ever used to tell Linux to adjust the clock. Basic NTP stats via timedatectl timesync-status are a relatively new thing, I don't think that option is available in Red Hat 7 or Ubuntu 18.04. It does not have robust means to discipline and monitor the clock. Personally, I replace it on most servers.Ībout the only way to set the time with timesyncd is manually: timedatectl set-time ' 00:40:16'. Repeated ntpdate, by which I mean not very good clock. (It also cannot talk to time hardware or PTP, only NTP protocol.) A little better than Timesyncd is an SNTP client that can set the time, but not discipline it gradually and continuously, nor filter remote NTP server based on quality. makestep on the CLI is for fixing NTP interactively when you don't want to restart chronyd. Not necessary usually, there is a corresponding config file directive, and chrony will steadily discipline the clock by itself. Have an idea of what your requirements are, one second accuracy can easily tolerate tens of milliseconds offset.Ĭhronyc makestep with no arguments will make the current adjustment immediately. On the command line, every variable can be queried.Ĭhronyc tracking will show the current offset. Going back in time is bad for some applications, so large steps often are not allowed once a system is running. For example, makestep 1.0 3 means in the first 3 updates after chronyd is started, an offset greater than 1 second sets the clock immediately. While editing nf, review when steps are allowed. It still may take a couple minutes to stabilize, be patient. I will assume chrony.Īdd iburst to your pool or server lines in your config to speed up the initial few packets. Do so if you require any monitoring of time performance. To use an actual NTP implementation, you need to install and configure one, chrony or maybe ntpd.

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