About the chronyc Service Utility

The chronyc utility is a tool for managing the chronyd service, displaying information about the service's operation, or changing the service's configuration.

The command operates in two modes:

Non interactive mode: In this mode, you use the following syntax:
```
sudo chronyc subcommand
```

Interactive mode: Typing the command by itself activates the interactive mode and displays the chronyc> prompt. From this prompt you can issue chronyc subcommands.

sudo chronyc

chronyc>

From the prompt, you can issue the different chronyc subcommands as needed. The following examples show the information that's generated by the sources, sourcestats, and tracking subcommands:

chronyc> sources

210 Number of sources = 4
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^+ service1-eth3.debrecen.hp     2   6    37    21  -2117us[-2302us] +/-   50ms
^* ns2.telecom.lt                2   6    37    21   -811us[ -997us] +/-   40ms
^+ strato-ssd.vpn0.de            2   6    37    21   +408us[ +223us] +/-   78ms
^+ kvm1.websters-computers.c     2   6    37    22  +2139us[+1956us] +/-   54ms

chronyc> sourcestats

210 Number of sources = 4
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
service1-eth3.debrecen.hp   5   4   259     -0.394     41.803  -2706us   502us
ns2.telecom.lt              5   4   260     -3.948     61.422   +822us   813us
strato-ssd.vpn0.de          5   3   259      1.609     68.932   -581us   801us
kvm1.websters-computers.c   5   5   258     -0.263      9.586  +2008us   118us

chronyc> tracking


Reference ID    : 212.59.0.2 (ns2.telecom.lt)
Stratum         : 3
Ref time (UTC)  : Tue Sep 30 12:33:16 2014
System time     : 0.000354079 seconds slow of NTP time
Last offset     : -0.000186183 seconds
RMS offset      : 0.000186183 seconds
Frequency       : 28.734 ppm slow
Residual freq   : -0.489 ppm
Skew            : 11.013 ppm
Root delay      : 0.065965 seconds
Root dispersion : 0.007010 seconds
Update interval : 64.4 seconds
Leap status     : Normal

To quit using the interactive mode, type exit.

Note:

Any changes you implement with the chronyc command are effective only until the next restart of the chronyd daemon. To make the changes permanent, you must enter these in the /etc/chrony.conf file. See chronyd Configuration File Examples.

For more information, see the chronyc(1) manual page and files in the /usr/share/doc/chrony/ directory.