chronyc

Command-line interface for the chrony NTP daemon

TLDR

Check synchronization status

$ chronyc tracking

List time sources

$ chronyc sources

Verbose source list

$ chronyc sources -v

Source statistics

$ chronyc sourcestats

Force time sync

$ chronyc makestep

Add NTP server

$ chronyc add server [pool.ntp.org]

Show number of online/offline sources

$ chronyc activity

Connect to a remote chrony daemon

$ chronyc -h [remote-host]

Interactive mode

$ chronyc

chronyc is the command-line interface for chronyd, the NTP daemon. Used to monitor synchronization status, manage time sources, and configure the daemon. Changes are not persistent across restarts.

PARAMETERS

-n

Don't resolve hostnames

-N

Print original hostnames as specified in config, not reverse DNS

-c

CSV output format

-m

Allow multiple commands on one line

-4

Resolve hostnames to IPv4 addresses only

-6

Resolve hostnames to IPv6 addresses only

-h host

Connect to remote chronyd

-p port

Specify port for remote chronyd connection

CONFIGURATION

/etc/chrony.conf

Permanent configuration for chronyd. Runtime changes via chronyc are lost on restart.

COMMANDS

tracking

Display system clock status and offset

sources

List NTP sources

sourcestats

Show source statistics

makestep

Force immediate clock correction

activity

Show online/offline source count

add server host

Add NTP server

delete address

Remove NTP source

burst good/max

Start rapid polling

offline / online

Set sources offline/online

ntpdata

Display NTP data for sources

INSTALL

sudo apt install chrony

sudo dnf install chrony

sudo pacman -S chrony

sudo apk add chrony

sudo zypper install chrony

brew install chrony

nix profile install nixpkgs#chrony

CAVEATS

Requires chronyd running. Runtime changes lost on restart. Sub-microsecond accuracy possible with hardware timestamping.