The offline keyword indicates that the servers start in an offline state, and that they should not be contacted until chronyd receives notification from chronyc that the link to the internet is present. The default value is 1. This option specifies the permissions of the shared memory segment created by chronyd. The filter can be one of the following: A value of indicates that a valid reply was received for all from the last eight transmissions. On other systems, chronyd forks into two processes.

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Checking the Status of chronyd To check the status of chronydissue the following command: The corrtimeratio directive sets the ratio between the duration in which the clock is slewed for an average correction according to the source history and the interval in which the corrections are done usually the NTP polling interval. As long as the offset of the NMEA reference clock stays below 0.

The pidfile directive allows the name to be changed, e. The default is to connect to the local daemon.

Note that the settime command can be enabled at run-time using the manual command in chronyc. Each licensee is addressed as “you”.

This option is normally used on chronyy in an isolated network, where several computers are required to synchronise to one other, this being the “master” which is kept vaguely in line with real time by manual input. This can be useful when the refclock provides time with a stratum other than 0.


One is to use the rtcsync directive, which tells chronyd to enable a kernel mode which sets the RTC from the system clock every 11 minutes. Changes made using chronyc are not chrong, they will be lost after a chronyd restart.

This directive enables response rate limiting for command packets. Comment 20 Steve Tyler This option can be used to compensate a constant error.

Configuring NTP Using the chrony Suite

The k0 coefficient can be used to get the results in that range. The maximum allowed slew rate can be set by the maxslewrate directive. Setting maxdistance to a larger value rfc be useful to allow synchronisation with a server that only has a very infrequent connection to its sources and can accumulate a large dispersion between updates of its clock. Access to the server should be carefully controlled. The clients will automatically replace the servers when chroyn become unreachable, or otherwise unsuitable for synchronisation, with new servers from the pool.

chrony – Frequently Asked Questions

These histories are created by using the dump command in chronycor by setting the dumponexit directive in the configuration file. You can check the root dispersion of the server with the chromy ‘s ntpdata crony. The following directives may be particularly useful: Using your editor running as rootadd the addresses of four NTP servers as follows: Post by Mauro Condarelli Usage: The leapsectz directive must be used with this option and the database must be kept up to date in order for this correction to work as expected.


What happens if the network connection is dropped without using chronyc ‘s offline command first? Each directive rfc the configuration file is placed on a separate line.

The leaponly option is useful in a combination with the leapsecmode slew option see section leapsecmode to allow clients use multiple time smoothing servers safely. This can be useful when maintaining configuration on multiple hosts to keep the differences chhrony separate files. The maximum length of the line is characters. The default is 1. This option sets the NTP version of packets sent to the server.

The burst command tells chronyd to make a set of measurements to each of its NTP sources over a short duration rather than the usual periodic measurements that it makes.

I chony it later gradually corrected itself, but I’m not sure. This is, at time of writing, only available in Linux.