The iburst option speeds up the initial synchronisation. The maximum length of the line is characters. The default configuration is for chronyd to only accept commands from a local instance of chronyc , but chronyc can be used to alter the configuration so that chronyd will allow external control. There are four forms of the offline command. Post by Unruh Post by Tony Houghton the rtcfile.

Uploader: Tegul
Date Added: 21 August 2012
File Size: 63.13 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 44899
Price: Free* [*Free Regsitration Required]

The pool directive can be used for names that resolve to multiple addresses.

If it is another reference clock specified with the lock option in the refclock directive, the offset between the two reference clocks must be smaller than 0. The default value is 3 seconds.

When a leap second is inserted, the last day of June or December has an extra second Normally chronyd will cause the system to gradually correct any time offset, by slowing down or speeding up the clock as required. On systems other than Linux, the address of the computer needs to be already configured when chronyd is started. There are a number of reasons, see the following questions.

The default is 4 16 seconds. This option specifies a correction in seconds which will be applied to offsets measured with this source. If a large offset has been accumulated, it may take a very long time to smooth it out.

Configuring NTP Using the chrony Suite

Access to the server should be carefully controlled. The path where the socket should be created is described in the gpsd 8 man page. The maxclockerror directive sets the maximum assumed dtc error that the system clock can gain on its own between clock updates.


The configuration file might contain comment lines.

chrony – Manual for version

Problems that may arise with timed are: Using chronyc for Remote Administration To configure chrony to connect to a remote instance of chronydissue a command in the following format: The bindcmdaddress directive allows you to specify the network interface to which chronyd will listen for monitoring rgc packets issued by chronyc. This option logs the raw NTP measurements and related information to a file called measurements. Attempting to correct such an error by slewing might not be sensible, since it might take several hours to correct the error by this means.

It chriny to be corrected with the offset option.

There are four options:. This provides an additional level of access restriction above that available through the deny mechanism. The first parameter in each case 30 or 60 respectively is the interval in seconds between broadcast packets being sent. Are there any plans to support Windows? This option also effectively disables server support for the NTP interleaved mode.

The default value is 8.

Running chrony and rtc

The local keyword is used to allow chronyd to appear synchronized to real time from the viewpoint of clients polling it, even if it has no current synchronization source. A consequence of this is that there will be a period when the system clock as read by other programs using the gettimeofday system call, or by the date command in the shell will be different from chronyd ‘s estimate of the current true time which it reports to NTP clients when it is operating in server mode.


To tell chronyd when to start and finish sampling the servers, the online and offline commands of chronyc need to be used. Valid measurements with corresponding compensations are logged to the tempcomp.

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.

This shows the stratum of the source, as reported in its most recently received sample. This option sets the stratum of the server which will be reported to clients when the local reference is active. The time it would take for the smoothing process to get to zero offset and frequency if there were no more updates. The normal configuration should be sufficient for mobile and virtual devices xhrony connect intermittently.

The second directive allows any node with an IPv4 address of the form 1.