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doc: update chrony.conf man page for recent changes

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Miroslav Lichvar 2018-06-22 12:09:31 +02:00
parent 2c47602c33
commit b33b682356
1 changed files with 13 additions and 10 deletions
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doc/chrony.conf.adoc
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@ -72,24 +72,27 @@ polling interval should not drop below 32 seconds. The default is 6 (64
seconds), the minimum is -4 (1/16th of a second), and the maximum is 24 (6 seconds), the minimum is -4 (1/16th of a second), and the maximum is 24 (6
months). Note that intervals shorter than 6 (64 seconds) should generally not months). Note that intervals shorter than 6 (64 seconds) should generally not
be used with public servers on the Internet, because it might be considered be used with public servers on the Internet, because it might be considered
abuse. abuse. A sub-second interval will be enabled only when the server is reachable
and the round-trip delay is shorter than 10 milliseconds, i.e. the server
should be in a local network.
*maxpoll* _poll_::: *maxpoll* _poll_:::
This option specifies the maximum interval between requests sent to the server This option specifies the maximum interval between requests sent to the server
as a power of 2 in seconds. For example, *maxpoll 9* indicates that the polling as a power of 2 in seconds. For example, *maxpoll 9* indicates that the polling
interval should stay at or below 9 (512 seconds). The default is 10 (1024 interval should stay at or below 9 (512 seconds). The default is 10 (1024
seconds), the minimum is 0 (1 second), and the maximum is 24 (6 months). seconds), the minimum is -4 (1/16th of a second), and the maximum is 24 (6
months).
*iburst*::: *iburst*:::
With this option, the interval between the first four requests sent to the With this option, the interval between the first four requests sent to the
server will be 2 seconds instead of the interval specified by the *minpoll* server will be 2 seconds or less instead of the interval specified by the
option, which allows *chronyd* to make the first update of the clock shortly *minpoll* option, which allows *chronyd* to make the first update of the clock
after start. shortly after start.
*burst*::: *burst*:::
With this option, *chronyd* will shorten the interval between up to four With this option, *chronyd* will shorten the interval between up to four
requests to 2 seconds when it cannot get a good measurement from the server. requests to 2 seconds or less when it cannot get a good measurement from the
The number of requests in the burst is limited by the current polling interval server. The number of requests in the burst is limited by the current polling
to keep the average interval at or above the minimum interval, i.e. the current interval to keep the average interval at or above the minimum interval, i.e.
interval needs to be at least two times longer than the minimum interval in the current interval needs to be at least two times longer than the minimum
order to allow a burst with two requests. interval in order to allow a burst with two requests.
*key* _ID_::: *key* _ID_:::
The NTP protocol supports a message authentication code (MAC) to prevent The NTP protocol supports a message authentication code (MAC) to prevent
computers having their system time upset by rogue packets being sent to them. computers having their system time upset by rogue packets being sent to them.