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sys: add null driver

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Add a new clock driver that doesn't actually try to adjust the clock.
It allows chronyd to run without the capability to adjust/set the system
clock, e.g. in some containers. It can be enabled by the -x option.
This commit is contained in:
Miroslav Lichvar
2017-03-09 18:16:56 +01:00
parent 0ff449e6a6
commit c44346096c
7 changed files with 202 additions and 5 deletions
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doc/chronyd.adoc
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@@ -151,6 +151,13 @@ support this option.
This option will lock *chronyd* into RAM so that it will never be paged out.
This mode is only supported on Linux.
*-x*::
This option disables the control of the system clock. *chronyd* will not make
any adjustments of the clock, but it will still track its offset and frequency
relative to the estimated true time, and be able to operate as an NTP server.
This allows *chronyd* to run without the capability to adjust or set the system
clock (e.g. in some containers).
*-v*::
With this option *chronyd* will print version number to the terminal and exit.