Bug 44246 – univention-join sets time set via "rdate -n" but not "hwclock --systohc", which is lost after reboot

Bug 44246 - univention-join sets time set via "rdate -n" but not "hwclock --systohc", which is lost after reboot


Summary:	univention-join sets time set via "rdate -n" but not "hwclock --systohc", whi...

Status:	REOPENED

Product:	UCS
Classification:	Unclassified
Component:	Join (univention-join)
Version:	UCS 5.0
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	---
Assigned To:	UCS maintainers
QA Contact:	UCS maintainers

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Blocks:
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Reported:	2017-04-03 19:59 CEST by Arvid Requate
Modified:	2020-06-22 14:58 CEST (History)
CC List:	3 users (show)

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What kind of report is it?:	Development Internal
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Description Arvid Requate

2017-04-03 19:59:50 CEST

After the update to UCS 4.2 I have this behavior on an Samba/AD Master

root@master10:~# date
Mo 23. Nov 23:54:47 CET 2015
root@master10:~# rdate -n 10.200.8.1                                                            
Mon Apr  3 19:52:53 CEST 2017
root@master10:~# reboot
[...]
root@master10:~# date
Mo 23. Nov 23:54:57 CET 2015


So the hardware clock is not set to the system time at shutdown.

Maybe we should adjust the locations where we run rdate to also sync the hardware clock to the system time:

root@master10:~# hwclock --systohc

Comment 1 Philipp Hahn

2017-04-04 17:10:15 CEST

There is "/lib/systemd/system/hwclock-save.service", but as ntpd is installed on all UCS system roles, it is disabled by ConditionalFileIsExecutable.
Use "ucr set timeserver=0.europe.pool.ntp.org" (or whatever) and wait for at least 11 minutes after time has been synchronized; then the Linux kernel itself will update the RTC.

(if you use `rdate` by hand, you're supposed to use `hwclock --systohc --utc` by hand as well as you must know what you're doing - doing it automatically is wrong)

Comment 2 Arvid Requate

2017-04-04 19:34:07 CEST

> (if you use `rdate` by hand, you're supposed to use `hwclock --systohc --utc` by hand as well as you must know what you're doing - doing it automatically is wrong)

Well, that's the thing, we do rdate in univention-join.

Comment 3 Florian Best

2020-06-22 14:58:43 CEST

Still rdate in:

base/univention-ssl/debian/univention-ssl.postinst
base/univention-lib/python/admember.py
management/univention-join/univention-join
...