Hi Michael,
Am 09.12.2016 um 12:43 schrieb Michael Chapman:
On Fri, 9 Dec 2016, Michael Chapman wrote:
[...]
You will need to use the .service extension on at least the first of
those links. systemd will only consider links in that directory that
have valid unit names. (I'm pretty sure the intermediate link's name
doesn't matter, but I wouldn't want to rely on that -- best just to
use valid full unit names everywhere.)
Oh, something else I thought of... I'm pretty sure it doesn't make sense
having a symlink to /dev/null inside a .wants directory. Really, only
the name of those links are considered. The links aren't actually
dereferenced.
I have to disagree on this, the name does not matter, the link target
does matter (see log below, the relevant status is marked with <---).
If I create a link named foo pointing to
/lib/systemd/system/systemd-timesyncd.service the service is enabled and
started. If I delete the link, the service is disabled and not started.
Everything is fine. But it requires write access to /etc.
If I create a link structure like this:
/etc/systemd/system/sysinit.target.wants/systemd-timesyncd ->
/mnt/writeable/systemd-timesyncd ->
/lib/systemd/system/systemd-timesyncd.service
the service is also started (Good).
But if I then change the structure to
/etc/systemd/system/sysinit.target.wants/systemd-timesyncd ->
/mnt/writeable/systemd-timesyncd ->
/dev/null
timedatectl still says "NTP is enabled".
And at this point I don't know how to proceed.
Best regards,
André
Log:
$ ssh [email protected]
Password:
root@apalis-imx6:~# rm
/etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service
root@apalis-imx6:~# reboot
Connection to 192.168.16.14 closed by remote host.
$ ssh [email protected]
Password:
root@apalis-imx6:~# systemctl status systemd-timesyncd
● systemd-timesyncd.service - Network Time Synchronization
Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service;
disabled; vendor preset: enabled) <---
Active: inactive (dead)
Docs: man:systemd-timesyncd.service(8)
root@apalis-imx6:~# timedatectl
Local time: Fri 2016-12-09 13:20:46 UTC
Universal time: Fri 2016-12-09 13:20:46 UTC
RTC time: n/a
Time zone: Universal (UTC, +0000)
NTP enabled: no <----
NTP synchronized: no
RTC in local TZ: no
DST active: n/a
root@apalis-imx6:~# cd /etc/systemd/system/sysinit.target.wants/
root@apalis-imx6:/etc/systemd/system/sysinit.target.wants# mount-rw /
root@apalis-imx6:/etc/systemd/system/sysinit.target.wants# ln -s
/lib/systemd/system/systemd-timesyncd.service foo
root@apalis-imx6:/etc/systemd/system/sysinit.target.wants# ll foo
lrwxrwxrwx 1 root root 45 Dec 9 13:21 foo ->
/lib/systemd/system/systemd-timesyncd.service
root@apalis-imx6:/etc/systemd/system/sysinit.target.wants# reboot
Connection to 192.168.16.14 closed by remote host.
$ ssh [email protected]
Warning: Permanently added '192.168.16.14' (ECDSA) to the list of known
hosts.
Password:
root@apalis-imx6:~# systemctl status systemd-timesyncd
● systemd-timesyncd.service - Network Time Synchronization
Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service;
enabled; vendor preset: enabled) <---
Active: inactive (dead)
Docs: man:systemd-timesyncd.service(8)
root@apalis-imx6:~# timedatectl
Local time: Fri 2016-12-09 13:21:51 UTC
Universal time: Fri 2016-12-09 13:21:51 UTC
RTC time: n/a
Time zone: Universal (UTC, +0000)
NTP enabled: yes <---
NTP synchronized: no
RTC in local TZ: no
DST active: n/a
root@apalis-imx6:~#
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