As discussed on IRC:
- the default of -g is also going along with a default of jumping any time >a
threshhold ONCE.
-x can change that
To be sure I tested that on Xenial:
$ timedatectl
Local time: Thu 2017-06-29 15:58:29 UTC
Universal time: Thu 2017-06-29 15:58:29 UTC
RTC time: Thu 2017-06-29 15:58:29
Time zone: Etc/UTC (UTC, +0000)
Network time on: yes
NTP synchronized: yes
RTC in local TZ: no
ubuntu@x-ntp-skip-test:~$ sudo timedatectl set-ntp false
ubuntu@x-ntp-skip-test:~$ sudo timedatectl set-time 01:02:03
ubuntu@x-ntp-skip-test:~$ timedatectl
Local time: Thu 2017-06-29 01:02:05 UTC
Universal time: Thu 2017-06-29 01:02:05 UTC
RTC time: Thu 2017-06-29 01:02:05
Time zone: Etc/UTC (UTC, +0000)
Network time on: no
NTP synchronized: no
RTC in local TZ: no
$ sudo add-apt-repository ppa:ci-train-ppa-service/2828
[...]
$ sudo apt install ntp
[...]
$ systemctl status ntp
● ntp.service - LSB: Start NTP daemon
Loaded: loaded (/etc/init.d/ntp; bad; vendor preset: enabled)
Active: active (running) since Thu 2017-06-29 01:04:36 UTC; 14h ago
[...]
$ timedatectl
Local time: Thu 2017-06-29 16:02:50 UTC
Universal time: Thu 2017-06-29 16:02:50 UTC
RTC time: Thu 2017-06-29 01:05:33
Watch the time the service was started and the time it has now.
It it did warp once initially as it is intended.
If I skew the time later it will not instant-reset again.
Then I dropped the -g from the options to be sure it is this what makes it work
and it did not time warp anymore as expected - the offset is known but not
solved.
$ ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
[...]
golf.zq1.de 192.53.103.103 2 u 51 64 1 13.436 5456358 5456358
And afterwards the service goes active (exited) as according to the -g doc the
daemon gives up without -g on too big time deltas.
That said I summarize - good to go on sponsoring trusty and with the
SRUs in that regard.
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https://bugs.launchpad.net/bugs/1593907
Title:
ntpdate startup routine prevents ntp service from launching up on
Ubuntu 16.04 server on system boot; manually starting ntp service
works: [FIX in DESCRIPTION], just need to apply it and release a new
version
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