I know it's a long time, but I'm cleaning up old NTP bugs atm.
This has multiple "fixes" and things to bementioned.
First of all it is interesting that iburst "fixes" this as it is documented as:
When the server is unreachable, send a burst of eight packets instead of the
usual one. The packet spacing is normally 2 s; however, the spacing
between the first and second packets can be changed with the calldelay
command to allow additional time for a modem or ISDN call to complete. This
option is valid with only the server command and is a recommended option with
this command.
While I don't see how this helps with the "problem" it is recommended so it
should be fine to add.
We already did add it in the past by one of the merges with Debian, so recent
releases already have the iburst as default.
Then to close one more extra info - ntp is meant to slowly drift times, as many
logics hat to be time warped.
That said the issue of one (and only one) huge initial time warp is a known
thing.
The solution to that is -g to ntpd which we use by default.
Documented as:
-g Normally, ntpd exits with a message to the system log if the
offset exceeds the panic threshold, which is 1000 s by default. This option
allows the time to be set to any value without restriction; however, this
can happen only once. If the threshold is exceeded after that, ntpd will exit
with a message to the system log. This option can be used with the -q and -x
options.
That means if your offset is what ntp considers huge (>1000 sec) it
warps time once, and if it is small it drifts towards it.
Also by default time is managed by systemd now, but still all old reported
issues were fixed, juts people forgot to update - setting fix released.
** Changed in: ntp (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/538840
Title:
ntpd default config misses "iburst" / takes minutes to synchronize
initially
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