> However, we may want to consider changing the default ntp
configuration to use 'server' rather than 'pool' for ntp.ubuntu.com, to
ensure that it is included in the configuration at least once.
Why is this necessary? AIUI, ntp.ubuntu.com exists as a backup in case
pool.ntp.org (an externally managed domain) fails to resolve or is
otherwise down. Will this not work right now? If it does not, that's
really a separate bug (that we should fix).
** Changed in: ntp (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1652695
Title:
GCE default NTP configuration uses both leap-smeared and true UTC
sources
Status in cloud-images:
New
Status in ntp package in Ubuntu:
Incomplete
Bug description:
A default install of cloud images on GCE results in a configuration of
NTP which will likely be problematic during leap seconds, because it
uses both Google's leap-smeared time source, and the public pool,
which uses true UTC. These should not be combined in the default
configuration.
The principle of least astonishment would suggest that a non-standard
feature like leap smearing should be disabled by default.
This behaviour has been consistent in the 3 different GCE regions in
which I've recently created instances.
root@instance-4:~# cat /etc/cloud/build.info
build_name: server
serial: 20161221
root@instance-4:~# cat /etc/ntp.conf
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
driftfile /var/lib/ntp/ntp.drift
# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
# Specify one or more NTP #servers.
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
pool 0.ubuntu.pool.ntp.org iburst
pool 1.ubuntu.pool.ntp.org iburst
pool 2.ubuntu.pool.ntp.org iburst
pool 3.ubuntu.pool.ntp.org iburst
# Use Ubuntu's ntp #server as a fallback.
pool ntp.ubuntu.com
# ... comments snipped ...
# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
# Local users may interrogate the ntp #server more closely.
restrict 127.0.0.1
restrict ::1
# Needed for adding pool entries
restrict source notrap nomodify noquery
# ... comments snipped ...
# Google NTP source. This was added as part of the gce-cloud-config package.
server metadata.google.internal
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