This seems to be somewhat related to https://bugs.launchpad.net/cpc- gce/+bug/1639089 (only affects Xenial).
In summary the "pool" entries in ntp.conf should be commented out by gce-cloud-config but when ntp.conf transitioned from using "server" to "pool" gce-cloud-config was not updated. I will be fixing lp:1639089 in the GCE Xenial image build process initially followed by a fix for gce-cloud-config. Note that gce-cloud-config is being deprecated in favour of gce-compute- image-packages which does not have this bug. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ntp in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-images/+bug/1652695/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
