Public bug reported:
Postfix starts before systemd-resolved.service, resulting in postfix
reporting that it can't find MX records for outgoing mail, as shown in
the trace below:
$ systemd-analyze critical-chain postfix.service systemd-resolved.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.
postfix.service +1ms
└─network.target @5.811s
└─NetworkManager.service @5.690s +91ms
└─dbus.service @5.627s
└─basic.target @5.597s
└─sockets.target @5.597s
└─snapd.socket @5.597s +269us
└─sysinit.target @5.596s
└─systemd-timesyncd.service @5.420s +175ms
└─systemd-tmpfiles-setup.service @5.408s +8ms
└─local-fs.target @5.390s
└─zfs-mount.service @3.879s +1.511s
└─zfs-import-cache.service @2.539s +1.303s
└─systemd-udev-settle.service @256ms +2.252s
└─systemd-udev-trigger.service @208ms +47ms
└─systemd-udevd-control.socket @148ms
└─-.mount @122ms
└─system.slice @124ms
└─-.slice @122ms
systemd-resolved.service +268ms
└─network.target @5.811s
└─NetworkManager.service @5.690s +91ms
└─dbus.service @5.627s
└─basic.target @5.597s
└─sockets.target @5.597s
└─snapd.socket @5.597s +269us
└─sysinit.target @5.596s
└─systemd-timesyncd.service @5.420s +175ms
└─systemd-tmpfiles-setup.service @5.408s +8ms
└─local-fs.target @5.390s
└─zfs-mount.service @3.879s +1.511s
└─zfs-import-cache.service @2.539s +1.303s
└─systemd-udev-settle.service @256ms +2.252s
└─systemd-udev-trigger.service @208ms +47ms
└─systemd-udevd-control.socket @148ms
└─-.mount @122ms
└─system.slice @124ms
└─-.slice @122ms
The postfix service needs to start after systemd-resolved.service.
$ lsb_release -rd
Description: Ubuntu 16.10
Release: 16.10
$ apt-cache policy systemd
systemd:
Installed: 231-9ubuntu1
Candidate: 231-9ubuntu1
Version table:
*** 231-9ubuntu1 500
500 http://mirror.aarnet.edu.au/pub/ubuntu/archive yakkety-updates/main
amd64 Packages
100 /var/lib/dpkg/status
231-9git1 500
500 http://mirror.aarnet.edu.au/pub/ubuntu/archive yakkety/main amd64
Packages
$ apt-cache policy postfix
postfix:
Installed: 3.1.0-5
Candidate: 3.1.0-5
Version table:
*** 3.1.0-5 500
500 http://mirror.aarnet.edu.au/pub/ubuntu/archive yakkety/main amd64
Packages
100 /var/lib/dpkg/status
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1649453
Title:
systemd starts postfix before resolver
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