canonical-ubuntu-qa team mailing list archive

[Iain Lane <2019195@xxxxxxxxxxxxxxxxxx>]

Fully qualified domain names do have a trailing dot, so this is a legal
domain name. Question is whether postfix likes it like that, and it
seems like not.

I think this setting comes from postfix.postinst. There's some code in
there (myfqdn()) which finds out the fqdn of the host. There's a bit of
code to look up the domain name from search paths in /etc/resolv.conf.
That will strip off a trailing dot if it is there.

Since we still see a trailing dot I think that means that the hostname
in /etc/hostname must itself have the trailing dot in it. As far as I
can tell that is perfectly fine, if uncommon.

If that's all right (a big assumption) then I would suggest the fix is
in postfix.postinst to always strip a trailing dot if it finds one,
thereby making myhostname into something which postfix likes the look
of.

Do let me know if I misunderstood any of this :-)

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https://bugs.launchpad.net/bugs/2019195

Title:
  Domain name for autopkgtests ending with dot ('.')

Status in Auto Package Testing:
  New

Bug description:
  I have been looking at
  https://autopkgtest.ubuntu.com/results/autopkgtest-mantic/mantic/amd64/f/fwlogwatch/20230502_145023_da50b@/log.gz
  where the installation of postfix fails in the autopkgtest environment.

  The hostname passed to the test is "adt-mantic-
  amd64-fwlogwatch-20230502-143927-lrg-root5".

  After concatenating with the domain in postfix function
  check_myhostname() the hostname becomes "adt-mantic-
  amd64-fwlogwatch-20230502-143927-lrg-root5.openstack.prodstack5.lan."
  which terminates with a dot. Later function valid_hostname() detects
  that this is invalid.

  As the problem does not occur in a local autopkgtest I assume this is
  due to some issue with the openstack configuration.

  Best regards

  Heinrich

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