Bug#854475: postfix: systemd needs postfix at .service to have "After=network.target"

[Bernhard Schmidt]

Am 08.05.2017 um 05:59 schrieb Scott Kitterman:
> On Sunday, May 07, 2017 10:55:58 PM Bernhard Schmidt wrote:
>> On Sat, Apr 15, 2017 at 11:42:37PM +0200, Marcus Jodorf wrote:
>>
>> Hi,
>>
>> is there anything I can do to get this fixed for Stretch? I can
>> pretty reliably reproduce this issue with all my upgraded Stretch
>> systems, neither of them can send mails after a reboot until Postfix is
>> getting restarted
>>
>> An After=network.target should be pretty low-risk even this late in the
>> release cycle and should fix this issue.
>>
>> Best Regards,
>> Bernhard
> 
> postfix.service has After=network.target.  Why isn't that enough (I have not 
> had a lot of time to investigate this, but I have not given on up getting a 
> fix into stretch)?

AFAICT (Ccing systemd maintainers for input) postfix.service is mostly
used for compatibility with sysv (namely have "service postfix
something" do something reasonably by having the postfix at .service being
PartOf=postfix.service), but the actual decision what instance to start
is done by the generator
(/lib/systemd/system-generators/postfix-instance-generator) which
directly "wants" the instance.

IOW, I don't think postfix at .service being PartOf=postfix.service (which
does have After=network.target) influences its ordering.

The other quick fix for Stretch would be a "After=resolvconf.service", I
think most incarnations of this bug seen to far have been related to that.

Bernhard