[Bug 1649453] Re: systemd starts postfix before resolver

[Scott Thatcher]

And I note I didn't do a very good job of adding those X's. Oh well.

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Title:
  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Scott Thatcher]

Sorry to jump on this six-month-old bug, but it seems to be describing
exactly what's still going wrong for me. When I reboot my system running
Postfix, no mail is sent, and I get the following output when I run
"mailq":

-Queue ID-  --Size-- Arrival Time -Sender/Recipient---
47F291B6B   511 Mon Jun 26 10:53:26  thatcher@
(Host or domain name not found. Name service error for name=mail.X 
type=MX: Host not found, try again)
 thatc...@truman.edu

-- 0 Kbytes in 1 Request.

I put the X's in for privacy, although I don't know that it matters if
you need to see the addresses. All runs normally if I restart Postfix
after the system has finished booting.

Here is the result from the same command run by the original submitter
of this bug:

postfix.service +11ms
└─network-online.target @28.091s
  └─NetworkManager-wait-online.service @19.357s +8.733s
└─NetworkManager.service @17.565s +1.791s
  └─dbus.service @14.834s
└─basic.target @14.725s
  └─sockets.target @14.725s
└─snapd.socket @14.687s +37ms
  └─sysinit.target @14.686s
└─apparmor.service @13.847s +839ms
  └─local-fs.target @13.846s
└─run-user-121.mount @23.286s
  └─local-fs-pre.target @4.172s
└─systemd-remount-fs.service @4.119s +36ms
  └─system.slice @1.804s
└─-.slice @1.610s
systemd-resolved.service +680ms
└─network.target @20.229s
  └─wpa_supplicant.service @32.364s +374ms
└─basic.target @14.725s
  └─sockets.target @14.725s
└─snapd.socket @14.687s +37ms
  └─sysinit.target @14.686s
└─apparmor.service @13.847s +839ms
  └─local-fs.target @13.846s
└─run-user-121.mount @23.286s
  └─local-fs-pre.target @4.172s
└─systemd-remount-fs.service @4.119s +36ms
  └─system.slice @1.804s
└─-.slice @1.610s

I don't really understand everything about this output, but it looks
like Postfix is still starting before systemd-resolved.service.

This problem first showed up in Yackety, and I've been keeping on top of
updates since that point. It was certainly not resolved after January.
I've now updated to Zesty using the upgrade tool (not a fresh install),
where the behavior persists.

I did try purging and reinstalling Postscript, but that didn't help. I'm
happy to provide any other diagnostic information you might like, and
thanks for your work on this.

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Title:
  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Launchpad Bug Tracker]

This bug was fixed in the package postfix - 3.1.4-2

---
postfix (3.1.4-2) unstable; urgency=medium

  * Update postfix Suggestions.
  * Update postfix-sqlite postinst/prerm to reflect that addmap is idempotent.
  * Restore so.1.0.1 symlinks for map libraries and change how new entries are
added.  Closes: #850400
  * Be more aggressive in retiring usage of lmtp binary.  Closes: #850430
LP: #1654453
  * Check symlinks separately in postfix-script, to allow library symlinks. 
This will go away once the symlinks are dropped again.

 -- LaMont Jones   Fri, 06 Jan 2017 08:41:36 -0700

** Changed in: postfix (Ubuntu)
   Status: Fix Committed => Fix Released

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  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

Now that the upload I had pending is done, I did look into this a bit
further.

By adding the After=network-online.target override, when I look at the
output of systemd-analyze critical-chain with and without an equivalent
Wants= postfix is starting after network-online.target.

I didn't look explicitly at the different with/without for systemd-
resolved (since it's not active on my test system), but I don't see what
difference it makes.

I'm inclined to leave it as is pending some explanation of what
practical difference adding the Wants= would have.

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  systemd starts postfix before resolver

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Re: [Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

On Wednesday, January 04, 2017 07:28:27 AM you wrote:
> Thanks. OOI, does it really hurt to have the After=systemd-
> resolved.service even for cases where it's not strictly needed?

Probably not.  We've got a huge stack of changes queued, of which this is a 
small part.  I'll look at this for the next upload, but I don't want to delay 
the current one for further tweaking.

Scott K

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[Bug 1649453] Re: systemd starts postfix before resolver

[Martin Pitt]

Thanks. OOI, does it really hurt to have the After=systemd-
resolved.service even for cases where it's not strictly needed?

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Re: [Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

On Tuesday, January 03, 2017 08:43:15 PM you wrote:
> @Scott:
> https://git.launchpad.net/postfix/commit/?h=stable/v3.1=1a190cf17cc02
> looks rather complicated and also creates an unmanaged config file. Why
> not just always add those After= to the .service? If resolved is not
> enabled, then After=systemd-resolved is a no-op (it's only ordering, not
> a dependency -- that would be Requires= or Wants=).
> 
> Also, not sure why you added network-online.target, but if you actually
> do want to wait for the network then you also need a corresponding Wants
> =network-online.target (see man systemd.special).

Thanks. It depends on how postfix is configured (via Debconf) if these are 
needed or not.  I think ordering is all we need since, in some cases we've 
seen issues with the current service file.  In some configurations neither 
network-online.targe nor systemd-resolved are needed.

I did, in a later commit, remove the config file on purge, so that's
fixed.

Scott K

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Title:
  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Martin Pitt]

@Scott:
https://git.launchpad.net/postfix/commit/?h=stable/v3.1=1a190cf17cc02
looks rather complicated and also creates an unmanaged config file. Why
not just always add those After= to the .service? If resolved is not
enabled, then After=systemd-resolved is a no-op (it's only ordering, not
a dependency -- that would be Requires= or Wants=).

Also, not sure why you added network-online.target, but if you actually
do want to wait for the network then you also need a corresponding Wants
=network-online.target (see man systemd.special).

** No longer affects: systemd (Ubuntu)

** Tags added: resolved

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  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Greg Black]

OK. Thanks for the update.

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Re: [Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

On Tuesday, January 03, 2017 12:34:12 AM you wrote:
> Any idea when the fix will appear in updates for yakkety?

We plan on an upload to Debian in the next day or two.  It'll follow into 
Ubuntu shortly there after.  A Yakkety SRU is work for someone involved in 
Ubuntu to do, so no.

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[Bug 1649453] Re: systemd starts postfix before resolver

[Greg Black]

Any idea when the fix will appear in updates for yakkety?

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  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

** Changed in: postfix (Ubuntu)
   Status: Triaged => Fix Committed

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  systemd starts postfix before resolver

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[Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

** Changed in: postfix (Ubuntu)
   Importance: Undecided => High

** Changed in: postfix (Ubuntu)
 Assignee: (unassigned) => Scott Kitterman (kitterman)

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Re: [Bug 1649453] Re: systemd starts postfix before resolver

[Scott Kitterman]

On Tuesday, December 20, 2016 12:21:51 AM you wrote:
> This is probably also an issue on Debian, would you be willing to file a
> bug there? Against postfix specifically.

There's no need.  I'm already looking at it.

Scott K

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[Bug 1649453] Re: systemd starts postfix before resolver

[Nish Aravamudan]

This is probably also an issue on Debian, would you be willing to file a
bug there? Against postfix specifically.

** Changed in: postfix (Ubuntu)
   Status: New => Triaged

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[Bug 1649453] Re: systemd starts postfix before resolver

[Greg Black]

** Also affects: postfix (Ubuntu)
   Importance: Undecided
   Status: New

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