[Bug 1792906] [NEW] resolv.conf written after network-online.target

[Gerben]

Public bug reported:

On the server the docker.service is run.

Sometimes after reboots it hands down a default resolv.conf to docker
domains (8.8.8.8 and 8.8.4.4 if I'm correct) and NOT our local
resolv.conf (which is generated from /etc/network/interfaces).

It looks like a race condition between the docker service and the status
of the hosts /etc/resolv.conf (which is a link to
/run/resolvconf/resolv.conf) since other times thing work out OK.

network-online.target should only be met after
/run/resolvconf/resolv.conf is complete in my opinion.

docker-ce service definition is: 
(/lib/systemd/system/docker.service)
Wants=network-online.target

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: systemd 237-3ubuntu10.3
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
Date: Mon Sep 17 12:00:39 2018
InstallationDate: Installed on 2018-05-09 (130 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Lsusb:
 Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-34-generic root=/dev/mapper/hostname--vg-root ro
SourcePackage: systemd
UpgradeStatus: Upgraded to bionic on 2018-05-09 (130 days ago)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-xenial
dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-xenial
dmi.sys.vendor: QEMU

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1792906

Title:
  resolv.conf written after network-online.target

Status in systemd package in Ubuntu:
  New

Bug description:
  On the server the docker.service is run.

  Sometimes after reboots it hands down a default resolv.conf to docker
  domains (8.8.8.8 and 8.8.4.4 if I'm correct) and NOT our local
  resolv.conf (which is generated from /etc/network/interfaces).

  It looks like a race condition between the docker service and the
  status of the hosts /etc/resolv.conf (which is a link to
  /run/resolvconf/resolv.conf) since other times thing work out OK.

  network-online.target should only be met after
  /run/resolvconf/resolv.conf is complete in my opinion.

  docker-ce service definition is: 
  (/lib/systemd/system/docker.service)
  Wants=network-online.target

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.3
  ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
  Uname: Linux 4.15.0-34-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.3
  Architecture: amd64
  Date: Mon Sep 17 12:00:39 2018
  InstallationDate: Installed on 2018-05-09 (130 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-34-generic root=/dev/mapper/hostname--vg-root ro
  SourcePackage: systemd
  UpgradeStatus: Upgraded to bionic on 2018-05-09 (130 days ago)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-xenial
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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