Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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  systemd-nspawn container networking lost after systemd-container

Status in systemd package in Ubuntu:

Bug description:
  I have 2 systemd-nspawn containers running on an ubuntu 18.04 server used for 
an internal test automation service.
  They each use a private network using the nethork-veth option and expose a 
single port.
  The host system runs nginx and routes traffic to the two containers.

  After running apt upgrade the container ports were no longer reachable
  from the outside causing the server to repond with HTTP 502 bad
  gateway on the host.

  To resolve the situation I had to restart the two containers running:
  - machinectl stop helvetest-prod
  - machinectl start helvetest-prod
  - machinestl stop helvetest-dev
  - machinectl start helvetest-dev

  Everything was fine after that.

  The two containers are run as instances of the built-in systemd-nspawn@ 
  I use the following nspawn configuration:

  root@helvetest:/etc/systemd/nspawn# ls -lrth
  total 8.0K
  -rw-r--r-- 1 root root 92 Apr 11 07:09 helvetest-dev.nspawn
  -rw-r--r-- 1 root root 92 Apr 12 11:34 helvetest-prod.nspawn

  root@helvetest:/etc/systemd/nspawn# cat helvetest-prod.nspawn 


  root@helvetest:/etc/systemd/nspawn# cat helvetest-dev.nspawn 


  Host details

  # lsb_release -rd
  Description:  Ubuntu Bionic Beaver (development branch)
  Release:      18.04

  Partial apt upgrade logs

  Preparing to unpack .../libnss-systemd_237-3ubuntu8_amd64.deb ...
  Unpacking libnss-systemd:amd64 (237-3ubuntu8) over (237-3ubuntu7) ...
  Preparing to unpack .../libnss-mymachines_237-3ubuntu8_amd64.deb ...
  Unpacking libnss-mymachines:amd64 (237-3ubuntu8) over (237-3ubuntu7) ...
  Preparing to unpack .../systemd-container_237-3ubuntu8_amd64.deb ...
  Unpacking systemd-container (237-3ubuntu8) over (237-3ubuntu7) ...
  Preparing to unpack .../libsystemd0_237-3ubuntu8_amd64.deb ...
  Unpacking libsystemd0:amd64 (237-3ubuntu8) over (237-3ubuntu7) ...
  Setting up libsystemd0:amd64 (237-3ubuntu8) ...

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd-container 237-3ubuntu8
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  Date: Mon Apr 16 08:53:20 2018
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)

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