[Bug 1556241] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From thorsten.diehl at de.ibm.com 2016-03-22 12:48 EDT-------
OK, I found the cause. :-)

/lib/systemd/system/ubuntu-snappy.firstboot.service writes the file /etc/network/interfaces.d/encf5f0 on first reboot - and write the dhcp statement also. See the attached strace log, line 274-283:
openat(AT_FDCWD, "/etc/network/interfaces.d", O_RDONLY|O_CLOEXEC) = 5
openat(AT_FDCWD, "/etc/network/interfaces.d/encf5f0.M1yTYCQL5bt5", O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_CLOEXEC, 0644) = 6
write(6, "allow-hotplug encf5f0\niface encf5f0 inet dhcp\n", 46) = 46
fsync(6)                                = 0
futex(0x2aa3b1d73b0, FUTEX_WAKE, 1)     = 1
renameat(AT_FDCWD, "/etc/network/interfaces.d/encf5f0.M1yTYCQL5bt5", AT_FDCWD, "/etc/network/interfaces.d/encf5f0") = 0
fsync(5)                                = 0
futex(0x2aa3b1d73b0, FUTEX_WAKE, 1)     = 1
close(6)                                = 0
close(5)

ubuntu-snappy.firstboot.service must consider a static configuration of
an interface, but it does not. Please fix this, if possible for the
upcoming Beta version!

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https://bugs.launchpad.net/bugs/1556241

Title:
  installer sets "iface encf5f0 inet dhcp" although a static IP address
  was preseeded

Status in debian-installer package in Ubuntu:
  Confirmed

Bug description:
  == Comment: #0 - Thorsten Diehl - 2016-03-11 12:49:44 ==
  I installed xenial with installer version 432 and a preseed file that has a IPv4 static configuration. Upon the initial boot after installation, everything is fine, system comes up with network. When I perform a reboot, the network service waits for "something" and prints continuously messages aka "A start job is running for Raise network interfaces (3min 14s / 5min)". After that, the network is up.
  I found, that it was waiting for DHCP responses. (attaching /var/log/syslog).
  /etc/network/interfaces looks like this:
  # This file describes the network interfaces available on your system
  # and how to activate them. For more information, see interfaces(5).

  source /etc/network/interfaces.d/*

  # The loopback network interface
  auto lo
  iface lo inet loopback

  # The primary network interface
  auto encf5f0
  iface encf5f0 inet static
  	address 9.152.162.158
  	netmask 255.255.252.0
  	network 9.152.160.0
  	broadcast 9.152.163.255
  	gateway 9.152.160.1
  	# dns-* options are implemented by the resolvconf package, if installed
  	dns-nameservers 9.152.120.241
  	dns-search boeblingen.de.ibm.com
  /etc/network/interfaces.d/encf5f0 looks like this:
  allow-hotplug encf5f0
  iface encf5f0 inet dhcp
  which seems to be the cause. After removing the second line, it worked as expected.

  Not sure, whether this is the best approach. I just wanted to point to
  the root cause. But starting a dhcp client when you have a static IP
  address configured is definitely wrong.

  == Comment: #2 - Thorsten Diehl <thorsten.diehl at de.ibm.com> - 2016-03-11 12:55:54 ==
  uname -r
  4.4.0-12-generic

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