[Bug 1307429] Re: Existing allow-hotplug devices do not come up

[Benjamin Drung]

Update verified for Ubuntu 13.10:

# reboot
# apt-cache policy ifupdown
ifupdown:
  Installed: 0.7.44ubuntu3.1
  Candidate: 0.7.44ubuntu3.1
  Version table:
 *** 0.7.44ubuntu3.1 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     0.7.44ubuntu3 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

allow-hotplug eth1
iface eth1 inet dhcp

allow-hotplug eth2
iface eth2 inet dhcp

allow-hotplug eth3
iface eth3 inet dhcp

allow-hotplug eth4
iface eth4 inet dhcp

allow-hotplug eth5
iface eth5 inet dhcp
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 64000 qdisc pfifo_fast state UP qlen 1000
    link/ether 02:01:eb:44:b8:79 brd ff:ff:ff:ff:ff:ff
    inet 78.137.99.241/32 brd 78.137.99.241 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::1:ebff:fe44:b879/64 scope link 
       valid_lft forever preferred_lft forever

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https://bugs.launchpad.net/bugs/1307429

Title:
  Existing allow-hotplug devices do not come up

Status in “ifupdown” package in Ubuntu:
  Fix Released
Status in “ifupdown” source package in Precise:
  Fix Committed
Status in “ifupdown” source package in Saucy:
  Fix Committed
Status in “ifupdown” source package in Trusty:
  Fix Committed

Bug description:
  SRU Justification:
  [Impact]
  Devices that are listed with allow-hotplug in /etc/network/interfaces do not come up when they are hotplugged. "ip addr" shows that these devices are down.

  [Test Case]
  Steps to reproduce:

  1) Install Ubuntu 12.04, 13.10, or 14.04 in a virtual machine (e.g. with libvirt) with one network device.
  2) Modify /etc/network/interfaces to

  auto lo
  iface lo inet loopback
  allow-hotplug eth0
  iface eth0 inet dhcp
  allow-hotplug eth1
  iface eth1 inet dhcp
  allow-hotplug eth2
  iface eth2 inet dhcp

  3) Boot your virtual machine.
  4) Type "ip addr" to show your network devices. It should show eth0 which should be up (but isn't)
  5) Add/Hotplug one NIC to your virtual machine.
  6) "ip addr" should show that eth1 is up too (but isn't)

  [Regression Potential]
  Patch is already in Utopic.

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