cloud-init-nonet hangs when loopback alias exists

[Matthew Buckett]

Upon creating a automatic loopback interface alias cloud-init-nonet will hang for 120 seconds every time the machine boots.

cat > /etc/network/interfaces.d/lo0.cfg <<EOF
auto lo:0
iface lo:0 inet static
  address 127.0.0.2
EOF

Description: Ubuntu 14.04 LTS
Release: 14.04

[Matthew Buckett (buckett)]

I worked around this by editing /etc/network/if-up.d/upstart and excluding the loopback interfaces aliases from the auto interfaces, the change was:

        found=$(ifquery --list --allow auto 2>/dev/null) || return

to:

        found=$(ifquery --list --allow auto --exclude lo:\* 2>/dev/null) || return

Then it doesn't wait for the loopback aliases and everything starts up fast.