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Regresion from Bug #1657940.
When provisioning with multiple eth0 addresses, /etc/resolv.conf is
empty:
Consider:
root@tester:~# cat /etc/network/interfaces.d/50-cloud-init.cfg
# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 138.197.98.102
dns-nameservers 8.8.8.8 8.8.4.4
gateway 138.197.96.1
netmask 255.255.240.0
# control-alias eth0
iface eth0 inet static
address 10.17.0.11
netmask 255.255.0.0
Which then yields an empty /etc/resolv.conf:
root@tester:/run/resolvconf# cat interface/eth0.inet
root@tester:/run/resolvconf# cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
The problem is that resolvconfg does pattern matching for eth*.inet. The
second definition of eth0 has no nameserver and therefore overrides the
definition.
** Affects: cloud-init (Ubuntu)
Importance: Medium
Status: Confirmed
--
0.7.9-48-g1c795b9-0ubuntu1~16.04.1 with multiple eth0 definitions has no
resolvers
https://bugs.launchpad.net/bugs/1675571
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