The issue was that the old method simply didn't work. When the hosts
file should look like:
127.0.1.1 host.fqdn.com host
It looked like:
127.0.1.1 host.fqdn.com host old.fqdn.com old
Or this if the user didn't set a fqdn
127.0.1.1 host host old.fqdn.com old
This patch fixes that.
On Debian and Ubuntu guests, when the new hostname of the guest box is
set, the DHCP client (isc-dhcp-client) won't renew its DHCP lease with
the new hostname. Executing "ifdown -a; ifup -a" to reinitialize all auto
interfaces fixes this issue.
Furthermore, as vagrant will now actually wait until a DHCP lease is
acquired, it is guaranteed that the the correct domainname is set from
DHCP before calling other provisioners like puppet, that rely on it.
This fixes puppet/facter sometimes failing to find the fqdn fact on an
LXC guest when the DHCP server is responding too slow.
Nathan Mische
Teemu Matilainen
Laurent Raufaste
Elliot Segler
Alan Braithwaite
Mitchell Hashimoto
Franz Pletz
Tore Darell