5 minute delay when provisioning over IPv6

[Derek Higgins]

The overcloud-full image attempts get a IPv4 address stalling the boot process for 5 minutes when non are available (e.g. if using IPv6), this stalls the boot process for 5 minutes until a timeout is hit

Mar 23 12:30:48 localhost.localdomain network[699]: Bringing up loopback interface: [ OK ]
Mar 23 12:30:48 localhost.localdomain network[699]: Bringing up interface eth0:
Mar 23 12:30:48 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6 (xid=0x5eff4a5b)
Mar 23 12:30:54 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x5eff4a5b)
Mar 23 12:31:02 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12 (xid=0x5eff4a5b)
Mar 23 12:31:14 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11 (xid=0x5eff4a5b)
Mar 23 12:31:25 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15 (xid=0x5eff4a5b)
Mar 23 12:31:41 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x5eff4a5b)
Mar 23 12:31:49 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9 (xid=0x5eff4a5b)
Mar 23 12:31:58 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19 (xid=0x5eff4a5b)
Mar 23 12:32:17 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18 (xid=0x5eff4a5b)
Mar 23 12:32:35 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 17 (xid=0x5eff4a5b)
Mar 23 12:32:52 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19 (xid=0x5eff4a5b)
Mar 23 12:33:11 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15 (xid=0x5eff4a5b)
Mar 23 12:33:26 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11 (xid=0x5eff4a5b)
Mar 23 12:33:37 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x5eff4a5b)
Mar 23 12:33:45 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13 (xid=0x5eff4a5b)
Mar 23 12:33:58 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19 (xid=0x5eff4a5b)
Mar 23 12:34:17 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18 (xid=0x5eff4a5b)
Mar 23 12:34:35 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10 (xid=0x5eff4a5b)
Mar 23 12:34:45 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10 (xid=0x5eff4a5b)
Mar 23 12:34:55 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 17 (xid=0x5eff4a5b)
Mar 23 12:35:12 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 21 (xid=0x5eff4a5b)
Mar 23 12:35:33 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13 (xid=0x5eff4a5b)
Mar 23 12:35:46 localhost.localdomain dhclient[868]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x5eff4a5b)
Mar 23 12:35:48 localhost.localdomain systemd[1]: network.service start operation timed out. Terminating.
Mar 23 12:35:48 localhost.localdomain systemd[1]: Failed to start LSB: Bring up/down networking.

the boot process then continues and can be reached over its SLAAC address

[Derek Higgins (derekh)]

The default dhclient timeout is 60, centos have changed it in the cloud image to 300 here
https://bugs.centos.org/view.php?id=6866

This was to deal with a amazon specific issue, I'd like to undo this in our images to atleast reduces the impact of this from 5 minutes to 1 minute (the dhclient default)

[Marios Andreou (marios-b)]

This is an automated action. Bug status has been set to 'Incomplete' and target milestone has been removed due to inactivity. If you disagree please re-set these values and reach out to us on freenode #tripleo