nova-network: br100 is assigned two IPs, original is lost.

[Adam Gandelman]

Using FlatDHCPManager on a single NIC, single network setup, I've been using eth0 (which already has IP 10.55.55.3) as the bridge_interface for br100. To avoid conflicts, I manually reserve fixed_ips for hosts. (10.55.55.0-10.55.55.18 end up as reserved in fixed_ips). Using nova-network 2011.3~rc~20110909.r1155-0ubuntu1 , all works well. br100 is created, inherits the IP of eth0 and serves DHCP with unreserve and non-conflicting addresses. This is a testing environment.

Using milestone-proposed / 2012.1~e1~20110921.1611-0ubuntu0ppa1~oneiric1, the bridge seems to first inheirt the original IP of the interface but then is assigned another IP, which I assume is coming from the unrresrved pool of fixed_ips.

corresponding parts of nova-network.log attached.

[Vish Ishaya (vishvananda)]

Thiis is expected behavior. In HA mode each host needs to be assigned an ip to gateway for its vms. If you want to manually reserve an ip for a host, it is insufficient to simply set it to reserved. You will need to manually associate it with the host by setting the host field in the fixed_ips table.

Something like:

mysql -h $MYSQL_HOST -u $MYSQL_USER -p $MYSQL_PASS $MYSQL_DB -e "UPDATE fixed_ips SET host=`hostname` WHERE address='$MY_IP'"

should be sufficient.