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How to RE-configure base IP address of OpenStack host?

Note: Using OpenStack Juno as per RDO single-host installation quick start (packstack --allinone).

After having installed Juno from scratch (as per RDO quick start), everything works as expected. However the base IP address of the system (only a single NIC) is determined by DHCP. Since the original install, DHCP has now changed my base IP address, and as a result OpenStack no longer runs properly (all hard-coded configuration created by "packstack --allinone) is still based on the old IP).

How can I re-configure the existing installation to use the new IP address? (i.e. without having to do a full reinstallation from scratch)