My experience was that by default the packstack allinone installation script hard coded the ip address (it found at install time) in many configuration files in /etc. I didn't look further into whether the databases also contained such fixed addresses which weren't localhost. I dropped trying to packstack --allinone install on a dynamically addressed machine once I realized this.

My quick&dirty fix to get things running before I just re-installed from scratch was to assign that address statically to an unused ethernet port on the server with onboot=yes, when the original port had received a new one that didn't match the installation address.

I suppose one could create a "fake" network port with the installation ip as a static address as an alternative.