Work around the "Could not determine host ip address" error when you run

For some reasons, I got this error when running the script even though I have my local.conf file setup properly (I used the same local.conf for many times)

devstack$ ./
[Call Trace]
[ERROR] /opt/stack/devstack/stackrc:759 Could not determine host ip address. See local.conf for suggestions on setting HOST_IP.

One quick workaround is to set the HOST_IP default value in stackrc:

devtack $ nano stackrc

HOST_IP=${HOST_IP:-<my host ip address>}

Then will run smoothly :)