For an AIO installation I cannot reproduce this issue, so please give us more information about your setup: How many nodes are you using and with which roles? What does the local.conf for the controller look like? Also please show the output of "sudo systemctl status devstack@n-api" and "sudo journalctl -u devstack@n-api".
For an AIO installation I cannot reproduce this issue, so please give us more information about your setup: How many nodes are you using and with which roles? What does the local.conf for the controller look like? Also please show the output of "sudo systemctl status devstack@n-api" and "sudo journalctl -u devstack@n-api".