A public IP address is assigned to every instance that is started in Openstack. This IP address assigned to your instance stays with your instance forever until the instance is deleted from the cloud. None of these actions will release the IP address from the instance: soft/hard reboot, halt, shutdown, suspend, shelve, pause, lock/unlock. The only thing that will remove the IP address from the instance and from your project usage is if you delete the instance.
This differs from our previous cloud environment where Eucalyptus required the assigning of elastic IPs if you wanted to ensure your instance kept the same IP address. This no longer necessary.
Project (group) quotas: Each project is assigned a quota for managing storage and compute usage as well as IP addresses. At this time, each project is allocated with 2 IP addresses. If you require more than 2, consider using a self-service (private) network. If this does not work for your project please email ccr-help. Additional costs may be associated with IP allocations over 2.
REMEMBER: The IP address assigned from the public LakeEffect network (199.109.195.x) has access to the outside world. Which means the outside world has access to your instance. Make sure you secure your instances with security groups
Adding Additional Interfaces to an Instance
It is possible to allocate more than one IP address with an instance. Please see attaching additional network interfaces to instance for more details
See this documentation for information: https://docs.openstack.org/mitaka/install-guide-ubuntu/launch-instance-networks-selfservice.html
YouTube video on creating a private network: https://www.youtube.com/watch?v=cIdCjNSZNrg