You can associate or change a floating IP address of a virtual machine any time after virtual machine creation. Although, Mirantis OpenStack automatically assigns a private IP address to a VM at the moment of creation, you may want to assign a floating IP address, so that the VM can communicate with external networks.
To allocate a floating IP address with a virtual machine:
Log in to Horizon.
Click Project ‣ Compute ‣ Instances.
Click the arrow in the Actions column.
Select Associate Floating IP.
The Manage Floating IP Associations wizard starts.
In the IP Address field, click +.
Click Allocate IP.
Click Associate.
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