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OpenStack Cloud Computing Cookbook by Kevin Jackson

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Automatically assigning floating IPs

When an instance boots, it is assigned a private IP address. This private IP address is only accessible within our virtual environment's network. To access this instance to serve the rest of the network or the public, we need to assign it a floating IP, which is the range we configure when we set up public IP ranges.

Automatically assigning floating IPs to instances gives us the ability, in our environment, to have access to all instances on our network. Although there are times when we might want to manually assign addresses (for example, where we have a limited number of IPs assigned to a tenancy), the convenience of having this done for you is very beneficial and makes our OpenStack environment operate much ...

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