Steps to follow :

  • Create a IP pool first.

    nova-manage floating create --pool POOL_NAME --ip_range
    
  • Now go to openstack horizon and do the following:

    • Go to Access & Security -> Floating IPs -> Allocate IP to Project

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    • Now select the pool you created and allocate the IP.

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    • Now go the the IP and associate it with the Instance you wanted.

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Abhishek Shrivastava