• https://www.mirantis.com/blog/configuring-floating-ip-addresses-networking-openstack-public-private-clouds/

• http://docs.openstack.org/user-guide/content/cli_configure_instances.html

It is also possible to add and remove security groups when an instance is running. Currently this is only available through the command-line tools. Here is an example:

$ nova add-secgroup <server> <securitygroup>

$ nova remove-secgroup <server> <securitygroup>