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From the Rackspace API guide:
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Public IP addresses can be shared across multiple servers for use in
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various high availability scenarios. When an IP address is shared to
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another server, the cloud network restrictions are modified to allow each
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server to listen to and respond on that IP address (you may optionally
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specify that the target server network configuration be modified). Shared
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IP addresses can be used with many standard heartbeat facilities (e.g.
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``keepalived``) that monitor for failure and manage IP failover.
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A shared IP group is a collection of servers that can share IPs with other
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members of the group. Any server in a group can share one or more public
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IPs with any other server in the group. With the exception of the first
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server in a shared IP group, servers must be launched into shared IP
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groups. A server may only be a member of one shared IP group.
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Use :meth:`Server.share_ip` and `Server.unshare_ip` to share and unshare
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.. currentmodule:: novaclient
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.. autoclass:: IPGroupManager
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:members: get, list, find, findall, create, delete
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.. autoclass:: IPGroup
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.. attribute:: servers
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A list of server IDs in this group.
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doc/source/ref/ipgroups.rst
