Cluster wide reverse proxy for OpenStack

A nginx based reverse proxy configuration is installed on each bare metal node. It helps when the OpenStack cluster is made of nodes located on various hosting providers ( such as eNovance, Hetzner, etc. ). Each machine to which the IP for a given web site is routed is able to find the actual virtual machine supporting it. The configuration is pulled from the git repository by the puppet agent running on each node.
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