The Pound program is a reverse proxy, load balancer and HTTPS front-end for Web servers. This Pound was developed to enable distributing the load among multiple Web servers and to allow for a convenient SSL wrapper for those Web servers which do not offer it natively. Pound is distributed under the GPL – no warranty, it’s free to use, copy and give away.
1) Reverse-proxy: it passes requests from client browsers to one or multiple back-end servers.
2) Load balancer: it will distribute the requests from the client browsers among several back-end servers, while keeping session information.
3) An SSL wrapper: Pound will decrypt HTTPS requests from client browsers and pass them as plain HTTP to the back-end servers.
4) An HTTP/HTTPS sanitizer: Pound will verify requests for correctness and accept only well-formed ones.
5) A fail over-server: should a back-end server fail, Pound will take note of the fact and stop passing requests to it until it recovers.
6) Request redirector: requests may be distributed among servers according to the requested URL.
Pound is a compatible program, which can be easily audited for security problems. It can run as setuid/setgid and/or in a chroot jail. Pound does not access the hard-disk at all (except for reading the certificate file on start, if required) and should thus pose no security threat to any machine.
Note:-
1) Pound is not a Web server: by itself, Pound serves no content – it contacts the back-end server(s) for that purpose.
2) Pound is not a Web accelerator: no caching is done – every request is passed “as is” to a back-end server.
