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Pound Load Balancer. Naranchuluun . D. What Pound is. a reverse-proxy: it passes requests from client browsers to one or more back-end servers. a load balancer: it will distribute the requests from the client browsers among several back-end servers, while keeping session information.

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Pound load balancer

Pound Load Balancer

Naranchuluun. D


What pound is
What Pound is

  • a reverse-proxy: it passes requests from client browsers to one or more back-end servers.

  • a load balancer: it will distribute the requests from the client browsers among several back-end servers, while keeping session information.

  • an SSL wrapper: Pound will decrypt HTTPS requests from client browsers and pass them as plain HTTP to the back-end servers.

  • an HTTP/HTTPS sanitizer: Pound will verify requests for correctness and accept only well-formed ones.

  • 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.

  • a request redirector: requests may be distributed among servers according to the requested URL.


What pound is not
What Pound is Not

  • Pound is not a Web server: by itself, Pound serves no content - it contacts the back-end server(s) for that purpose.

  • Pound is not a Web accelerator: no caching is done - every request is passed "as is" to a back-end server.


Status
Status

Pound was successfully used in production with a variety of Web servers, including Apache, IIS, Zope, WebLogic, Jakarta/Tomcat, iPlanet, etc. In general Pound passes requests and responses back and forth unchanged, so we have no reason to think that any web server would be incompatible.


Client browsers that were tested
Client browsers that were tested

  • IE 5.0/5.5 (Windows) HTTP/HTTPS

  • Netscape 4.7 (Windows/Linux) HTTP/HTTPS

  • Mozilla (Windows/Linux) HTTP/HTTPS

  • Konqueror (Linux) HTTP/HTTPS

  • Galleon (Linux) HTTP/HTTPS

  • Opera (Linux/Windows) HTTP/HTTPS

  • Lynx (Linux) HTTP


Installation
Installation

  • Probably the easiest way to install Pound is to use a pre-compiled package if you can find one. While Apsis offers no such packages, they are available for quite a few systems (SuSE Linux, Debian and derivatives such as Ubuntu, as well as some private packages:

  • RPMs for RedHat are available at http://www.invoca.ch/pub/packages/pound/

  • A nice FreeBSD live-CD distribution is available at http://www.targeted.org/files/fbsd71_pound244.iso.gz, including a Pound binary.

  • Packages for CRUX Linux are available from http://ports.sterneck.asia/shin/#pound.

  • Example on Ubuntu Server Edition : apt-get install pound



Http

ListenHTTP

Address 0.0.0.0 # all interfaces Port 80HeadRemove"X-Forwarded-For"

Service

BackEnd

Address 10.0.0.1 Port 80 Priority 1

EndBackEnd

Address 10.0.0.2 Port 80 Priority 1

End

End

End


Https
Https

ListenHTTPS

Address 0.0.0.0 # all interfacesPort 443AddHeader"X-Forwarded-Proto: https“HeadRemove"X-Forwarded-Proto"HeadRemove "X-Forwarded-For"Cert "/path/to/certificate.pem

Service

BackEnd

Address 10.0.0.1 Port 80 Priority 1

EndBackEnd

Address 10.0.0.2 Port 80 Priority 1

End

End

End


More information
More Information

  • http://www.apsis.ch/pound

  • http://syslog.tv/2011/09/29/load-balancing-httphttps-with-pound-on-debian-6ubuntu/

  • http://blog.secaserver.com/2011/11/install-pound-web-load-balancer/



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