Pound load balancer
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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

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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.

  • 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

  • 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

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

  • 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

  • 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


Configration


Http

ListenHTTP

Address 0.0.0.0 # all interfacesPort 80HeadRemove"X-Forwarded-For"

Service

BackEnd

Address 10.0.0.1Port 80Priority 1

EndBackEnd

Address 10.0.0.2Port 80Priority 1

End

End

End


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 10.0.0.1Port 80Priority 1

EndBackEnd

Address 10.0.0.2Port 80Priority 1

End

End

End


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/


Thank you for your attention

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