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 interfaces
Port 80
HeadRemove
"X
-
Forwarded
-
For"
Service
BackEnd
Address 10.0.0.1
Port 80
Priority 1
End
BackEnd
Address 10.0.0.2
Port 80
Priority 1
End
End
End
Https
ListenHTTPS
Address 0.0.0.0 # all interfaces
Port 443
AddHeader
"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
End
BackEnd
Address 10.0.0.2
Port 80
Priority 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/
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