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added a comment about balancing and documented the 

new proxy.balance option


git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.3.x@385 152afb58-edef-0310-8abb-c4023f1b3aa9
This commit is contained in:
Jan Kneschke 2005-06-15 09:27:56 +00:00
parent 01afa1ca5b
commit b54ea0c621
1 changed files with 49 additions and 17 deletions
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66
doc/proxy.txt
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@ -35,6 +35,16 @@ lighttpd provides the Proxy support via the proxy-module
Proxy module. Currently only 0 and 1 are used. Use 1 to
enable some debug output, 0 to disable it.
:proxy.balance:
might be one of 'hash', 'round-robin' or 'fair' (default).
'round-robin' choses another host for each request, 'hash'
is generating a hash over the request-uri and makes sure
that the same request URI is sent to always the same host.
That can increase the performance of the backend servers
a lot due to higher cache-locality. 'fair' is the normal
load-based, passive balancing.
:proxy.server:
tell the module where to send Proxy requests to. Every
file-extension can have its own handler. Load-Balancing is
@ -43,30 +53,52 @@ lighttpd provides the Proxy support via the proxy-module
structure of proxy.server section: ::
( <extension> =>
( <handle> =>
(
( "host" => <string> ,
"port" => <integer>
)
),
( <handle> => ...
)
"port" => <integer> ),
( "host" => <string> ,
"port" => <integer> )
),
<extension> => ...
)
:<extension>: is the file-extension or prefix
(if started with "/")
:<handle>: is just a unique handle name
:<extension>: is the file-extension or prefix (if started with "/")
might empty to match all requests
:"host": is ip of the proxy server
:"port": is tcp-port on the "host" used by the proxy
server
server (default: 80)
e.g.: ::
proxy.server = ( ".php" =>
( "grisu" =>
(
"host" => "192.168.0.2",
"port" => 1026
)
)
proxy.server = ( ".jsp" =>
( (
"host" => "10.0.0.242",
"port" => 81
) )
)
Example:
========
Using lighttpd + mod_proxy in front of 8 Squids which handle the
caching of dynamic content for you. All requests for the host
www.example.org should be forwarded to the proxy. All proxies
listen on port 80 for requests. ::
$HTTP["host"] == "www.example.org" {
proxy.balance = "hash"
proxy.balance = ( "" => ( ( "host" => "10.0.0.10" ),
( "host" => "10.0.0.11" ),
( "host" => "10.0.0.12" ),
( "host" => "10.0.0.13" ),
( "host" => "10.0.0.14" ),
( "host" => "10.0.0.15" ),
( "host" => "10.0.0.16" ),
( "host" => "10.0.0.17" ) ) )
}
If one of the hosts goes down the all requests for this one server are
moved equally to the other servers. If you want to know more about
the algorithm used here google for 'Microsoft CARP'.