mod_proxy should add an extra HTTP header to the request called
"X-Forwarded-For" which you can parse to retrieve the IP address from.
Note, this can contain multiple IPs if there are several proxies on
route so make sure you parse it correctly.
Regards,
Mike
Travis Sidelinger wrote:
We have used both mod_rewrite and mod_proxy successfully in numerous
configurations. Put them together and they don't seem to like each other.
We have a working production mod_proxy_balancer configuration for two backend
web servers that is working great, except... The backend web servers need the
IP address of the clients to identify their location.
Yes, I had suggested just adding a location drop down so that users could select
their own location within the web application. Too inconvenient for the end
user they say.
They want "c_loc=xxx" added to the URL at the load balancer. Okay, this sounds
like a job for mod_rewrite. This should be easy enough using the QSA option.
But... mod_proxy works great, mod_rewrite works great, I put the to together and
they seem to not like each other.
Below is one of the many configurations tested. The best I can get is the URI
components are mixed up incorrectly. Any ideas?
My build of apache:
tar -xvzf httpd-2.2.8.tar.gz
cd httpd-2.2.8
CFLAGS="-O2" ./configure --enable-http --enable-info=shared \
--enable-ssl=shared --enable-rewrite=shared --enable-speling=shared \
--enable-cgi=shared --enable-deflate=shared --enable-disk-cache=shared \
--enable-cache=shared --enable-proxy=shared --enable-proxy-http=shared \
--enable-proxy-balancer=shared --prefix=/vol/devl/loadbalancer
make
make install
<VirtualHost catalog-devl.tld.org:81>
ServerName catalog-devl.tld.org
LogLevel debug
<Proxy *>
AddDefaultCharset off
Order Allow,Deny
Allow from all
</Proxy>
<Location /balancer-manager>
SetHandler balancer-manager
Order Allow,Deny
Allow from 192.168.200.0/24 192.168.222.0/24 192.168.223.0/24
192.168.220.13
</Location>
<Location />
Order Allow,Deny
Allow from 192.168.0.0/16 172.16.0.0/12
</Location>
# Add the client's location number to the URL
RewriteEngine On
# Large list of locations goes here. List removed to shorten for email
RewriteCond %{REMOTE_HOST} ^192\.168\.1\.[5-8]
RewriteRule /.*\.aspx?\? http://catalog-devl.tld.org%{REQUEST_URI}&c_loc=730
[L]
RewriteCond %{REMOTE_HOST} ^192\.168\.220\.
# Here are things I have tried
RewriteRule "^/(.*)$" proxy:balancer://aquabrowser$1&c_loc=220" [QSA,L] # I
get 404 Error: "GET //cd/README&c_loc=220%22?test=1 HTTP/1.1" in the logs of the
backend server.
RewriteRule "^(.*\?.*)$" "http://catalog1.tld.org%{REQUEST_URI}&c_loc=220";
[L,P] # I get 404 Error: "GET /cd/README&c_loc=220?test=1 HTTP/1.1" in the logs
of the backed server.
# This is a long list other things I have tried. Nothing seems to work.
ProxyRequests Off
ProxyVia On
ProxyPreserveHost On
ProxyPass /balancer-manager !
# Catalog Development
ProxyPass / balancer://aquabrowser/
<Proxy balancer://aquabrowser>
BalancerMember http://catalogdev.tld.org:80 min=1 smax=20 loadfactor=5
#BalancerMember http://catalog1.tld.org:80 min=1 smax=20 loadfactor=5
route=CAT1
#BalancerMember http://catalog2.tld.org:80 min=1 smax=20 loadfactor=5
route=CAT2
ProxySet lbmethod=byrequests
ProxySet stickysession=ABbalancer
ProxySet nofailover=Off
ProxySet maxattempts=3
ProxySet timeout=5
Order Allow,Deny
Allow from 192.168.0.0/16 172.16.0.0/12
</Proxy>
ProxyPassReverse / http://catalogdev.tld.org
#ProxyPassReverse / http://catalog1.tld.org
#ProxyPassReverse / http://catalog2.tld.org
</VirtualHost>
Travis Sidelinger
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