Let us take following scenario
Server A -------------------------------Server B
with Public IP On LAN
both A and B are on same subnet
an application on B is accessible when you are having
a GUI on B and that too
only as http://localhost:9090/portal
the configuration is
ProxyPass / http://localhost:9090/portal
ProxyPassReverse / http://localhost:9090/portal
Now I have server A which has public IP and following websites are
Reverse Proxied from A
http://site1.exampleserver.com
http://site2.exampleserver.com
http://site3.exampleserver.com
http://site4.exampleserver.com
None of the website is on A they are on different IPs internally.
Each of these site1 to site 4 is made accessible via reverse proxy at A.
i.e.
a request to site2.exampleserver.com is served by an apache vhost as follows
<VirtualHost *:80>
ServerAdmin webmaster@(protected)
ServerName site2.exampleserver.com
ProxyRequests off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPreserveHost Off
ProxyPass / http://site2.exampleserver.com
ProxyPassReverse / http://site2.exampleserver.com
</VirtualHost>
Note in above configuration which is vhost for site2 at A,
DocumentRoot is missing since the root of the website / has been
proxied to some internal IP on which actual site will be served to
internet as
http://site2.exampleserver.com
but to the user it will appear as if http://site2.example.com is
coming from A only and user does not knows about presence of B.
And on internal server B where the site2.exampleserver.com is actually hosted
the server configuration is
<VirtualHost *:80>
ServerAdmin webmaster@(protected)
ServerName site2.exampleserver.com
DocumentRoot /var/www
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /var/www>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
</Directory>
</VirtualHost>
So the main site i.e. site2.example.com is itself running on a ReverseProxy
now if I have an application on site2.example.com to access that I
have to open a browser on it and type http://localhost:9090/portal
then how should I write a ProxyPass rule so that the request can pass
2 reverse proxies in this scenario.
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