Issue

I'm have a an Apache HTTP server that has a reverse proxy to a tomcat server. However, I only want the reverse proxy to happen when the client uses the subdomain www. This is because I want to use other subdomains to point to other applications, such as email.

e.g. www.example.com will go display the apache tomcat webapp.

The way to do this, I presume, is to configure my DNS so that every subdomain I use will point to my server. Right now, in addition to www, that is server.example.com and posfixadmin.example.com. However, the issue is that all my subdomains end up pointing to tomcat.

So when I try to visit postfixadmin.example.com/setup.php to set up postfixadmin through its web setup, it ends up taking me to my tomcat webapp's 404.

Here is my virtualhost configuration:

<VirtualHost www.example.com:80>
    ServerName http://www.example.com
    ProxyPass / http://localhost:8080
    ProxyPassReverse / http://localhost:8080
</Virtualhost>

<VirtualHost server.example.com:80>
    ServerName server.example.com
    DocumentRoot /var/www/html/
    RewriteEngine on
    RewriteCond %{SERVER_NAME} =server.example.com
    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} {END,NE,R=permanent}
</VirtualHost>

<VirtualHost postfixadmin.example.com:80>
    ServerName postfixadmin.example.com
    DocumentRoot /var/www/postfixadmin/public

    ErrorLog /var/log/httpd/postfixadmin_error.log
    CustomLog /var/log/httpd/postfixadmin_access.log combined

    <Directory />
        Options FollowSymLinks
        AllowOverride All
    </Directory>

    <Directory /var/www/postfixadmin/public>
       Options FollowSymLinks MultiViews
       AllowOverride All
       Order allow,deny
       allow from all
    </Directory>
</VirtualHost>

EDIT It looks like the proxy conf file doesn't do anything (??). I decided to experiment around and change the first virtualhost servername to the following:

<VirtualHost *:80>
    ServerName abcd.example.com
    ProxyPass / http://localhost:8080
    ProxyPassReverse / http://localhost:8080
</Virtualhost>

Then, I restarted and reloaded Apache...But for some reason, going to www.example.com STILL took me to the tomcat webapp! Does anyone know what drives this?

Solution

I got it!

It turns out that the problem was in the ssl configuration file - the :443 ports were overlapping.

Thanks for the help!

Answered By - Chirag Kawediya

Wednesday, November 17, 2021

[SOLVED] Apache Reverse Proxy For Specific Subdomain

Issue

Solution