How to map a subdomain to a tomcat 8 web application running on port 8086

Question

I have a subdomain test.example.com. I have a java web application running in tomcat 8.5 on port 8086.

In /opt/tomcat/conf/server.xml I have a virtual host defined like below.

<Host name="canicarry.thehatapps.com" appBase="webapps/SecondAmendmentSupporters-0.2" unpackWARs="true" autoDeploy="true">
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="canicarry_access_log" suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
</Host>

I have an apache2 conf defines like below. /etc/apache2/sites-available/test.example.com.conf

<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName www.example.com

        ServerAdmin webmaster@localhost
        ServerName test.example.com
        ServerAlias www.test.example.com.com
        DocumentRoot /var/www/test.example.com/public_html

        <Directory /var/www/test.example.com/public_html>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride All
                Order allow,deny
                allow from all
        </Directory>

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

In public_html I have .htaccess defined like below.

RedirectPermanent / http://test.example.com:8086

My goal is to be able to hit the myapp-02 tomcat web app on port 8086 like so http://canicarry.thehatapps.com:8086

I'm not sure what's wrong but I get 404. I can't seem to resolve http://canicarry.thehatapps.com:8086 to my web app running in tomcat.

Any help would be appreciated.

EDITED----------- Using this in my apache conf file helped but still running into issues.

<VirtualHost canicarry.thehatapps.com/*:80>
  ServerName canicarry.thehatapps.com
  ProxyRequests Off
  ProxyPass / ajp://localhost:8086/SecondAmendmentSupporters-0.2
  ProxyPassReverse / ajp://localhost:8086/SecondAmendmentSupporters-0.2
</VirtualHost>

When I type http://canicarry.thehatapps.com:8086, I'm taken to

http://104.238.96.249:8086/SecondAmendmentSupporters-0.2/

Which is the full url to my tomcat application. However, when I append an endpoint, it doesn't resolve. In addition, the url should still be http://canicarry.thehatapps.com:8086. It shouldn't show the full url to the tomcat application instance.

For example, http://canicarry.thehatapps.com:8086/places should return a list of places from the service but it doesn't resolve the url.

Answer 1

Your <VirtualHost *:80> is telling apache to listen on port 80.

If you want the application to be exposed over port 8086 then you need to proxy the port 8086 to your tomcat server. You can do this using the ajp_proxy module of apache.

<VirtualHost test.example.com:8086>
  ServerName test.example.com
  ProxyRequests Off
  ProxyPass /examples ajp://127.0.0.1:8086/examples
  ProxyPassReverse /examples ajp://localhost:8086/examples
</VirtualHost>

See below article for details

https://linuxconfig.org/how-to-set-up-apache-webserver-proxy-in-front-of-apache-tomcat-on-red-hat-linux