VirtualHost Same ServerName Different Directories - apache

Question

I have a running production website assigned to a host (redmine application). I need to add a new application to the same host as a sub-directory.
This is the current virtualhost configuration for redmine application which runs at base folder of host.
<VirtualHost *:80>
ServerName redmine.hostname.com
DocumentRoot "C:/BitNami/redmine-2.5.1-1/apps/redmine/htdocs/public/"
RewriteEngine On
RewriteRule ^/(.*)$ balancer://redminecluster%{REQUEST_URI} [P,QSA]
ProxyPass / balancer://redminecluster
ProxyPassReverse / balancer://redminecluster
<Proxy balancer://redminecluster>
BalancerMember http://127.0.0.1:3001
BalancerMember http://127.0.0.1:3002
</Proxy>
</VirtualHost>
So this application already runs at redmine.hostname.com. I want to add my own application and i want it to run at redmine.hostname.com/myapp/.
Whatever i did, i couldn't achieve this. I must not change the path of redmine, i must add new app to same virtualhost. There are no open ports other than 80, so i must make it run at redmine.hostname.com/myapp/
Basically, the redmine application must reply all requests that do not start with redmine.hostname.com/myapp/. My App should reply all requests that start with redmine.hostname.com/myapp.
What settings should i use?

Answer 1

If your application /myapp is located is c:/myappdir, the easiest way to configure apache to do what you want is to use this configuration:
<VirtualHost *:80>
ServerName redmine.hostname.com
DocumentRoot "C:/BitNami/redmine-2.5.1-1/apps/redmine/htdocs/public/"
Alias /myapp "c:/myappdir"
ProxyPass /myapp !
ProxyPass / balancer://redminecluster/
ProxyPassReverse / balancer://redminecluster/
<Proxy balancer://redminecluster>
BalancerMember http://127.0.0.1:3001
BalancerMember http://127.0.0.1:3002
</Proxy>
</VirtualHost>
Using an exclamation point as target for ProxyPass will exclude /myapp from the proxy configuration as documented here. Additionally you don't need a special RewriteRule since you don't modify the requests to redmine, ProxyPass should be enough.

Answer 2

It depends a little on whether your own app is hosted on the apache server itself, or it's proxied to another server/process.
If it's on the apache server itself, then just put 'myapp' into the document root. Then you need to remove your ProxyPass line and replace it with a locationmatch block
<VirtualHost *:80>
ServerName redmine.hostname.com
DocumentRoot "C:/BitNami/redmine-2.5.1-1/apps/redmine/htdocs/public/"
RewriteEngine On
RewriteRule ^/(.*)$ balancer://redminecluster%{REQUEST_URI} [P,QSA]
<LocationMatch "^(?!/myapp)">
ProxyPassMatch balancer://balancer://redminecluster
</LocationMatch>
ProxyPassReverse / balancer://redminecluster
<Proxy balancer://redminecluster>
BalancerMember http://127.0.0.1:3001
BalancerMember http://127.0.0.1:3002
</Proxy>
</VirtualHost>
So, the strategy is to forward everything which doesn't match /myapp to your existing redmine application. Everything matching /myapp will go to the document root. If your own app is proxied, then you need another locationmatch block which proxies /myapp to the correct location.