Tag: Tomcat

Configure a Reverse Proxy with Apache

In a previous post, I discussed the details required to set up Subsonic on Ubuntu Server. The problem with Subsonic is that it runs on Tomcat on a non-standard port. The rest of my web applications run in Apache on port 80. Therefore, it would be nice if instead of having to go to http://athos.zacintosh.com:8180/subsonic/, I could simply go to http://athos.zacintosh.com/subsonic/. The solution is called a reverse proxy. Reverse proxies can do things like load balance between multiple web servers or simply make resources on an internal web server available externally. In this case, I am using a reverse proxy to make a web application available on a different port available on the standard port 80.

The set up is fairly simple. On Ubuntu, it should be as simple as issuing this command (as root) to enable the proxy modules:

a2enmod proxy_http

Next I inserted the following into /etc/apache2/conf.d/subsonic.conf to make it available on all websites running on my server. If you only wanted it to be available for a single website, you could insert this into a site inside of /etc/apache2/sites-available/.

ProxyRequests Off
ProxyPreserveHost On
<Proxy *>
    Order allow,deny
    Allow from all
</Proxy>
ProxyPass /subsonic/ http://localhost:8180/subsonic/
ProxyPassReverse /subsonic/ http://localhost:8180/subsonic/

The configuration above says to not proxy all requests (not act as a forward proxy server). The ProxyPass and ProxyPassReverse set up the actual retrieval of data from Subsonic running on Tomcat. You need to replace the localhost and the port number with the specific items for your configuration. Finally, you need to reload the Apache configuration:

/etc/init.d/apache2 force-reload

Now Subsonic should be available on port 80 just like everything else running on your web server with Apache.

Install Subsonic on Ubuntu Server

Subsonic is a free, web-based media streaming application. After evaluating it alongside Jinzora and Sockso, I selected it for use on my servers. Internally, I have been using Firefly Media Server (previously called mt-daapd) to make music available to different desktop music players. Subsonic had several features that made it a good choice including allowing music from several different directories, Last.fm scrobbling support/integration, and multiple users with passwords and support for LDAP integration.

I installed Subsonic on a server running Ubuntu Hardy Heron Server. I built on a previous tutorial for installing Subsonic on Ubuntu.

First, I install the necessary Java packages, Tomcat, and Lame. I broke it into three installs to be safe. It could probably be done in one.

apt-get install java-common sun-java6-bin sun-java6-jdk sun-java6-jre
apt-get install tomcat5.5
apt-get install lame

Next, I stopped Tomcat before changing the Tomcat configuration and installing the Subsonic web application.

/etc/init.d/tomcat5.5 stop

Next, I disabled the Tomcat security stuff. It’s required for Subsonic to work. You could do this by editing the file directly (/etc/init.d/tomcat5.5), but I use Sed so that I can automate the installation process in a script.

cd /etc/init.d/
mv tomcat5.5 tomcat5.5.bak
sed "s/TOMCAT5_SECURITY=yes/TOMCAT5_SECURITY=no/" tomcat5.5.bak > tomcat5.5
chmod +x tomcat5.5
rm tomcat5.5.bak

Next, I downloaded, decompressed, and installed the subsonic application.

cd /tmp/
wget http://superb-east.dl.sourceforge.net/sourceforge/subsonic/subsonic-3.6-war.zip
unzip subsonic-3.6-war.zip -d subsonic
mv subsonic/subsonic.war /var/lib/tomcat5.5/webapps/

Subsonic expects certain directories to exist. The following creates those directories and sets the permissions.

mkdir /var/subsonic
mkdir /var/subsonic/playlists
mkdir /var/subsonic/transcode
chown -R tomcat55:nogroup /var/subsonic

Subsonic uses Lame to transcode/compress mp3s for streaming. The next two lines make Lame available to Subsonic.

cd /var/subsonic/transcode
ln -s /usr/bin/lame lame

Now we can start Tomcat again.

/etc/init.d/tomcat5.5 start

I always like to clean up after my installs. This removes the files we downloaded and no longer need any more.

rm -R /tmp/subsonic*

Subsonic should now be running and available at http://localhost:8180/subsonic/. The port might vary depending on the installation of Tomcat. Log in. You can change the password by clicking on “Settings” and then “Users” and then selecting the admin account.

Next, I configured LDAP authentication. It was as simple as clicking on “Settings” and then “Advanced” and then “Enable LDAP authentication.” I then filled in the following:

  • LDAP URL: ldap://athos.lund:389/dc=lund
  • LDAP search filter: (uid={0})

I left the “LDAP manager DN” and “Password” blank. I checked “Automatically create users in Subsonic” so that any user in LDAP can automatically log into Subsonic.

If you would like to make Subsonic available on port 80 like most web applications instead of port 8180, check out my post on Reverse Proxies.