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Apache2 on Ubuntu

Enabling User Directory

This is how to set up Apache2 on Ubuntu so that, when hxxp://server/~username is accessed, the browser returns the content in /home/username/public_html.

First, user directory is now a mod in Ubuntu's apache2. If you have not installed the mod, then execute the following command:

sudo a2enmod userdir

Second, edit /etc/apache2/apache2.conf and add the following lines:

<IfModule mod_userdir.c>
    UserDir public_html
</IfModule>

<Directory /home/*/public_html>
    AllowOverride FileInfo AuthConfig Limit
    Options Indexes SymLinksIfOwnerMatch IncludesNoExec
</Directory>

Third, execute the following command:

cd /etc/apache2/mods-enabled
sudo ln -s /etc/apache2/mods-available/userdir.conf userdir.conf
sudo ln -s /etc/apache2/mods-available/userdir.load userdir.load

Forth, restart your apache2:

sudo /etc/init.d/apache2 restart

Rails Deployment with Mongrel on Ubuntu Guide

This guide plagiarizes Punneng's Rail::Deployment (Ubuntu - Apache - Subversion - Mongrel - Capistrano) article.

This guide assumes that you already have rails installed.

Create a New User

For each one application, you should create a new user for exclusive use by the application. Put the user in the www-data group.

useradd username
usermod -g www-data username

Edit /etc/sudoers and add:

username ALL = (ALL) ALL

Install Mongrel and Mongrel Cluster

sudo gem install daemons mongrel mongrel_cluster

Install Your Rails Application Somewhere

Well, this step is totally up to you.

Installing Grader Web Interface

Installing HAML

The grader makes use of HAML. So you need to install it first.

gem install haml --no-ri

Checking out the Grader Web Interface

First, make a directory that will contain all the grader files. In my case, I make a directory called "grader" inside my home directory.

mkdir ~/grader

Inside the directory, you check out the web interface.

svn co http://theory.cpe.ku.ac.th/grader/web/tags/0.1 ~/grader/web

Setting up the Database

cd ~/grader/web/config
cp database.yml.SAMPLE database.yml

Then, edit database.yml so that it reflects the database setting of your machine.

Note: In Ubuntu, the database socket is not located at /tmp/mysql.sock as it is in other distributions. You need to add one extra line in database.yml to tell rails this:

 adapter: mysql
 socket: /var/run/mysqld/mysqld.sock
 database: ioi
 username: ioi
 password: whateverpassword
 host: localhost

Next, you do the migration:

cd ~/grader/web
rake db:migrate

Check your MySQL to see if the tables actually appear.

Test the Grader for the First Time

Then, run the server

ruby script/server

Go check http://localhost:3000. You can login as root and the password is ioionrails. You should change the password immediately and logout.

Set Up Mongrel Cluster

Have mongrel create a config file for you:

mongrel_rails cluster::config -e production -p 5000 -a 127.0.0.1 -N 2 -c ~/grader/web

Start the server.

cd /~grader/web
mongrel_rails cluster::start

See if it works by checking out http://localhost:5000/.

Judge

see main article Installing and configuring Judge