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Installing OIOIOI

First, ensure that all dependencies are installed:

  • gcc/g++ (Ubuntu package: build-essential)
  • fpc (Ubuntu package: fp-compiler)
  • latex with languages used in sample tasks (Ubuntu packages: texlive-latex-base, texlive-lang-polish, texlive-lang-czechslovak, texlive-lang-european, texlive-lang-german)
  • latex packages (texlive-latex-extra, texlive-fonts-recommended, tex-gyre, texlive-pstricks, lmodern),
  • Berkeley DB library (Ubuntu package: libdb-dev)

It should be easier to begin with a separate folder at first:

mkdir sio2
cd sio2

and to install OIOIOI inside a virtualenv:

virtualenv venv
. venv/bin/activate

Then OIOIOI and its dependencies can be installed using the following commands:

git clone git://github.com/sio2project/oioioi.git
cd oioioi
pip install -r requirements.txt

OIOIOI is a set of Django applications, therefore you need to create a folder with Django settings and other deployment configuration:

cd ..
oioioi-create-config deployment
cd deployment

The created deployment directory looks like a new Django project, but already configured to serve the OIOIOI portal. You need to at least set the database configuration in settings.py.

In case of using PostgreSQL, install Psycopg2:

pip install psycopg2-binary

Finally initialize the database:

./manage.py migrate

We use PostgreSQL.

Then you need to copy static files, like images and styles, to the deployment directory:

./manage.py collectstatic

Basic configuration

In the simple configuration, OIOIOI will use the system-installed compilers, and will not use the safe execution environment. User's programs will be run with the normal user privileges. This is not a safe configuration and the judging will run quite slowly. It is to easily make OIOIOI up and running for testing purposes.

Run the Django web server and the evaluation daemons:

./manage.py supervisor

The supervisor process monitors all processes needed by OIOIOI, including the web server. It has many nice features.

You can create an administrator account by running:

./manage.py createsuperuser

If you see a locale error, you may want to circumvent it by providing another locale to the command:

LC_ALL=C ./manage.py createsuperuser

Now you're ready to access the site at http://localhost:8000.

Production configuration

  1. Begin with the simple configuration described above.
  2. Make sure you are in the deployment folder and the virtualenv is activated.
  3. Install RabbitMQ. We tested version 2.8.6 from RabbitMQ Debian/Ubuntu Repos. Anything newer should work as well.
  4. Uncomment and set BROKER_URL in settings.py to point to the configured RabbitMQ vhost. The default setting corresponds to the default RabbitMQ installation.

  5. Download sandboxes:

    ./manage.py download_sandboxes
  6. Disable system compilers and unsafe code execution by commenting out USE_UNSAFE_EXEC = True and AVAILABLE_COMPILERS = SYSTEM_COMPILERS and DEFAULT_COMPILERS = SYSTEM_DEFAULT_COMPILERS in settings.py.
  7. (optionally) Disable starting the judging process on the server, especially if you want to configure judging machines (see below) for judging, what is strongly recommended. Comment out the RUN_LOCAL_WORKERS = True setting.
  8. (required only for dedicated judging machines) Configure Filetracker server by setting FILETRACKER_LISTEN_ADDR and FILETRACKER_URL in settings.py and restart the daemons.
  9. Ensure that production-grade dependencies are installed:
    • uwsgi (pip install uwsgi)
  10. Turn on UWSGI by setting SERVER to uwsgi in settings.py and restart the supervisor.

  11. Install and configure web server. We recommend using nginx with uwsgi plugin (included in nginx-full Ubuntu package). An example configuration is automatically created as nginx-site.conf. Have a look there. What you probably want to do is (as root):

    cp nginx-site.conf /etc/nginx/sites-available/oioioi
ln -s ../sites-available/oioioi /etc/nginx/sites-enabled/
service nginx reload

    If you prefer deploying with Apache, an example configuration is created as apache-site.conf. You would need to install apache2 and libapache2-mod-uwsgi packages.

  12. Comment out DEBUG = True in settings.py. This is crucial for security and efficiency. Also set ALLOWED_HOSTS.
  13. Set admin email in settings. Error reports and teacher account requests will be sent there.
  14. Set SMTP server in settings. Otherwise new user registration (among others) will not work.

  15. You probably want to run manage.py supervisor -d automatically when the system starts. One way is to add the following line to the OIOIOI user's crontab (crontab -e):

    @reboot <deployment_folder>/start_supervisor.sh
  16. (optionally) If you have efficiency problems or expect heavy load, you may consider using gevent as uwsgi event loop. To do so, install gevent and set UWSGI_USE_GEVENT flag in settings.py.

  17. (optionally) You can also enable content caching. To do so, first you have to install dependencies:

    • memcached (Ubuntu package: memcached)
    • python-memcached (pip install python-memcached)

    Next, you have to uncomment the corresponding lines under "Cache" in settings.py and set the address of your memcached instance. Note that you can run memcached locally or on a remote server. For more information about memcached configuration see official documentation.

  18. (optionally) You can ensure users are automatically notified of certain events in the system - or notify them on your own - just enable the Notifications Server. For more information, consult the notifications/README.rst file.

Setting up judging machines

On every judging machine do the following:

  1. Create a new user account for the judging processes and switch to it.

  2. Set up virtualenv:

    virtualenv venv
. venv/bin/activate

  3. Download and install the sioworkers package:

    git clone https://github.com/sio2project/sioworkers
cd sioworkers
python setup.py install

  4. Copy and adjust configuration files:

    cp config/supervisord.conf{.example,}
cp config/supervisord-conf-vars.conf{.example,}

    Modify SIOWORKERSD_HOST and FILETRACKER_URL variables in config/supervisord-conf-vars.conf. By default, sioworkersd is run by supervisor on the same host as OIOIOI (SIO2). Filetracker server is also run there, by default on port 9999. You should consider changing WORKER_CONCURRENCY to smaller value if you are judging problems without sio2jail, so that each process has enough memory (depends on rules of concrete contest and USE_UNSAFE_EXEC in deployment/settings.py on OIOIOI host).

  5. Start the supervisor:

    ./supervisor.sh start

  6. You probably want to have the worker started automatically when system starts. In order to have so, add the following line to the sioworker user's crontab (crontab -e):

    @reboot <deployment_folder>/supervisor.sh start

Final notes

It is strongly recommended to install the librabbitmq Python module (on the server). We observed some not dispatched evaluation requests when running celery with its default AMQP binding library:

pip install librabbitmq

Celery will pick up the new library automatically, once you restart the daemons using:

./manage.py supervisor restart all

Installing on 64-bit machines

The sandboxes provided by the SIO2 Project contain 32-bit binaries. Therefore it is recommended that OIOIOI is installed on a 32-bit Linux system. Otherwise, required libraries may be missing. Here we list some of them, which we found needed when installing OIOIOI in a pristine Ubuntu Server 12.04 LTS (Precise Pangolin):

  • libz (Ubuntu package: zlib1g:i386)