These Dockerfiles allow you to run DOMjudge inside a Docker container. For all further configuration needs and advanced guides, see the DOMjudge docs. The repository builds the latest nightly DOMjudge version daily and pushes it to Docker Hub.
Use Docker Compose to build the images:
docker compose -f docker-compose-domserver.yml up -d
docker compose -f docker-compose-judgehost.yml up -d
Swap out the docker domjudge images to fit your needs. To support custom executables, you need to rebuild the judgehost container, see below.
All environment variables can be set in the relevant *.env files.
The containers are built myself, the images are available on Docker Hub. You can build the containers yourself by taking a look at the README. The packaging scripts are based on the official DOMjudge/domjudge-packaging and WISVCH/domjudge-packaging repositories.
The domserver compose file comes bundled with a MariaDB container. If you want
to use this, you only need to specify a password for the mysql root user and for
the domjudge user by setting MYSQL_ROOT_PASSWORD to the root password, and
MYSQL_PASSWORD to the domjudge user password. It is also possible to specify
a database name and domjudge user name (both default to domjudge) by setting
MYSQL_DATABASE and MYSQL_USER.
The domserver and the MariaDB container are both configured to use volumes for
persistent storage. These can be found in the default volumes directory of docker.
The domserver volume just contains the webapp root, while the MariaDB volume
contains the whole database.
It is recommended to read this document carefully before starting the containers.
The domserver will be available on port 12345 of the container host. You can
access the web interface on /domjudge/ (e.g. http://localhost:12345/domjudge/).
To access the domserver from the internet, you need to set up your host to forward
the port to the container, e.g. using nginx.
Custom executables are provided in the executables directory. You can add them
using the web interface. In particular, ghc will have some problems with the default
configuration, so you will need to look at a custom executable.
Most of your configuration will be done in the web interface. You can log in
using the username admin and the password displayed in the logs of the
domserver container.
Go to the Config checker to verify that everything is set up correctly.
If you need to, you can access the MariaDB by running:
$ docker exec -it mariadb mariadb -u domjudge -pdjpw
MariaDB [(none)]> USE domjudge;
or from the host:
$ mariadb -h localhost -P 13306 -u domjudge -pdjpw
MariaDB [(none)]> USE domjudge;
Version 8.3 also adds an Adminer container in the web interface to access the database.
The custom built images have these limits set to 2GB by default! Otherwise, to upload files larger than 256MB (e.g. large problem sets), use this to increase the limits in the fpm config:
docker exec -it domserver sed -ri -e 's/(php_admin_value\[memory_limit\] =).*/\1 -1/' -e 's/(php_admin_value\[upload_max_filesize\] =).*/\1 2G/' -e 's/(php_admin_value\[post_max_size\] =).*/\1 2G/' /opt/domjudge/domserver/etc/domjudge-fpm.conf
docker exec -it domserver supervisorctl restart php
Admittedly, this is a bit hacky, but it works and is better than rebuilding the container.
Also be sure to increase the client_max_body_size in your nginx config of the host server.
By default, four judgehosts are started. You can change this by modifying the
docker-compose-judgehost.yml file. You can also change the hostname of the
judgehosts. Each judgedaemon will be bound to one CPU core. You can change this
by modifying the DAEMON_ID environment variable.
As for the judgehost, you need to run the container in privileged mode to use
cgroups. You also need to specify the domserver URL and judgehost user password
by setting DOMSERVER_HOST, JUDGEDAEMON_PASSWORD. You can set DOMJUDGE_USER
as well, but it defaults to judgehost. You should also specify a hostname for
this container to identify it in the domserver.
Most importantly: You need to specify the following kernel parameters on the container host to enable cgroups:
cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0 isolcpus=2
This is done by editing /etc/default/grub and adding the parameters to GRUB_CMDLINE_LINUX_DEFAULT.
Then run sudo update-grub and reboot.
The judgehost is based on ubuntu:jammy. If you want to support more programming languages, you need to edit
install_languages.sh inside the docker folder to enable, disable, add or update languages.
You can add arbitrary packages or PPAs to support more. Currently, the
script tries to install up-to-date versions of the languages, as of writing.
Enter the judgehost container and chroot to verify that everything is set up correctly:
docker exec -it judgedaemonX /bin/bash
docker exec -it judgedaemonX /opt/domjudge/judgehost/bin/dj_run_chroot
As of writing, the following languages are installed:
- Bash (GNU Bash 5.1)
- C (gcc 12.1 with C2X)
- C++ (gcc 12.1 with C++23)
- Haskell (GHC 8.8)
- Java (OpenJDK 21)
- JavaScript (Node.js 20.3 with ES2023)
- PyPy3 (7.3 with Python 3.9)
- Python3 (Python 3.13) (with numpy & scipy)
- Rust (Rust 1.65)
To update the containers, fetch the latest images or change the version specified in the compose file by running:
docker compose -f docker-compose-domserver.yml pull
docker compose -f docker-compose-judgehost.yml pull
Then run the setup from above (up -d) to recreate and restart the containers.
Fortunately, the files in the volumes directory are persistent, so you don't
need to worry about losing your data.
If you have problems trying to run the containers, you can check the logs:
docker logs domserver
docker logs judgedaemonX
For more information, see the very helpful DOMjudge docs, try to find help in the source code, or ask me.
This repository is based on WISVCH/docker-domjudge with aspects of DOMjudge/domjudge and more.