Judge0 is robust, scalable, and open-source code execution platform. Which enable us to create large and scalable softwares for competetive-programming, online IDEs,, online code editors, programming assessments, etc.

It contains support for 60+ languages.

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Installating judge0

We are going to install judge0-v1.13.1 on our PCs.

System Requirements

Judge0 has been tested only for linux platforms that’s why there is no official support for installations in other platforms.

Note:- We are going to see how to install judge0 in Windows and Linux.

Prerequisites

1. A Laptop or desktop PC with Wndows or Linux .

2. A stable internet connection.

With the above prequisites lets proceed for the installation

Preinstallations

Windows WSL

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For installation of WSL we need to enable some features in out windows machine.

Enabling WSL and Virtual Machine platform'

1. Press 🪟 + r and type optionalfeatures.exe click on OK.

   

2. Allow for permission.

3. Mark check for enabling Virtual Machine Platform and Windows Subsystem For Linux and press ok.

   

4. Wait for checking requirements.

5. Click on restart.

Installing wsl

1. Open powershell.

2. Install wsl package

wsl.exe --install

3. Check installation using

wsl -v # or wsl --version

4. Install Ubuntu

# wsl --install <Distro_name>
wsl --install # it will install latest version of Ubuntu 24.04 as a default

5. Using ubuntu using WSL

 wsl -d Ubuntu # For using any other distro of linux replace Ubuntu with the Name of Distribution

Ubuntu (Linux platform)

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1. Use sudo to open file /etc/default/grub

sudo nano /etc/default/grub

1. Add systemd.unified_cgroup_hierarchy=0 in the value of GRUB_CMDLINE_LINUX variable.

GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=0"

If the line already contains other parameters, ensure you add this parameter within the quotes, separated by a space. For instance:

GRUB_CMDLINE_LINUX="quiet splash systemd.unified_cgroup_hierarchy=0"

2. Apply the changes:

sudo update-grub

3. Restart your server:

sudo reboot

Common Installation

Step 1: Open Linux CLI

Step 2: Update your System

sudo apt update -y && sudo apt upgrade -y

Step 3: Download Docker and Docker Compose (Skip If you have already installed)

sudo apt install docker.io && sudo apt install docker-compose

Step 4: Install unzip Package

sudo apt install unzip

Step 5: Download the judge0’s release archive

wget https://github.com/judge0/judge0/releases/download/v1.13.1/judge0-v1.13.1.zip

Step 6: Extract the judge0’s release archive

unzip judge0-v1.13.1.zip

Step 7: Go into judge0-v1.13.1 extracted folder

cd judge0-v1.13.1

Step 8: Update the variable REDIS_PASSWORD in the judge0.conf file.

nano judge0.conf

Instead of YourPassword use generated password for both REDIS_PASSWORD and POSTGRES_PASSWORD.

Passwords can be different(prefer) or same

1. Write and Save

   press ctrl + o and save as same name

2. To come out the file :

   press ctrl + x

‼️Do not modify docker-compose.yml, modify it only if you know what are you doing 💀.

Step 9: Run these commands to initialize redis and postgres:

docker-compose up -d db redis # use sudo for smooth experience

wait for initialization of redis and postgres.

Step 10: Run these commands to initialize workers and server:

docker-compose up -d # use sudo for smooth experience

After these commands end, your instance of Judge0 CE v1.13.0 is now available at : http://0.0.0.0:2358 or http://localhost:2358 don’t worry your installation is working if you are getting empty white-page.

Helping links:

• Judge0 Dummy Client Page - go to directory ‘/dummy-client.html’

  you can try here dummy code executions

• Judge0 Languages Page - go to directory ‘/languages’

• Judge0 Documentation Page - go to directory ‘/docs’

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From WSL to Docker-Desktop (for windows users)

1. From the Docker menu, select Settings > General

2. Make sure that ‘Use the WSL 2 based engine’ is selected

   

3. Then go to Settings > Resources > WSL Integration in Docker Desktop and enable Ubuntu.

   

4. Now you can see containers running in the docker-desktop.

   

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Message: 'No such file or directory @ rb_sysopen - /box/script.js',

This may or may not work for your operating system due to some architecture issues over operating system or machines

Step 1 : Go to ~/.docker/desktop/settings-store.json

cd ~/.docker/desktop/settings-store.json # not use settings.json

Step 2: Append “DeprecatedCgroupv1”: true in settings-store.json file or not use settings.json

{
    “DeprecatedCgroupv1”: true
}

Step 3: Restart docker

How to re run the judge0 container?

Step 1: Open the judge0 folder with files (docker-compose.yml and Jude0.conf).

Step2: Open the terminal and use

docker-compose up -d

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References

• Judge0

• Judge0 github repository

• Judge0 Official installation documentation.

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Suggestion

• If you are somehow failed to install/config judge 0 try reinstalling from start.