Local Development - Developing with a local copy of PrairieLearn

Use these instructions to launch PrairieLearn on your local machine using Docker.

Prerequisites

These are one-time setup steps.

Install Docker Desktop
- Download from: https://www.docker.com/products/docker-desktop
- After installation, start the Docker app and ensure the whale 🐳 icon is running in your menu bar.
Sign in to Docker
```
docker login
```
Clone your course repo

Your course repo is, for example:
```
git clone git@github.com:PrairieLearn/pl-ucsb-cmpsc110.git
cd pl-ucsb-cmpsc110
```

Run PrairieLearn (no external grader)

Note that many courses do use an external grader, including CMPSC 5A.
For courses with an external grade, follow these instrucitons instead of this step.

First, cd into the directory where you cloned the PrairieLearn course repo, and update the main branch.

cd pl-ucsb-cmpsc110
git pull origin main

Then start docker:

docker run -it --rm -p 3000:3000 -v `pwd`:/course prairielearn/prairielearn

Access PrairieLearn in Browser

Once you see this message:

info: PrairieLearn server ready, press Control-C to quit
info: Go to http://localhost:3000

Open your browser and go to http://localhost:3000
Click the Load from Disk button upper right:
After the course loads, click the Back to Previous Page button upper left:
Then you should see your course, and be able to try questions.

Common Error: Docker Daemon Not Running

If you see this error:

Cannot connect to the Docker daemon at unix:///Users/.../.docker/run/docker.sock

Solution:

Open Docker Desktop from Applications or Launchpad
Wait for it to fully start (🐳 whale icon turns green)
Then retry the docker run command

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