Jekyll Docker Build Error Fix

In this tutorial, you'll learn about Jekyll Docker Build Error Fix. We cover key concepts, practical examples, and best practices.

The Problem

bundler: failed to load command: jekyll (/usr/local/bundle/bin/jekyll)
Gem::FilePermissionError: You don't have write permissions for the /usr/local/bundle directory.

Running Jekyll in Docker with a mounted volume creates permission mismatches between the container user and the host user.

Wrong

FROM ruby:3.0
RUN gem install jekyll bundler
CMD ["jekyll", "serve"]

Output: permission errors when mounted volume files are owned by a different user.

Right

FROM ruby:3.0

RUN apt-get update && apt-get install -y nodejs \
    && gem install jekyll bundler

WORKDIR /site
EXPOSE 4000

ENTRYPOINT ["jekyll"]
CMD ["serve", "--host", "0.0.0.0"]

Build and run:

docker build -t jekyll-site .
docker run --rm -p 4000:4000 \
    -v "$PWD:/site" \
    jekyll-site serve --host 0.0.0.0 --force_polling

Output:

Server address: http://0.0.0.0:4000
Server running... press ctrl-c to stop.

Prevention

• Use --force_polling for file watching in Docker
• Mount volumes as the same UID as the container user
• Use docker-compose for consistent configuration

Common Mistakes with docker build

1. Using return to exit a function early instead of wrapping a pure value in the monad
2. Mixing let bindings with <- bindings in do notation, producing type errors
3. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors

These mistakes appear frequently in real-world JEKYLL code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

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