Howto run locally

Making Jekyll build and serve GitHub Pages is "impossible" to get to work locally on Fedora. Docker to the rescue.

docker run -v $PWD:/srv/jekyll -v $PWD/vendor/bundle:/usr/local/bundle -p 4000:4000 -it jekyll/jekyll:3 bash
bundler init
bundler add github-pages

Mixing up bundle and bundler had me chasing my own tail for hours, giving me a backtrace starting with:

Errno::EACCES: Permission denied @ rb_sysopen - /srv/jekyll/Gemfile

When "serving" Jekyll will automatically watch for file changes and rebuild. The browser will connect back to the Jekyll server on port 35729, on which notifications about updates will be published.

docker run -v $PWD:/srv/jekyll \
           -v $PWD/vendor/bundle:/usr/local/bundle \
           -p 4000:4000 \
           -p 35729:35729 \
           jekyll/jekyll:3 jekyll serve

Address security issues

Update the Gemfile with the newest version of github-pages from https://rubygems.org/gems/github-pages

Start the Docker container with the command from above, and run the following inside:

bundler update