Docker for hosting Sinatra apps
docker run --name my-sinatra-app \
-p 80:80 \
-v /path/to/sinatra/app:/usr/src/app \
-d erikap/ruby-sinatra
The Docker image exposes port 80.
The Ruby source code is mounted in /usr/src/app. The main Sinatra file is configured at container start up via the MAIN_APP_FILE environment variable. If not set, it defaults to web.rb.
Dependencies can be installed through Bundler by providing a Gemfile. The Sinatra gem is installed by default. The environment can be set via the RACK_ENV environment variable. If not set, it defaults to production.
The image uses Sinatra Reloader for automatic reload. To enable the reload, add the following line in your MAIN_APP_FILE
require 'sinatra/reloader' if development?
To ensure that stopping of the container happens instantly, start docker with the --init option or use init: true when using a docker-compose.yml file.