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Last pushed: 4 months ago
Short Description
Fetch project from a git url and run using rails, sinatra or other tools
Full Description

Maestrano web-ruby

Docker image packed with ruby, git and nginx.


Launch a rails app from a public github repository

docker run -P -d -e GIT_URL= -e GIT_BRANCH=master maestrano/web-ruby

Launch a rails app from a private github repository

docker run -P -d -e GIT_URL= -e GIT_BRANCH=master maestrano/web-ruby

Launch a rails app from a private S3 bucket

docker run -P -d -e S3_URI=s3://cdn-prd-maestrano/pkg/sample/sample_app_rails.tar.gz \

Launch a rails app from a public S3 bucket
Note: it is preferable to specify the region of your bucket when no authentication is used

docker run -P -d -e S3_URI=s3://cdn-prd-maestrano/pkg/sample/sample_app_rails.tar.gz \
  -e S3_REGION=ap-southeast-1

Launch a rails app from a local folder

docker run -P -d -v /some/local/app:/app maestrano/web-ruby

Process configuration

Maestrano web-ruby uses your Procfile to run processes. See the foreman site for more information on procfiles.


web: bundle exec puma -t 5:5 -p ${PORT:-3000}
worker: bundle exec rake jobs:work

The foreman configuration can be overriden at runtime by setting the FOREMAN_OPTS environment variable. Considering the Procfile above running the following command would only run the "web" proc.

docker run -P -d -e FOREMAN_OPTS="-m web=1" -e GIT_URL= maestrano/web-ruby


For Rails 4 you may want to add the rails_12factor gem to your Gemfile under the production group to redirect output to STDOUT. For Rails 5 you can add STDOUT logging directly your production.rb file.

See for more information.

Gem caching using Gemstash

If you have a gemstash server running you can pass its URL to the container via the GEMSTASH_SERVER environment variable to speed up the entrypoint.


docker run -P -d -e GEMSTASH_SERVER="http://someserver:9292" -e GIT_URL= maestrano/web-ruby

Nginx configuration

You can customise the default nginx configuration for your app to accomodate any kind of requirements for serving your static assets and SPAs.
Just drop a nginx.conf file in the root of your folder and it will automatically be picked up by web-ruby.

The default nginx configuration file is available here.

Deploy hooks


If you need to perform specific configuration activities at deploy time - such as fetching a file from a remote S3 repository - you can specify a deploy hook at the root of your project called ".deploy-hook". This file must be a shell script. Any environment variable passed to the container will be available to the deploy-hook script. The deploy-hook script is run after the project has been checked out and before bundler is run.

Example: PROJECT_ROOT/.deploy-hook

# Example of deploy hook
echo "This is a deploy hook!"
echo "I run after checkout..."
echo "...and before bundler"


The post-deploy-hook behavior is similar to the deploy-hook, but it is run after the deployment and just before last command is performed (eg. "foreman start").

Docker Healthcheck

The image provides a default Docker healthcheck which curls your app on the root path. You can customize this healthcheck by adding a .healthcheck in the root directory of your application. This healtcheck file should be a bash script returning a non-zero exit code on failure. The healthcheck can be completely disabled by adding "NO_HEALTHCHECK=true" to the list of container environment variables.

Example: PROJECT_ROOT/.healtcheck

# Example of custom healthcheck
curl http://localhost/ping && \
curl http://localhost/version
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