Flatcar

NOTE

This repo is no longer being maintained. Users are welcome to fork it, but we make no warranty of its functionality.

Developing Rails applications with Docker is easy with Flatcar. Using native Docker commands, Flatcar will build your application and link it to whatever database you choose to use.

##Installation and Dependencies Flatcar depends on Docker. You must have Docker and Docker Compose installed on your machine in order for Flatcar to work. If you are on Linux, install Docker with official packages. On a Mac or Windows, you will need to run a lightweight VM in order to use Docker. You can do this via Docker Toolbox or by running a VM of your choice.

Then, gem install flatcar and you're ready to get rolling.

##Usage ####Creating a new Rails project From the desired parent directory, run flatcar init $new_project_name. This will initialize a new Rails application in a directory of the same name.

####Using an existing Rails project Run flatcar init $path_to_project to begin a new project. You can initialize a flatcar project from the current directory by simply running flatcar init.

flatcar init ($new_project_name|$path_to_project) will perform the following operations:

1. If no project path is specified, it runs rails new -B $app_path.
2. Flatcar generates a Dockerfile for the Rails service
3. A docker-compose.yml file is generated for the entire project.

Flatcar applications are run via docker-compose in the project's directory. If you're using a VM, make sure to create appropriate port forwarding rules in order to view the application in your browser. Flatcar will bind 3000:3000 from host:container via Docker's -p flag at runtime.

To run the application, cd into the project directory and run docker-compose up. To run the services in the background, use the -d flag.

####init Flatcar uses the following syntax: flatcar [global options] init [command options] [APP_NAME]

The init command initializes a Rails application with an optional base image and database specified. If executed within an existing Rails project directory without the APP_NAME argument, the Flatcar generated files will be placed in the current directory. If the command is executed with the optional APP_NAME argument, a new Rails project will be generated along with the Flatcar files in a subdirectory of the current directory.

#####Selecting a base image You can specify which OS to use for your Rails service by passing in the -b flag. Valid options are alpine, ubuntu, or rails (debian-based). If no option is given, the default Rails image will be used.

#####Choosing a database You can also specify which database to use with your Rails application. Valid options are mysql, postgresql, or sqlite3. If mysql or postgresql is chosen, a new database service will be defined in the generated docker-compose.yml file. If no option is given, sqlite3 will be used.

#####Command Options

Command	Description

• -G, --[no-]skip-git |Skip .gitignore file
• -J, --[no-]skip-javascript |Skip JavaScript files
• -O, --[no-]skip-active-record |Skip Active Record files
• -S, --[no-]skip-sprockets |Skip Sprockets files
• -T, --[no-]skip-test-unit |Skip Test::Unit files
• -V, --[no-]skip-action-view |Skip Action View files
• -b, --base=BASE_IMAGE |Sets the base image to use in the Dockerfile (default: rails)
• -d, --database=DATABASE |Sets the database to use. (default: sqlite3)
• --[no-]dev |Setup the application with Gemfile pointing to your Rails checkout
• --[no-]edge |Setup the application with Gemfile pointing to Rails repository
• -j, --javascript=JAVASCRIPT |Preconfigure for selected JavaScript library. (default: jquery)
• -m, --template=TEMPLATE |Path to some application template (can be a filesystem path or URL) (default: none)
• --[no-]skip-keeps |Skip source control .keep files
• --[no-]skip-spring |Don't install Spring application preloader

##Testing Flatcar uses rspec. To run the test suite, run bundle exec rspec spec.

##Contributing Flatcar uses an Apache License and your contributions are welcome. First, git clone https://github.com/CenturyLinkLabs/flatcar.git. Flarcar uses GLI, which is a very useful tool for writing command line tools. More information on GLI can be found on the project page as well as the GitHub repo. To run flatcar in development mode, we recommend passing in GLI_DEBUG=true to your run command.