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Ruby - Source-to-Image (<strong>s2i</strong>) | Using Images | OpenShift Enterprise 3.0
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Ruby

Overview

OpenShift provides s2i enabled Ruby images for building and running Ruby applications. The Ruby s2i builder image assembles your application source with any required dependencies to create a new image containing your Ruby application. This resulting image can be run either by OpenShift or by Docker.

Versions

Currently, OpenShift provides version 2.0 of Ruby.

Images

This image comes in two flavors, depending on your needs:

  • RHEL 7

  • CentOS 7

RHEL 7 Based Image

The RHEL 7 image is available through Red Hat’s subscription registry via:

$ docker pull registry.access.redhat.com/openshift3/ruby-20-rhel7

CentOS 7 Based Image

This image is available on DockerHub. To download it:

$ docker pull openshift/ruby-20-centos7

To use these images, you can either access them directly from these image registries, or push them into your OpenShift Docker registry. Additionally, you can create an image stream that points to the image, either in your Docker registry or at the external location. Your OpenShift resources can then reference the ImageStream. You can find example ImageStream definitions for all the provided OpenShift images.

Configuration

The Ruby image supports a number of environment variables which can be set to control the configuration and behavior of the Ruby runtime.

To set these environment variables, you can place them into a .sti/environment file inside your source code repository, or define them in the environment section of the BuildConfig Source Strategy definition.

Table 1. Ruby Environment Variables
Variable name Description

RACK_ENV

This variable specifies the environment within which the Ruby application is deployed; for example, production, development, or test. Each level has different behavior in terms of logging verbosity, error pages, and ruby gem installation. The application assets are only compiled if RACK_ENV is set to production; the default value is production.

RAILS_ENV

This variable specifies the environment within which the Ruby on Rails application is deployed; for example, production, development, or test. Each level has different behavior in terms of logging verbosity, error pages, and ruby gem installation. The application assets are only compiled if RAILS_ENV is set to production. This variable is set to ${RACK_ENV} by default.

DISABLE_ASSET_COMPILATION

The presence of this variable disables the process of asset compilation. Asset compilation only happens when the application runs in a production environment. Therefore, you can use this variable when assets have already been compiled.