Creating a basic S2I builder image

Getting started

Files and Directories

File	Required?	Description
Dockerfile	Yes	Defines the base builder image
s2i/root/local/s2i/assemble	Yes	Script that builds the application
s2i/root/local/s2i/usage	No	Script that prints the usage of the builder
s2i/root/local/s2i/run	Yes	Script that runs the application

Dockerfile

Create a Dockerfile that installs all of the necessary tools and libraries that are needed to build and run our application. This file will also handle copying the s2i scripts into the created image.

S2I scripts

assemble

Create an assemble script that will build our application, e.g.:

• build nodejs app with production dependencies

run

Create a run script that will start the application.

usage (optional)

Create a usage script that will print out instructions on how to use the image.

Make the scripts executable

Make sure that all of the scripts are executable by running chmod +x s2i/root/local/s2i/*

Create the builder image

The following command will create a builder image named s2i-openshift-alpine-nodejs based on the Dockerfile that was created previously.

docker build -t s2i-openshift-alpine-nodejs .

The builder image can also be created by using the make command since a Makefile is included.

Once the image has finished building, the command s2i usage s2i-openshift-alpine-nodejs will print out the help info that was defined in the usage script.

Create an openshift images from this s2i builder

s2i build https://github.com/davinryan/openshift-jenkins-nodejs-example.git s2i-openshift-alpine-nodejs openshift-jenkins-nodejs-example