The following command will create a builder image named golang-centos7.
docker build -t golang-centos7 .
The builder image can be tested using the following commands:
docker build -t golang-centos7-candidate .
IMAGE_NAME=golang-centos7-candidate test/run
The application image combines the builder image with your applications source code, which is served using whatever application is installed via the Dockerfile, compiled using the assemble script, and run using the run script. The following command will create the application image:
s2i build test/test-app golang-centos7 golang-centos7-app
Using the logic defined in the assemble script, s2i will now create an application image using the builder image as a base and including the source code from the test/test-app directory.
Running the application image is as simple as invoking the docker run command:
docker run -d -p 8080:8080 golang-centos7-app
The application, which consists of a simple static web page, should now be accessible at http://localhost:8080.
The following command will create a builder image named golang-centos7.
$ oc new-build https://github.com/nmasse-itix/golang-s2i.git --name=golang-centos7
$ oc logs -f bc/golang-centos7
The application image combines the builder image with your applications source code, which is served using whatever application is installed via the Dockerfile, compiled using the assemble script, and run using the run script. The following command will create the application image and run it:
$ oc new-app --strategy=source --context-dir=test/test-app --name golang-centos7-app golang-centos7~https://github.com/nmasse-itix/golang-s2i.git
$ oc logs -f bc/golang-centos7-app
Using the logic defined in the assemble script, s2i will now create an application image using the builder image as a base and including the source code from the test/test-app directory.
Creating a route for the application is needed to use it :
$ oc expose service golang-centos7-app
$ oc get route golang-centos7-app
The application, which consists of a simple static web page, should now be accessible at the url shown on last command (oc get route) :
$ curl "http://$(oc get route golang-centos7-app |awk '$1 == "golang-centos7-app" {print $2}')/"
File | Required? | Description |
---|---|---|
Dockerfile | Yes | Defines the base builder image |
s2i/bin/assemble | Yes | Script that builds the application |
s2i/bin/usage | No | Script that prints the usage of the builder |
s2i/bin/run | Yes | Script that runs the application |
s2i/bin/save-artifacts | No | Script for incremental builds that saves the built artifacts |
test/run | No | Test script for the builder image |
test/test-app | Yes | Test application source code |
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.
Create an assemble script that will build our application, e.g.:
- build python modules
- bundle install ruby gems
- setup application specific configuration
The script can also specify a way to restore any saved artifacts from the previous image.
Create a run script that will start the application.
Create a save-artifacts script which allows a new build to reuse content from a previous version of the application image.
Create a usage script that will print out instructions on how to use the image.