Building a Docker Image and Deploying a Pre-Packaged App

Prerequisites

• Java 8

• Docker installed locally (https://docs.docker.com/docker-for-windows/install/ (opens new window))

• maven

• Access to a docker repository (docker.io or other)

Introduction

This tutorial will show you how you can use an Entando application that you have built as a launching point for creating new applications.

In this lab you’ll take a demo application previously built, install the backups in a blank application, build an image from the updated app, and deploy it as a new application.

Setup

1. Clone the application at: https://github.com/entando/entando-de-app (opens new window) using

   git clone https://github.com/entando/entando-de-app
   

2. On a command line, cd into the entando-de-app you just cloned:

   cd entando-de-app
   

3. Take the provide zip file and unzip it in a location of your choice.

   • This zip contains all of the assets, content, and metadata needed to launch an Entando application. We are going to package them the assets and DB an image and

   • Entando will automatically instantiate and populate the app from the most recent backup

4. Move the resources and protected folders from the zip file into your entando-de-app in src/main/webapp replacing any content that is already there

5. Build a docker image from the app

   mvn clean package -Pwildfly -Pderby docker:build
   

   • Note that the "derby" option here is only for the initialization phase of the DB when deploying. It isn’t the final database choice

6. View the images installed on your local docker instance

   docker images
   

   Look for

   entando/entando-de-app:latest
   

7. Create a repository on your docker repository to house your new application

8. Re-tag the image you just built with your repo

    docker tag entando/entando-de-app:latest <YOUR-USER>/<YOUR-REPO_NAME>:latest
   

9. Push the Image to your Repository

   docker push <YOUR-USER>/<YOUR-REPO_NAME>:latest
   

10. Now we need to generate a new application for deployment to Kubernetes using the helm chart

    • If you have an output from helm from before you can re-use it and just apply the changes to the config map.

    • Or you can re-run helm and change the output

11. Re-run the helm command for your environment (check with your instructor if you don’t know what this is)

12. Open the output yaml file from the helm command in the text editor of your choice

    • For example: vi training-alpha.yaml

13. In that file look for the ConfigMap

    • The config map defines all of the images that are available as part of the deployment. They aren’t all used concurrently.

    • You can also view this config map in kubernetes/OpenShift

14. Now you need to update the deployment to use your customized Wildfly image. Find entando-de-app-wildfly in the config map

    • Note that we are changing the de-app but you could create a custom version of any of the included images

15. Change the version to match the version you used for your image

16. Change the "organization" to the name of your main image repository organization and if you aren’t using docker.io (DockerHub) then change the registry as well.

17. Save the file

18. Follow the deployment steps you went through when you originally deployed your Entando application to your Kubernetes instance

19. Once deployed go to the app builder in your app

20. Click Go To Homepage