Blue-Green deployment across multiple clouds

The main purposes here is to demonstrate Blue-Green deployment of Articulate application across two clouds. This tutorial can be easily expanded to include Atendee services as part of the deployment and also scale it to more than 2 clouds. Follow the steps below for setup and execution of this tutorial.

Setup concourse locally

1. Setup Concourse locally by following Getting Started section in https://concoursetutorial.com/
2. Mirror this repository to your account as explained in https://help.github.com/articles/duplicating-a-repository/
3. Clone your newly created repository to your local desktop / laptop by executing the git clone command

$ git clone https://<<your-repo>>/pcf101-articulate-attendee.git

4. Edit vars.yml file under articulate\ci folder and update the following variables to point to your cloud instances

pcf-api: api.sys.pcf.aws.pcfjourney.com
pcf-username: admin
pcf-password: xxxxxxxxxxxxx
pcf-domain: apps.pcf.aws.pcfjourney.com
pcf-organization: UT
pcf-space: dev
...
cloud2-pcf-api: api.run.haas-90.pez.pivotal.io
cloud2-pcf-username: admin
cloud2-pcf-password: xxxxxxxxxxxx
cloud2-pcf-domain: cfapps.haas-90.pez.pivotal.io
cloud2-pcf-organization: UT
cloud2-pcf-space: dev

5. Edit pipeline.yml file under articulate/ci folder and modify the resources section to point to your github repo

# GIT
- name: resource-git
  type: git
  source:
    uri: https://github.com/<<your repo>>/pcf101-articulate-attendee
    branch: master

6. Install pipeline using the following command from the project root directory

fly -t tutorial set-pipeline -p <<pipeline-name>> -c articulate/ci/pipeline.yml -l articulate/ci/vars.yml

7. Naviage to the pipleine UI (http://127.0.0.1:8080/teams/main/pipelines/ <> )and trigger a build by clicking on + sign on "build and deploy" task page as shown below

8. You can see blue-articulate application deployed on two clouds.

9. Navigate to Blue-Green page, you can see the cloud name highlighted in green. The logic for the cloud name display is based on pcf-api variable in the vars.yml and is implemented in EnablementHelper.java under articulate/src/main/java/io/pivotal/education/articulate/service as shown below. Please update the logic to fit your api end-point name and cloud provider.

    //Added to check the cloud based on api - Ahilan
   String cloudName = (String) getVcapApplicationMap().get("cf_api");
   if (cloudName.equals("https://api.sys.pcf.aws.pcfjourney.com")) {
     cloudName = "AWS";
   }else{
     cloudName = "vSphere";
   }
   

10. Start the counter in both clouds so that you can see the blue-green action in real time.
11. Edit layout.html under templates/fragments folder and un-comment the following lines

 <li><img
          src="/images/uta.png"
          style="width: 40px; height: 40px; margin-top: -2px;"/></li>

12. Check-in the the changes, you will see new build triggered automatically and Blue-Green deployment in action in cloud1 followed by cloud 2. The following diagram shows the overall flow

Credits

This project is originated from https://github.com/pivotal-education/pcf-articulate-code