Lcrowther-pivotal / cf-bg-demo

Demonstrate Blue-Green Deployments on Cloud Foundry with this simple (one Groovy file, one HTML file) Spring Boot CLI application!

cf-bg-demo

Demonstrate Blue-Green Deployments on Cloud Foundry with this simple (one Groovy file, one HTML file) Spring Boot CLI application!

Running Locally

• Install the latest Spring Boot CLI.

• Run:

$ spring run app.groovy

Running on Cloud Foundry

The application requires the latest version of the Java Buildpack, so we’ll use that from GitHub.

$ cf push -m 512M -b https://github.com/cloudfoundry/java-buildpack cf-scale-boot

Doing a Blue-Green Demo

This application leverages the colors blue and green to demonstrate the dynamic routing and load balancing capabilities of Cloud Foundry in a Blue-Green Deployment Scenario.

Steps:

1. Push the application as-is, with blue appended to the application name:

   $ cf push -m 512M -b https://github.com/cloudfoundry/java-buildpack cf-bg-demo-blue

2. Map a ``zero downtime'' route to the application:

   cf map-route cf-bg-demo-blue cfapps.io -n cf-bg-demo

   Visit your application in the browser using your zero downtime route to see that it is working.

3. Modify app.groovy to use the color green (line 8):

   model['color'] = 'green'

4. Push the modified application, with green appended to the application name:

   $ cf push -m 512M -b https://github.com/cloudfoundry/java-buildpack cf-bg-demo-green

5. Map the ``zero downtime'' route to the modified application:

   cf map-route cf-bg-demo-green cfapps.io -n cf-bg-demo

   Visit your application in the browser using your zero downtime route to see that the platform is load balancing between the two instances.

6. Un-map the ``zero downtime'' route from the original application:

   cf unmap-route cf-bg-demo-blue cfapps.io -n cf-bg-demo

   Visit your application in the browser using your zero downtime route to see that only the modified application is now in play.

What you get: