Deploy Spring Music

These instructions will walk you through deploying the Cloud Foundry Spring Music reference App with Kf, demonstrating a few things along the way:

Building Java Apps from source: The Spring Music source will be built on the cluster, not locally.
Service broker integration: You will create and bind a PostgreSQL database to the Spring Music App.
Spring Cloud Connectors: Spring Cloud Connectors are used by the Spring Music App to detect things like bound CF services. They work seamlessly with Kf.
Configuring the Java version: You will specify the version of Java you want the buildpack to use.

Prerequisites

Option 1: Minibroker

The cluster administrator should follow these instructions to install the Minibroker service broker into your cluster. Minibroker will allow you to provision a PostgreSQL database and configure your App to use it.

To confirm that Minibroker is installed and available to your cluster, run kf marketplace and you should see output similar to:

$ kf marketplace
5 services can be used in Space "demo", use the --service flag to list the plans for a service

Broker      Name        Space      Status  Description
minibroker  mariadb                Active  Helm Chart for mariadb
minibroker  mongodb                Active  Helm Chart for mongodb
minibroker  mysql                  Active  Helm Chart for mysql
minibroker  postgresql             Active  Helm Chart for postgresql
minibroker  redis                  Active  Helm Chart for redis

Option 2: Other Service Broker

You can use a different service broker that's installed as long as it supports creating PostgreSQL services. For example, the gcp-service-broker.

Deploy

Clone source

Clone the Spring Music repo.

git clone https://github.com/cloudfoundry-samples/spring-music.git spring-music
cd spring-music

Edit manifest.yml, and replace the contents with the following:

---
applications:
- name: spring-music
  memory: 1G
  random-route: true
  stack: org.cloudfoundry.stacks.cflinuxfs3
  env:
    BP_AUTO_RECONFIGURATION_ENABLED: false

Push App

Deploy (this assumes you've already kf targeted a Space; see these docs for more detail):
```
kf push spring-music
```
Use the proxy feature to access the deployed App, then load http://localhost:8080 in your browser:
```
kf proxy spring-music
```
The deployed App includes a UI element showing which (if any) Spring profile is being used. No profile is being used here, indicating an in-memory database is in use.

Create and bind database

Create a PostgreSQL service via the broker installed in the marketplace:

kf create-service postgresql 11-7-0 spring-music-db -c '{"postgresqlDatabase":"smdb", "postgresDatabase":"smdb"}'

Bind the service instance to the Spring Music App:

kf bind-service spring-music spring-music-db -c '{"postgresqlDatabase":"smdb", "postgresDatabase":"smdb"}'

Restart the App to make the service binding available via the VCAP_SERVICES environment variable:
```
kf restart spring-music
```
(Optional) View the binding details:
```
kf bindings
```
kf proxy to the App again and view it in your web browser. The Spring profile should be shown, indicating the PostgreSQL service you created and bound is being used:

Destroy

Unbind and delete the PostgreSQL service:

kf unbind-service spring-music spring-music-db
kf delete-service spring-music-db

Delete the App:
```
kf delete spring-music
```