Java Autoscaler

Simple Restfull Cloud Foundry Appplication Autoscaler written in Spring/Java

Prerequisites

1. Cloud Foundry installation
2. An AMQP service installed named rabbit (This can be changed by altering the manifest.yml under services)
3. A queue enabled on the AMPQ service

Usage

1. Download/clone the project
2. Edit the src/main/resources/application.properties file to match your Cloud Foundry and queue information
3. Run the maven wrapper $ ./mvn clean package
4. Push the applicaiton to Cloud Foundry $ cf push

Once the application is running on Cloud Foundry it will issue scale commands for the application defined in the application.properties file based on the current size of the queue that is defined in the properites file. There are three restfull requests to use the autoscaler.

• AUTOSCALER_HOSTNAME.CF_APP_DOMAIN/scaleup

  The autoscaler will check the depth of the queue. If that is larger than the current number of instances of the monitored application, it will scale up by the value defined in application.properties under cf.scale.

• AUTOSCALER_HOSTNAME.CF_APP_DOMAIN/scaledown

  The autoscaler will scaled the monitored application down to the default value defined in the applicaiton.properties file under cf.scalemin

• AUTOSCALER_HOSTNAME.CF_APP_DOMAIN/stop

  The autoscaler will issue a stop command to the monitored application, shutting down all running instances. This will not scale the application down. If resumed, the application will maintain it's previous number of instances.