# CF-AutoScaler

This is an incubation project for Cloud Foundry. You can follow the development progress on [Pivotal Tracker][t].

The CF-AutoScaler provides the capability to adjust the computation resources for CloudFoundry applications through

• Dynamic scaling based on application performance metrics
• Scheduled scaling based on time

The CF-AutoScaler is provided as a Cloud Foundry service offering. Any application bound with CF-AutoScaler service will be able to use it.

Quick Start

System requirements:

• Java 7 or above
• [Apache Maven][b] 3
• [Apache couchdb][c]
• cf command line version 6

Database requirement:

The CF-AutoScaler uses Apache couchdb as the backend data store. You can have your own database installation from [here][c] or use an exisiting couchdb service, for example [Cloudant][e]

Requirements of Cloudfoudry access:

• To register CF-AutoScaler service, you need a valid Cloudfoundry UAA user id.
• CF-AutoScaler will invoke Cloud controller API to trigger scaling on target application. To achieve this, a UAA client id with authorities cloud_controller.read,cloud_controller.admin is needed. You can create it using UAA command line tool:

uaac target https://uaa.<cf-domain>
uaac token client get admin -s <cf uaa admin secret> 
uaac client add cf-autoscaler-client \
    --authorized_grant_types client_credentials \
    --authorities cloud_controller.read,cloud_controller.admin \
    --secret cf-autoscaler-client-secret

Then you can start with cloning this project:

    $ git clone git://github.com/cfibmers/open-Autoscaler
    $ cd open-Autoscaler

The CF-AutoScaler is offered as an Java Web Application. You need the following steps to get it running.

• Package CF-AutoScaler with Maven
• Launch CF-AutoScaler runtime
• Register CF-AutoScaler service broker on CloudFoundry

The script ./bin/getStart.sh will help you to complete all these steps. The manual guide is also listed as below.

Package with Maven

The AutoScaler has three components, all of them are Java Web Application:

• api : provides public APIs to manage scaling policy, retrive application metrics and scaling history. See details in [API_usage.rst][a]
• servicebroker: implements the [Cloudfoundry service broker API] (http://docs.cloudfoundry.org/services/api.html) to offer CF-AutoScaler as a service.
• server: the backend engine of CF-AutoScaler

All these 3 components are configured through Maven profiles. You need to create your own profile according to your runtime environment, and then package the projects to .war file. Here is an example:

• Assuming you are using "sample" profile, edit the properties in {project}/profiles/sample.properties for api , servicebroker, server
• Run mvn clean package -Psample -DskipTests to create *.war file which would be found in folder {project}/target

Deploy and Run

As an Java web application, you can launch the components of CF-AutoScaler with Tomcat directly or push to CloudFoundry.

Please note the runtime environment must use the below settings you configured in servicebroker/profiles/{profile}.properties.

serverURIList=AutoScaling.bosh-lite.com
apiServerURI=AutoScalingAPI.bosh-lite.com

If you launch CF-AutoScaler with Tomcat server in Eclispe & plugin [M2eclipse][d], the following steps will help you to enable your customized configuration :

1. Run mvn eclipse:eclipse -Dwtpversion=2.0 for each projects
2. Activate <profile> in eclipse by Right-click the project -> Properties -> Maven -> Fill in the <profile> name you want to activate.

Register CF-AutoScaler service broker

You can register CF-AutoScaler with command:

cf create-service-broker CF-AutoScaler brokerUserName brokerPassword brokerURI
cf enable-service-access CF-AutoScaler

Use CF-AutoScaler

Now, you can play with CF-AutoScaler.

Firstly create a CF-AutoScaler service, and bind to you application

cf create-service CF-AutoScaler free <service_instance>
cf bind-service <app> <service_instance>

Then define scaling policy using the APIs described in [API_usage.rst][a]

License

This project is released under version 2.0 of the [Apache License][l]. [a]: https://github.com/cfibmers/open-Autoscaler/blob/master/docs/API_usage.rst [b]: https://maven.apache.org/ [c]: http://couchdb.apache.org/ [d]: http://www.eclipse.org/m2e/ [e]: http://www.cloudant.com [l]: LICENSE [t]: https://www.pivotaltracker.com/projects/1566795