Configuration Files

Outline

An application (let’s call it MyApp) should provide 3 directories.

descriptor/ contains the main Roboconf configuration file, application.properties.
This file describes the application it self (name, description, location of the main model files…).

graph/ contains at least one .graph file (whose name is specified in application.properties).
Graph files list components and their dependencies (components can be Software components to install, or VMs to deploy on). graph/ also contains one sub-directory for each component listed in the graph model. This sub-directory must contain all the files necessary to deploy the component (e.g. scripts, Software packages, configuration files…)

instances/ contains an .instances file (whose name is specified in application.properties).
This file lists all the initial instances. It means graph components will be pre-instantiated, ready to be deployed.

MyApp/
├── descriptor
│   └── application.properties (main Roboconf configuration file)
├── graph
│   ├── *.graph file (describes components and their dependencies)
│   ├── One directory for each component...
└── instances
	└── *.instances (declares instances of components)

Example

Let’s assume you wish to deploy an application called MyApp, using bash scripts, on EC2 and OpenStack IaaS.
Roboconf configuration files should be organized as follows:

MyApp/
├── descriptor
│   └── application.properties
├── graph
│   ├── main.graph
│   ├── VM_EC2
│   │   └── target.properties
│   ├── VM_Openstack
│   │   └── target.properties
│   └── MyApp
│       ├── files
│       └── script
│           ├── deploy.sh
│           ├── start.sh
│           ├── stop.sh
│           └── update.sh
└── instances
    └── model.instances

Content of application.properties:

# Application Descriptor for Roboconf
application-name = MyApp
application-qualifier = sample
application-description = A sample application

application-dsl-id = roboconf-1.0

graph-entry-point = main.graph
instance-entry-point = model.instances

Content of main.graph:

# My app to deploy on the IaaS
MyApp {
	installer: bash;
	exports: ip;
}

# The VMs where to deploy the Wall application
VM_EC2 {
	installer: target;
	children: MyApp;
}
    
VM_Openstack {
	installer: target;
	children: MyApp;
}

Content of model.instances:

# Deploy on EC2 VM (called VM1)
instance of VM_EC2 {
	name: VM1;
	instance of MyApp {
		name: MyApp_on_EC2;
	}
}
    
# Deploy on Openstack VM (called VM2)
instance of VM_Openstack {
	name: VM2;
	instance of MyApp {
		name: MyApp_on_Openstack;
	}
}

Content of VM_EC2/target.properties:

# These properties are specific to Amazon Web Services
target.id          = ec2
ec2.endpoint       = eu-west-1.ec2.amazonaws.com
ec2.access.key     = YOUR_EC2_ACCESS_KEY
ec2.secret.key     = YOUR_EC2_SECRET_KEY
ec2.ami            = Your AMI identifier (ami-...)
ec2.instance.type  = t1.micro
ec2.ssh.key        = Your SSH Key
ec2.security.group = Your Security Group