Tutorial - Managing Apache Storm with Roboconf and Docker - 4/5

This penultimate part guides you in the creation a Roboconf command. Such a file is equivalent to creating a script with Roboconf instructions.

Roboconf commands can be sued to define complex actions…

• … executed on-demand in Roboconf’s web console.
• … whose execution is scheduled (that day, at that time…).
• … that will be executed when some criteria are met. This is what we call the (autonomic).

Upgrade your application by adding a scale-up.commands file.
This command will have to:

• Generate a new VM name.
• Create a new instance of VM.
• Create a new instance of Storm worker node.
• Deploy and start it all.

Redeploy your application, redeploy the instances and then execute your command through Roboconf’s web console. Verify a new Docker container was created and that the topology was redistributed over the Storm cluster.

It is now time to deal with the last part of this tutorial.