I\'ve got some code that looks very much like the sample in the Cluster documentation at http://nodejs.org/docs/v0.6.0/api/cluster.html, to wit:
var cluster
if you use VSCode to debug, you need to specify the port and and "autoAttachChildProcesses": true in the lanuch.json file.
"autoAttachChildProcesses": true
If you debug directly in DevTool, you need to add a connection to the corresponding port in the console.