Specify debug port per worker

[pavele]

Hi,
Currently it looks impossible to debug worker processes. Here is a discussion related with node-inspector:
node-inspector/node-inspector#130

Is it possible to add ability to change the debug ports for the workers?

Thanks

[IvanTorresEdge]

I was also following issue #130 and none of the alternatives posted there works for us. Kind of frustrated around this, so +10

[chestone]

Having the same issue here and it is frustrating.

[bnoordhuis]

We'll address that in due time. The cluster module is scheduled for rework anyway. Until then, you can use something like this:

var cluster = require('cluster');
var http = require('http');

if (cluster.isMaster) {
  var debug = process.execArgv.indexOf('--debug') !== -1;
  cluster.setupMaster({
    execArgv: process.execArgv.filter(function(s) { return s !== '--debug' })
  });
  for (var i = 0; i < 2; ++i) {
    if (debug) cluster.settings.execArgv.push('--debug=' + (5859 + i));
    cluster.fork();
    if (debug) cluster.settings.execArgv.pop();
  }
}
else {
  var server = http.createServer(function(req, res) {
    res.end('OK');
  });
  server.listen(8000);
}

It's improper use of the API (cluster.settings should be considered immutable) but this snippet works with v0.10.

[benfleis]

@bnoordhuis @bajtos Any plans to backport the proper to v0.10 (including the -port command line arg)?

[indutny]

@benfleis that would be a behavior change, I think. This could be done only in unstable branches.

[benfleis]

@indutny Makes sense. Thanks :)

[Redsandro]

I think a similar problem is happening when using child.fork() when the parent is already using --debug.

Failed to open socket on port 5858, waiting 1000 ms before retrying

I guess we can override this using arguments, but the documentation is not opening my eyes yet.

[Redsandro]

Workaround, something like this before you fork():

var debugArgIdx = process.execArgv.indexOf('--debug');
if (debugArgIdx !== -1) {
    // Remove debugging from forked process
    process.execArgv.splice(debugArgIdx, 1);
}

[srlowe]

In which version is this working properly?