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Specify debug port per worker #5318
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I was also following issue #130 and none of the alternatives posted there works for us. Kind of frustrated around this, so +10
Having the same issue here and it is frustrating.
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.
- added a commit that references this issue
on Aug 8, 2013 - added a commit that references this issue
on Oct 24, 2013 - added a commit that references this issue
on Mar 17, 2014 @bnoordhuis @bajtos Any plans to backport the proper to v0.10 (including the -port command line arg)?
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.
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); }In which version is this working properly?
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on Jul 27, 2026
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