How to detach (deamonize) master process correctly?

[ybogdanov]

Hi,

nohup is good, but it kills the process at the end of session. I use capistrano to run commands on remote servers, e.g. start/stop/restart clusterized processes.

The quesion: what is the best way to start cluster process remotely and bring it to background?

Thanks!

[ybogdanov]

Temporarily, I spawn new process in new session:

var start = process.argv[process.argv.length - 1] === 'start';

if (start) {
    var node = process.execPath,
        cmd = process.argv.slice(1, -1);

    spawn(node, cmd, { env : process.env, setsid: true });
    process.exit(0);
}

// require, initialize, start cluster here...

And then $ myapp.js start

[tj]

yeah to achieve similar right now we would have to pretty much do exactly what you're doing

[ybogdanov]

Ok, thanks!

[alefnula]

Just a suggestion: maybe adding a command to cli? Something like this?

define('-b, --background, background', function(master) {
  master.on('listening', function () {
    master.killall('SIGUSR2');      
  });
}, 'Start master in background');

The only problem is the part:

90  if (~command.flags.indexOf(arg)) {
91    command.callback(master);
92    process.exit(0);
93  }

Because the process exists. Maybe adding a switch to command exit_after or checking the return value do_exit = command.callback(master)

[tj]

@alefnula yeah i know i have that there for a reason but ill see if i can use the preventDefault() stuff i added a while back

[alefnula]

I'm sure there is a much better way of doing it :) It was just the first thing I found that could work after a quick look at the code. But thanks for taking the cli background suggestion into account :)