node.js - Add worker to PM2 pool. Don't reload/restart existing workers -

env.: node.js on ubuntu, using pm2 programmatically.

i have started pm2 3 instances via node on main code. suppose use pm2 command line delete 1 of instances. can add worker pool? can done without affecting operation of other workers?

i suppose should use start method:

pm2.start({  name : 'worker',  script    : 'api/workers/worker.js',         // script run  exec_mode : 'cluster',        // or fork  instances : 1,                // optional: scale app 4  max_memory_restart : '100m',   // optional: restart app if reaches 100mo  autorestart : true  }, function(err, apps) {  pm2.disconnect();  }); 

however, if use pm2 monit you'll see 2 existing instances restarted , no other created. result still 2 running instances.

update doesn't matter if cluster or fork -- behavior same.

update 2 command line has scale option ( https://keymetrics.io/2015/03/26/pm2-clustering-made-easy/ ), don't see method on programmatic api documentation ( https://github.com/unitech/pm2/blob/master/advanced_readme.md#programmatic-api ).

i think can't done in pm2 have exact same problem.

i'm sorry, think solution use else pm2 limited. lack of ability add more workers deal breaker me.

i know can "scale" on command line if using clustering have no idea why can not start more instances if using fork. makes no sense.