cluster.setupMaster()

cluster.setupMaster([settings])

settings <Object>
- exec <String> file path to worker file. (Default=process.argv[1])
- args <Array> string arguments passed to worker. (Default=process.argv.slice(2))
- silent <Boolean> whether or not to send output to parent's stdio. (Default=false)

setupMaster is used to change the default 'fork' behavior. Once called, the settings will be present in cluster.settings.

Note that:

any settings changes only affect future calls to .fork() and have no effect on workers that are already running
The only attribute of a worker that cannot be set via .setupMaster() is the env passed to .fork()
the defaults above apply to the first call only, the defaults for later calls is the current value at the time of cluster.setupMaster() is called

Example:

const cluster = require('cluster');
cluster.setupMaster({
  exec: 'worker.js',
  args: ['--use', 'https'],
  silent: true
});
cluster.fork(); // https worker
cluster.setupMaster({
  exec: 'worker.js',
  args: ['--use', 'http']
});
cluster.fork(); // http worker

This can only be called from the master process.

Links:

https://nodejs.org/dist/latest-v5.x/docs/api/cluster.html#cluster_cluster_setupmaster_settings

doc_Nodejs

2025-01-10 15:47:30

Comments