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respawn

Spawn a process and restart it if it crashes.

npm install respawn

Usage

It is easy to use

var respawn = require('respawn')

var monitor = respawn(['node', 'server.js'], {
  env: {ENV_VAR:'test'}, // set env vars
  cwd: '.',              // set cwd
  maxRestarts:10,        // how many restarts are allowed within 60s
                         // or -1 for infinite restarts
  sleep:1000,            // time to sleep between restarts,
  kill:30000,            // wait 30s before force killing after stopping
  stdio: [...]           // forward stdio options
})

monitor.start() // spawn and watch

Optionally you can specify the command to to spawn in the option map as command: [...]

API

• monitor.start() Starts the monitor

• monitor.stop(cb) Stops the monitor (kills the process if its running with SIGTERM)

• monitor.status Get the current monitor status. Available values are running, stopping, stopped, crashed and sleeping

Events

• monitor.on('start') The monitor has started

• monitor.on('stop') The monitor has fully stopped and the process is killed

• monitor.on('crash') The monitor has crashed (too many restarts or spawn error).

• monitor.on('sleep') monitor is sleeping

• monitor.on('spawn', process) New child process has been spawned

• monitor.on('exit', code, signal) child process has exited

• monitor.on('stdout', data) child process stdout has emitted data

• monitor.on('stderr', data) child process stderr has emitted data

• monitor.on('warn', err) child process has emitted an error

Graceful restart

To do graceful restart simply have your app stop gracefully when receiving SIGTERM and do

// graceful restart (do not wait for old process to die)
monitor.stop()
monitor.start()

// hard restart (wait for old process to die)
monitor.stop(function() {
  monitor.start()
})

License

MIT