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cluster configuration

main
Jason J. Gullickson 6 years ago
parent
commit
9b5581f839
  1. 80
      boot.js
  2. 5
      jsfs.service

80
boot.js

@ -0,0 +1,80 @@
// This script will boot server.js with the number of workers
// specified in WORKER_COUNT.
//
// The master will respond to SIGHUP, which will trigger
// restarting all the workers and reloading the app.
var cluster = require('cluster');
var workerCount = process.env.WORKER_COUNT || 4;
// Defines what each worker needs to run
cluster.setupMaster({ exec: 'server.js' });
// Gets the count of active workers
function numWorkers() { return Object.keys(cluster.workers).length; }
var stopping = false;
// Forks off the workers unless the server is stopping
function forkNewWorkers() {
if (!stopping) {
for (var i = numWorkers(); i < workerCount; i++) { cluster.fork(); }
}
}
// A list of workers queued for a restart
var workersToStop = [];
// Stops a single worker
// Gives 60 seconds after disconnect before SIGTERM
function stopWorker(worker) {
console.log('stopping', worker.process.pid);
worker.disconnect();
var killTimer = setTimeout(function() {
worker.kill();
}, 60000);
// Ensure we don't stay up just for this setTimeout
killTimer.unref();
}
// Tell the next worker queued to restart to disconnect
// This will allow the process to finish it's work
// for 60 seconds before sending SIGTERM
function stopNextWorker() {
var i = workersToStop.pop();
var worker = cluster.workers[i];
if (worker) stopWorker(worker);
}
// Stops all the works at once
function stopAllWorkers() {
stopping = true;
console.log('stopping all workers');
for (var id in cluster.workers) {
stopWorker(cluster.workers[id]);
}
}
// Worker is now listening on a port
// Once it is ready, we can signal the next worker to restart
cluster.on('listening', stopNextWorker);
// A worker has disconnected either because the process was killed
// or we are processing the workersToStop array restarting each process
// In either case, we will fork any workers needed
cluster.on('disconnect', forkNewWorkers);
// HUP signal sent to the master process to start restarting all the workers sequentially
process.on('SIGHUP', function() {
console.log('restarting all workers');
workersToStop = Object.keys(cluster.workers);
stopNextWorker();
});
// Kill all the workers at once
process.on('SIGTERM', stopAllWorkers);
// Fork off the initial workers
forkNewWorkers();
console.log('app master', process.pid, 'booted');

5
jsfs.service

@ -1,6 +1,7 @@
[Service]
WorkingDirectory=/var/www/jsfs
ExecStart=/usr/local/bin/node server.js
ExecStart=/usr/local/bin/node boot.js
ExecReload=/bin/kill -HUP $MAINPID
Restart=always
StandardOutput=syslog
StandardError=syslog
@ -8,6 +9,6 @@ SyslogIdentifier=jsfs
User=web
Group=web
Environment='NODE_ENV=production'
[Install]
WantedBy=multi-user.target

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