Created
April 30, 2012 14:46
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Basic node 0.6.x cluster skeleton
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var http = require('http'); | |
var app = module.exports = http.createServer(function (req, res) { | |
res.writeHead(200, {'Content-Type': 'text/html'}); | |
res.end(); | |
}); |
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// Require the modules | |
var cluster = require('cluster'), | |
fs = require('fs'), | |
path = require('path'); | |
// Production flag | |
var isProduction = process.env.NODE_ENV == 'production'; | |
/* CLUSTER */ | |
// Current PID path (expects a directory under root named pids) | |
var PIDS = path.join(__dirname, 'pids'); | |
// Clear all PIDs | |
function clearPids() { | |
var filenames = fs.readdirSync(PIDS); | |
for (var i = 0, len = filenames.length; i < len; ++i) { | |
var filename = filenames[i]; | |
if (path.extname(filename) == '.pid') clearPid(filename); | |
} | |
}; | |
// Clear PID | |
function clearPid(pid) { | |
fs.unlinkSync(path.join(PIDS, pid)); | |
}; | |
// Write the current PID | |
function writePid() { | |
// Write the current PID | |
var filename = path.join(PIDS, cluster.isMaster ? 'master.pid' : 'worker.' + process.pid + '.pid'); | |
fs.writeFileSync(filename, process.pid, 'utf8'); | |
}; | |
// Gracefully kill workers by sending a SIGQUIT | |
function killWorkers() { | |
// Read the files in the pids folder | |
var filenames = fs.readdirSync(PIDS); | |
for (var i = 0, len = filenames.length; i < len; ++i) { | |
var filename = filenames[i]; | |
if (filename.substring(0, 7) == 'worker.' && path.extname(filename) == '.pid') { | |
// READ the PID and send a SIGQUIT | |
var pid = fs.readFileSync(path.join(PIDS, filename)); | |
if (pid && pid != '') process.kill(pid, 'SIGQUIT'); | |
} | |
} | |
}; | |
/* APPLICATION LOGIC */ | |
// Check if master or worker | |
if (isProduction && cluster.isMaster) { | |
// Clear all PIDs | |
clearPids(); | |
// Write the current PID | |
writePid(); | |
// Register restart handler | |
process.on('SIGUSR2', killWorkers); | |
// Reload worker on death | |
cluster.on('death', function(worker) { | |
console.log('Worker ' + worker.pid + ' died... restarting'); | |
// Clear the PID file | |
clearPid('worker.' + worker.pid + '.pid'); | |
cluster.fork(); | |
}); | |
// Create a workers per CPU | |
for (var i = 0, count = require('os').cpus().length; i < count; ++i) { | |
cluster.fork(); | |
} | |
} else { | |
if (isProduction) { | |
// Write the current PID | |
writePid(); | |
console.log('Worker ' + process.pid + ' started'); | |
} else { | |
clearPids(); | |
} | |
// Create the application | |
var app = require('./app'); | |
if (isProduction) { | |
// Register restart handler | |
process.once('SIGQUIT', function() { | |
// Shutdown your application here | |
app.close() | |
process.exit(); | |
}); | |
} | |
// Start the server | |
app.listen(8000); | |
console.log("HTTP server listening on port %d", 8000); | |
} |
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Running
node server.js
will spin up the application as a single process not using cluster. RunningNODE_ENV=production node server.js
will us cluster and create one worker per CPU core.