added npm stop to exit cluster

bin/cluster

@@ -1,17 +1,36 @@
 var cluster = require('cluster');
+var fs = require('fs');
 
 if (cluster.isMaster) {
-  // Count the machine's CPUs
-  var cpuCount = require('os').cpus().length;
+  fs.writeFile('./tmp/cluster.pid', process.pid, function (err) {
+    if (err) {
+      console.log('Error: unable to create cluster.pid');
+      process.exit(1);
+    } else {
+      console.log('Starting cluster with pid: ' + process.pid);    
+      //ensure workers exit cleanly 
+      process.on('SIGINT', function() {
+        console.log('Cluster shutting down..');
+        for (var id in cluster.workers) {
+          cluster.workers[id].kill();
+        }
+        // exit the master process
+        process.exit(0);
+      });
 
-  // Create a worker for each CPU
-  for (var i = 0; i < cpuCount; i += 1) {
-    cluster.fork();
-  }
+      // Count the machine's CPUs
+      var cpuCount = require('os').cpus().length;
 
-  // Listen for dying workers
-  cluster.on('exit', function () {
-    cluster.fork();
+      // Create a worker for each CPU
+      for (var i = 0; i < cpuCount; i += 1) {
+        cluster.fork();
+      }
+
+      // Listen for dying workers
+      cluster.on('exit', function () {
+        cluster.fork();
+      });
+    }
   });
 } else {
   require('./instance');

bin/instance

@@ -65,6 +65,5 @@ db.connect(dbString, function() {
 
   var server = app.listen(app.get('port'), function() {
     debug('Express server listening on port ' + server.address().port);
-    console.log('Ready to receive connections on port: ' + server.address().port);
   });
 });

package.json

@@ -4,6 +4,7 @@
   "private": true,
   "scripts": {
     "start": "node --stack-size=10000 ./bin/cluster",
+    "stop": "kill -2 $(cat tmp/cluster.pid)",
     "test": "node ./node_modules/jasmine/bin/jasmine.js"
   },
   "dependencies": {