diff --git a/run.js b/run.js
new file mode 100644
index 0000000..52f9f22
--- /dev/null
+++ b/run.js
@@ -0,0 +1,13 @@
+const cluster = require('express-cluster');
+const app = require('./server.js');
+
+activePort = process.env.PORT || 3000;
+
+cluster((worker) => {
+    app.listen(activePort, () => {
+        console.log('worker ' + worker.id + ' is listening on port ' + activePort);
+    });
+}, {
+    'respawn': true, // workers will restart on failure
+    'verbose': true, // logs what happens to console
+});
diff --git a/server.js b/server.js
index 7db56fc..912edb4 100644
--- a/server.js
+++ b/server.js
@@ -5,7 +5,6 @@ try {
 }
 
 const express = require('express');
-const cluster = require('express-cluster');
 const uuid = require('uuid/v4');
 const sanitize = require('sanitize-filename');
 const Canvas = require('canvas');
@@ -22,31 +21,22 @@ function composeImage(width, height, seed) {
 };
 
 const cacheTimeout = 60 * 60 * 24 * 30;
+const app = express();
 
-cluster((worker) => {
-    const app = express();
+app.get('/healthcheck', (req, res) => {
+    res.status(200).end();
+});
 
-    app.get('/healthcheck', (req, res) => {
-        res.status(200).end();
-    });
+app.get('/:width/:seed', (req, res) => {
+    let width = parseInt(req.params.width) || 400;
+    if (width > 400) width = 400;
+    const seed = sanitize(req.params.seed) || uuid();
+    const canvas = composeImage(width, width, seed);
+    const buffer = canvas.toBuffer();
+    res.set('Cache-Control', 'max-age=' + cacheTimeout);
+    res.set('Content-length', buffer.length);
+    res.type('png');
+    res.end(buffer, 'binary');
+});
 
-    app.get('/:width/:seed', (req, res) => {
-        let width = parseInt(req.params.width) || 400;
-        if (width > 400) width = 400;
-        const seed = sanitize(req.params.seed) || uuid();
-        const canvas = composeImage(width, width, seed);
-        const buffer = canvas.toBuffer();
-        res.set('Cache-Control', 'max-age=' + cacheTimeout);
-        res.set('Content-length', buffer.length);
-        res.type('png');
-        res.end(buffer, 'binary');
-    });
-
-    activePort = process.env.PORT || 3000;
-    app.listen(activePort, () => {
-        console.log('worker ' + worker.id + ' is listening on port ' + activePort);
-    });
-}, {
-    'respawn': true, // workers will restart on failure
-    'verbose': true, // logs what happens to console
-})
+module.exports = app;