diff --git a/.env.example b/.env.example
index 3e0d362..8f6bf2e 100644
--- a/.env.example
+++ b/.env.example
@@ -1 +1,2 @@
-TARGET='url del servidor local'
\ No newline at end of file
+TARGET='url del servidor local'
+PORT='puerto de acceso'
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 073fe63..4f8c079 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,3 +30,5 @@ COPY \
     index.html \
     clockIn.html \
     ./
+
+CMD ["node", "proxy.js"]
\ No newline at end of file
diff --git a/proxy.js b/proxy.js
index 3d3085b..30f546f 100644
--- a/proxy.js
+++ b/proxy.js
@@ -12,7 +12,7 @@ const apiProxy = createProxyMiddleware('/api', {
 app.use('/api', apiProxy);
 app.use('/', express.static(__dirname));
 
-const port = 4000;
+const port = process.env.PORT;
 app.listen(port, () => {
   console.log(`Server running on port: ${port}`);
 });