diff --git a/Dockerfile b/Dockerfile
index ca63a75..2776f2e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,17 @@
+# Use the official NGINX image as a parent image
 FROM nginx:alpine
-COPY nginx.conf /etc/nginx/nginx.conf.template
-COPY docker-entrypoint.sh /docker-entrypoint.sh
-RUN chmod +x /docker-entrypoint.sh
-ENTRYPOINT ["/docker-entrypoint.sh"]
\ No newline at end of file
+
+# Set environment variables with default values
+ENV BACKEND_HOST=localhost
+ENV BACKEND_TCP_PORT=80
+ENV BACKEND_UDP_PORT=12345
+
+# Copy the script and configuration template into the container
+COPY entrypoint.sh /entrypoint.sh
+COPY nginx.conf.template /etc/nginx/nginx.conf.template
+
+# Make the script executable
+RUN chmod +x /entrypoint.sh
+
+# Use the script as the entrypoint
+ENTRYPOINT ["/entrypoint.sh"]