env added

.dockerignore

+node_modules
+Dockerfile
+.dockerignore
\ No newline at end of file

.env

+PORT = 3000
\ No newline at end of file

.gitignore

 node_modules
\ No newline at end of file
-.env
\ No newline at end of file

docker.compose.yaml

+version: "3.8"
+services: 
+  app_server:
+    container_name: app_server
+    image: app_server:1.0.0
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    command: npm run start
+    env_file: .env
+    ports: '3000:3000'
\ No newline at end of file

dockerfile

+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy package.json and package-lock.json first (this leverages Docker cache for better efficiency)
+COPY package.json .
+COPY package-lock.json .
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the application code
+COPY . .
+
+# Copy .env file if necessary for environment variables
+COPY .env .env
+
+# Expose the application port
+EXPOSE 3000
+
+# Command to run the application
+CMD ["npm", "start"]
+
+# Optionally, add a health check
+# HEALTHCHECK CMD curl --fail http://localhost:3000/ || exit 1

index.js

@@ -9,5 +9,5 @@ app.get('/', (req,res)=>{
 });
 
 app.listen(PORT, ()=>{
-    console.log(`Listening to http://localhost:3001`);
+    console.log(`Listening to http://localhost:${PORT}`);
 })
\ No newline at end of file