added Dockerfile in each service layer, so that docker-compose.yml can create docker images of these services in one go

Author: Yash-vs9

api-gateway/Dockerfile

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+# 1. Use an official Java runtime as a parent image
+FROM eclipse-temurin:17-jdk-alpine
+
+# 2. Set the working directory inside the container
+WORKDIR /app
+
+# 3. Copy the compiled jar file into the container
+# We use a wildcard (*.jar) so you don't have to worry about version numbers
+COPY target/*.jar app.jar
+
+# 4. Run the jar file
+ENTRYPOINT ["java", "-jar", "app.jar"]

booking-service/Dockerfile

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+# 1. Use an official Java runtime as a parent image
+FROM eclipse-temurin:17-jdk-alpine
+
+# 2. Set the working directory inside the container
+WORKDIR /app
+
+# 3. Copy the compiled jar file into the container
+# We use a wildcard (*.jar) so you don't have to worry about version numbers
+COPY target/*.jar app.jar
+
+# 4. Run the jar file
+ENTRYPOINT ["java", "-jar", "app.jar"]

discovery-server/Dockerfile

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+# 1. Use an official Java runtime as a parent image
+FROM eclipse-temurin:17-jdk-alpine
+
+# 2. Set the working directory inside the container
+WORKDIR /app
+
+# 3. Copy the compiled jar file into the container
+# We use a wildcard (*.jar) so you don't have to worry about version numbers
+COPY target/*.jar app.jar
+
+# 4. Run the jar file
+ENTRYPOINT ["java", "-jar", "app.jar"]

docker-compose.yml

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+version: '3.8'
+
+services:
+  # ----------------------------
+  # 1. THE BRAIN (Eureka Server)
+  # ----------------------------
+  discovery-server:
+    image: discovery-server:latest
+    container_name: discovery-server
+    build: ./discovery-server       # Tells Docker where to find the Dockerfile
+    ports:
+      - "8761:8761"                 # Maps Localhost:8761 -> Container:8761
+    environment:
+      - SPRING_APPLICATION_NAME=discovery-server
+    networks:
+      - microservices-net
+
+  # ----------------------------
+  # 2. THE GATEKEEPER (API Gateway)
+  # ----------------------------
+  api-gateway:
+    image: api-gateway:latest
+    container_name: api-gateway
+    build: ./api-gateway
+    ports:
+      - "8080:8080"                 # This is the ONLY entry point for users
+    environment:
+      - SPRING_APPLICATION_NAME=api-gateway
+      # The MAGIC: We tell it Eureka is at "http://discovery-server" (not localhost)
+      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://discovery-server:8761/eureka/
+    depends_on:
+      - discovery-server
+    networks:
+      - microservices-net
+
+  # ----------------------------
+  # 3. BOOKING SERVICE
+  # ----------------------------
+  booking-service:
+    image: booking-service:latest
+    container_name: booking-service
+    build: ./booking-service
+    ports:
+      - "8081:8080"                 # Optional: access directly via localhost:8081 if needed
+    environment:
+      - SPRING_APPLICATION_NAME=booking-service
+      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://discovery-server:8761/eureka/
+    depends_on:
+      - discovery-server
+      - api-gateway
+    networks:
+      - microservices-net
+
+  # ----------------------------
+  # 4. EVENT SERVICE
+  # ----------------------------
+  event-service:
+    image: event-service:latest
+    container_name: event-service
+    build: ./event-service
+    ports:
+      - "8082:8080"                 # Optional: access directly via localhost:8082 if needed
+    environment:
+      - SPRING_APPLICATION_NAME=event-service
+      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://discovery-server:8761/eureka/
+    depends_on:
+      - discovery-server
+      - api-gateway
+    networks:
+      - microservices-net
+
+# Create a shared network so they can talk to each other
+networks:
+  microservices-net:
+    driver: bridge

event-service/Dockerfile

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+# 1. Use an official Java runtime as a parent image
+FROM eclipse-temurin:17-jdk-alpine
+
+# 2. Set the working directory inside the container
+WORKDIR /app
+
+# 3. Copy the compiled jar file into the container
+# We use a wildcard (*.jar) so you don't have to worry about version numbers
+COPY target/*.jar app.jar
+
+# 4. Run the jar file
+ENTRYPOINT ["java", "-jar", "app.jar"]