Fix #13 No resolvable bootstrap urls

backend/Dockerfile

@@ -1,5 +1,5 @@
 # 1단계: 빌드 단계
-FROM openjdk:21-jdk-slim AS builder
+FROM openjdk:17-slim AS builder
 
 WORKDIR /build
 
@@ -15,7 +15,7 @@ RUN chmod +x ./gradlew
 RUN ./gradlew clean bootJar --info
 
 # 2단계: 실행 단계
-FROM openjdk:21-jdk-slim
+FROM openjdk:17-slim
 
 WORKDIR /app
 

backend/src/main/resources/application.yml

@@ -2,7 +2,7 @@ spring:
   application:
     name: backend
   kafka:
-    bootstrap-servers: ${SPRING_KAFKA_BOOTSTRAP_SERVERS:localhost:9092}
+    bootstrap-servers: broker-1:29092
     consumer:
       group-id: my-group
       auto-offset-reset: earliest

docker-compose.yml

@@ -7,31 +7,38 @@ services:
       ZOOKEEPER_TICK_TIME: 2000
     ports:
       - "2181:2181"
+    networks:
+      - app-network
+
 
-  kafka:
+  broker-1:
     image: 'confluentinc/cp-kafka:7.2.1'
+    hostname: broker-1
+    container_name: broker-1
     depends_on:
       - zookeeper
     environment:
       KAFKA_BROKER_ID: 1
       KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
-      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:9092,INTERNAL://kafka:9093
-      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,INTERNAL:PLAINTEXT
-      KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker-1:29092
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT
+      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
       KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1 # 토픽 오프셋 복제 계수
     ports:
       - "9092:9092"
+    networks:
+      - app-network
 
   backend:
     build:
       context: ./backend
       dockerfile: Dockerfile
     environment:
-      SPRING_KAFKA_BOOTSTRAP_SERVERS: kafka:9093
+      SPRING_KAFKA_BOOTSTRAP_SERVERS: broker-1:29092
     depends_on: # kafka 실행 후 백엔드 실행되도록 설정
-      - kafka
+      - broker-1
     networks:
-      - kafka-network
+      - app-network
     ports:
       - "8180:8180"
 
@@ -41,14 +48,14 @@ services:
       context: ./report
       dockerfile: Dockerfile
     environment:
-      SPRING_KAFKA_BOOTSTRAP_SERVERS: kafka:9093
+      SPRING_KAFKA_BOOTSTRAP_SERVERS: broker-1:29092
     depends_on: # kafka 실행 후 레포트 실행되도록 설정
-      - kafka
+      - broker-1
     networks:
-      - kafka-network
+      - app-network
     ports:
       - "9090:9090"
 
 networks:
-  kafka-network:
+  app-network:
     driver: bridge

report/Dockerfile

@@ -1,5 +1,5 @@
 # 1단계: 빌드 단계
-FROM openjdk:21-jdk-slim AS builder
+FROM openjdk:17-slim AS builder
 
 WORKDIR /build
 
@@ -15,7 +15,7 @@ RUN chmod +x ./gradlew
 RUN ./gradlew clean bootJar --info
 
 # 2단계: 실행 단계
-FROM openjdk:21-jdk-slim
+FROM openjdk:17-slim
 
 WORKDIR /app
 

report/src/main/resources/application.yml

@@ -2,7 +2,7 @@ spring:
   application:
     name: report
   kafka:
-    bootstrap-servers: ${SPRING_KAFKA_BOOTSTRAP_SERVERS:localhost:9092}
+    bootstrap-servers: broker-1:29092
     consumer:
       group-id: my-group
       auto-offset-reset: earliest