docker compose无法访问数据库端口

Question

dockerfile：

FROM anapsix/alpine-java:8_server-jre_unlimited
# copy application
COPY server.jar /opt/test/
COPY application.yml /opt/test/

# expose server ports
EXPOSE 8080 18080

# Run via dumb-init
WORKDIR /opt/test
ENTRYPOINT ["java"]
CMD ["-jar", "server.jar"]

docker撰写文件：

services:
  backend-server:
    image: test.com/server:latest
    build: .
    depends_on:
      - database-server
    ports:
        - "127.0.0.1:8080:8080"
        - "127.0.0.1:18080:18080"
  database-server:
    image: postgres:9.6
    ports:
        - "127.0.0.1:5432:5432"
    environment:
      - POSTGRES_PASSWORD testtest

应用程序属性文件：

spring:
  datasource:
    # use default user/database created by PostgreSQL Docker image upon startup
    url: jdbc:postgresql://localhost/postgres
    username: postgres
    password: testtest
    driver-class-name: org.postgresql.Driver

当我运行docker-comush up时，它将创建一个数据库容器和一个连接到数据库容器的应用程序容器。

但是spring应用程序容器在启动过程中遇到了一些错误：

org.postgresql.util.PSQL异常：连接到localhost:5432被拒绝。检查主机名和端口是否正确，邮政局长是否接受TCP/IP连接。

docker container ls显示数据库正在运行，如果直接运行spring应用程序，我可以访问它。

a295bfd16e2c        postgres:9.6        "docker-entrypoint.s…"   About a minute ago   Up About a minute   127.0.0.1:5432->5432/tcp   server_database-server_1

那我搞砸的问题是什么？

我找到了解决办法

services:
  backend-server:
    image: test.com/server:latest
    build: .
    environment:
      - SPRING_DATASOURCE_URL=jdbc:postgresql://database-server/postgres
    depends_on:
      - database-server
    ports:
        - 8080:8080
        - 18080:18080
  database-server:
    image: postgres:9.6
    ports:
        - 5432:5432
    environment:
      - POSTGRES_PASSWORD testtest

但我仍然无法从我的计算机的localhost:8080访问应用程序，甚至容器的日志也显示了这一点

2018-10-31 15:02:40.881信息1---[main]o.s.b.w.嵌入式。公猫TomcatWebServer:Tomcat已在端口8080（http）上启动，上下文路径为“”

2018-10-31 15:02:40.881信息1---[main]com。测验服务器应用程序：在12.823秒内启动应用程序（JVM运行13.235秒）

Answer 1

services:
  backend-server:
    image: test.com/server:latest
    build: .
    depends_on:
      - database-server
    ports:
        - "127.0.0.1:8080:8080" #change to 8080:8080 without ""and by default set to local so you dont need add local ip
        - "127.0.0.1:18080:18080"  #change to 18080:18080 without ""and by default set to local so you dont need add local ip
  database-server:
    image: postgres:9.6
    ports:
        - "127.0.0.1:5432:5432" #change to 5432:5432 without ""and by default set to local so you dont need add local ip
    environment:
      - POSTGRES_PASSWORD testtest

Answer 2

我建议修改你的docker作文。yml文件如下所示，并对其进行测试

services:


backend-server:
    image: test.com/server:latest
    build: .
    depends_on:
      - database-server
    ports:
        - 8080:8080
        - 18080:18080
  database-server:
    image: postgres:9.6
    ports:
        - 5432:5432
    environment:
      - POSTGRES_PASSWORD testtest