docker - Docker组成的持续集成

Question

我是docker技术的新手。我实际上有一个任务要使用docker-compose创建一个用于持续集成的环境，这是我所做的docker-compose，但是当运行docker-compose时，我仍然遇到一些错误，例如声纳异常:数据库连接失败。
实际的操作系统是VirtualBox窗口下的oracle linux。

version: '2'

networks:
  devnet:
    driver: bridge

services:
 nexus:
  image: sonatype/nexus
  container_name: nexus
  ports:
    - "8081:8081"
  networks:
    - devnet
  volumes:
    - "/opt/nexus/:/var/lib/nexus"

 jenkins:
  image: jenkins
  container_name: jenkins
  ports:
    - "8080:8080"
  networks:
    - devnet
  volumes:
    - "$PWD/jenkins:/var/jenkins_home"


 mongodb:
  image: mongo
  networks:
  - devnet
  ports:
    - 8085:8085  
  environment:
    - MONGODB_USER=root
    - MONGODB_DATABASE=srsmongodb
    - MONGODB_PASS=root
  volumes:
    - /srv/docker/mongodb:/var/lib/mongodb
  restart: always

 tomcat:
    image: tomcat
    container_name: tomcat
    networks:
    - devnet
    volumes:
      - ./target/ROOT.war:/usr/local/tomcat/webapps/ROOT.war
    ports:
      - 8084:8084
    restart: always

 sonarqube:
  image: sonarqube
  container_name: sonarqube
  restart: always
  ports:
   - "9000:9000"
  networks:
    - devnet
  environment:
    - SONARQUBE_JDBC_USERNAME=root
    - SONARQUBE_JDBC_PASSWORD=root
    - SONARQUBE_JDBC_URL=jdbc:mysql://sonardb:3306/sonar?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance
  volumes:
    - "/opt/sonar/:/var/lib/sonar"
  depends_on:
    - mysql

 mysql:
  image: mysql
  networks:
    - devnet
  restart: always
  ports:
    - 3307:3307
  tty: true
  volumes:
    - /opt/mysql:/var/lib/mysql:rw
  environment:
    - MYSQL_ROOT_PASSWORD=root
    - MYSQL_DATABASE=sonardb 

Answer 1

似乎您正在将MySQL数据库的DNS名称与MySQL数据库的名称混淆。在您的示例中，sonarqube图像的JDBC URL应为:

jdbc:mysql://mysql:3306/sonardb?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance

在Docker Compose中创建网络时，该网络中的服务将通过与该服务相同的DNS名称来使用。在这种情况下， mysql将解析为MySQL容器的IP地址。您提供给 mysql服务的环境变量将创建一个名为 sonardb的数据库。

具体参见 https://docs.docker.com/compose/networking/#links的“链接”部分:

by default, any service can reach any other service at that service’s name. In the following example, db is reachable from web at the hostnames db and database