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小百科  ›  设置 Docker Compose 的服务健康检查，解决 depends_on 的依赖问题 | xxyopen
jvm gateway mysql docker
着急的冰淇淋
2 月前

我们都知道使用 Docker Compose 进行容器编排时， depends_on 属性可以设置两个容器的依赖关系，只有当被依赖的容器启动后，依赖的容器才会去启动。例如：在 novel-cloud 项目中，novel-monitor 监控服务需要等待其它所有的微服务启动成功并注册到 nacos 后，才能在启动时读取到 nacos 中注册的服务信息，所以需要设置 novel-monitor 服务依赖于其它的所有微服务。

然而 depends_on 属性默认设置的是 Docker 容器启动的依赖关系，也就是只能保证当其它微服务的 Docker 容器启动后，才去启动 novel-monitor 容器，不能保证其它微服务的 Docker 容器内部的 java 进程完全启动后再去启动 novel-monitor 容器。

所以这个时候需要设置每个微服务的健康检查，检查内部的 java 进程是否已经成功启动，只有当每个微服务容器内部的 java 进程成功启动后才能去启动 novel-monitor 容器。

没有设置健康检查时的编排文件如下： 

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version: '3.9'

services:
  # ...省略若干服务

  novel-nacos-server:
    container_name: novel-nacos-server
    image: nacos/nacos-server:${NACOS_VERSION}
    restart: always
    hostname: novel-nacos-server
    environment:
      - PREFER_HOST_MODE=hostname
      - MODE=standalone
      - SPRING_DATASOURCE_PLATFORM=mysql
      - MYSQL_SERVICE_HOST=novel-mysql
      - MYSQL_SERVICE_DB_NAME=nacos
      - MYSQL_SERVICE_PORT=3306
      - MYSQL_SERVICE_USER=root
      - MYSQL_SERVICE_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - MYSQL_SERVICE_DB_PARAM=characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useSSL=false&allowPublicKeyRetrieval=true
      - NACOS_AUTH_IDENTITY_KEY=xxyopen
      - NACOS_AUTH_IDENTITY_VALUE=xxyopen
      - NACOS_AUTH_TOKEN=SecretKey012345678901234567890123456789012345678901234567890123456789
      - JVM_XMS=125M
      - JVM_XMX=125M
      - JVM_XMN=50M
      - JVM_MS=50M
      - JVM_MMS=50M
    ports:
      - "8848:8848"
      - "9848:9848"
    depends_on:
      - novel-mysql
    networks:
      - novelnet
  

  novel-gateway:
    build: ./novel-gateway
    image: novel-gateway:${NOVEL_CLOUD_VERSION}
    container_name: novel-gateway
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "8888:8888"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
        
  novel-home-service:
    build: ./novel-home-service
    image: novel-home-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-home-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9001:9001"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
  
  novel-news-service:
    build: ./novel-news-service
    image: novel-news-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-news-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9030:9030"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
        
  novel-book-service:
    build: ./novel-book-service
    image: novel-book-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-book-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9020:9020"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
  
  novel-user-service:
    build: ./novel-user-service
    image: novel-user-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-user-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9060:9060"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
  
  novel-search-service:
    build: ./novel-search-service
    image: novel-search-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-search-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9050:9050"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
  
  novel-resource-service:
    build: ./novel-resource-service
    image: novel-resource-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-resource-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9040:9040"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
  
  novel-author-service:
    build: ./novel-author-service
    image: novel-author-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-author-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9010:9010"
    depends_on:
      - novel-nacos-server
    networks:
      - novelnet
  
  novel-monitor:
    build: ./novel-monitor
    image: novel-monitor:${NOVEL_CLOUD_VERSION}
    container_name: novel-monitor
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "8898:8898"
    depends_on:
      - novel-gateway
      - novel-home-service
      - novel-author-service
      - novel-book-service
      - novel-search-service
      - novel-user-service
      - novel-resource-service
      - novel-news-service
    networks:
      - novelnet

nacos 注册中心服务注册情况如下：

novel-monitor 服务注册情况如下：

设置健康检查后的编排文件如下： 

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version: '3.9'

services:
  # ...省略若干服务

  novel-nacos-server:
    container_name: novel-nacos-server
    image: nacos/nacos-server:${NACOS_VERSION}
    restart: always
    hostname: novel-nacos-server
    environment:
      - PREFER_HOST_MODE=hostname
      - MODE=standalone
      - SPRING_DATASOURCE_PLATFORM=mysql
      - MYSQL_SERVICE_HOST=novel-mysql
      - MYSQL_SERVICE_DB_NAME=nacos
      - MYSQL_SERVICE_PORT=3306
      - MYSQL_SERVICE_USER=root
      - MYSQL_SERVICE_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - MYSQL_SERVICE_DB_PARAM=characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useSSL=false&allowPublicKeyRetrieval=true
      - NACOS_AUTH_IDENTITY_KEY=xxyopen
      - NACOS_AUTH_IDENTITY_VALUE=xxyopen
      - NACOS_AUTH_TOKEN=SecretKey012345678901234567890123456789012345678901234567890123456789
      - JVM_XMS=125M
      - JVM_XMX=125M
      - JVM_XMN=50M
      - JVM_MS=50M
      - JVM_MMS=50M
    ports:
      - "8848:8848"
      - "9848:9848"
    depends_on:
      - novel-mysql
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:8848 | grep -q 'HTTP/1.1 404'",
        ]
      interval: 30s
      timeout: 2s
      retries: 120

  novel-gateway:
    build: ./novel-gateway
    image: novel-gateway:${NOVEL_CLOUD_VERSION}
    container_name: novel-gateway
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "8888:8888"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:8888 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120

  novel-home-service:
    build: ./novel-home-service
    image: novel-home-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-home-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9001:9001"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9001 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120
  
  novel-news-service:
    build: ./novel-news-service
    image: novel-news-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-news-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9030:9030"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9030 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120

  novel-book-service:
    build: ./novel-book-service
    image: novel-book-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-book-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9020:9020"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9020 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120
  
  novel-user-service:
    build: ./novel-user-service
    image: novel-user-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-user-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9060:9060"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9060 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120
  
  novel-search-service:
    build: ./novel-search-service
    image: novel-search-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-search-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9050:9050"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9050 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120
  
  novel-resource-service:
    build: ./novel-resource-service
    image: novel-resource-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-resource-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9040:9040"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9040 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120
  
  novel-author-service:
    build: ./novel-author-service
    image: novel-author-service:${NOVEL_CLOUD_VERSION}
    container_name: novel-author-service
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "9010:9010"
    depends_on:
      novel-nacos-server:
        condition: service_healthy
    networks:
      - novelnet
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:9010 | grep -q 'HTTP/1.1 404 Not Found'",
        ]
      interval: 10s
      timeout: 2s
      retries: 120
  
  novel-monitor:
    build: ./novel-monitor
    image: novel-monitor:${NOVEL_CLOUD_VERSION}
    container_name: novel-monitor
    restart: "always"
    environment:
      - JAR_VERSION=${NOVEL_CLOUD_VERSION}
      - NACOS_ADDR=novel-nacos-server:8848
    ports:
      - "8898:8898"
    depends_on:
      novel-gateway:
        condition: service_healthy
      novel-home-service:
        condition: service_healthy
      novel-author-service:
        condition: service_healthy
      novel-book-service:
        condition: service_healthy
      novel-search-service:
        condition: service_healthy
      novel-user-service:
        condition: service_healthy
      novel-resource-service:
        condition: service_healthy
      novel-news-service:
        condition: service_healthy
    networks:
      - novelnet

novel-monitor 服务注册情况如下：

 
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