Springboot 和 Mongo 容器未连接

Question

我正在使用 docker compose 在本地计算机上运行 2 个容器。第一个是 mongo 容器，第二个是 Spring Boot 应用程序。

这是我的 Spring Boot 的 Dockerfile

VOLUME /tmp
ADD target/app.jar app.jar
EXPOSE 8080
RUN bash -c "touch /app.jar"
ENTRYPOINT ["java","-Dspring.data.mongodb.uri=mongodb://mongo/test", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

这是我的 Spring Boot 的应用程序属性

# mongodb configuration0
dockerspring.data.mongodb.uri= mongodb://mongo:27000/test

这是我的 docker-compose.yml

version: '3.1'

services: 

  level-2-springboot:
    image: level-2:latest
    restart: always
    container_name: level_2_microservice
    ports:
      - 8081:8080
    working_dir: /tmp
    depends_on: 
      - mongo

  mongo:
    image: mongo
    container_name: mongo
    ports: 
      - 27000:27017
    restart: always

这是我的 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.yash</groupId>
    <artifactId>spring-sync-ms</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-sync</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>            
        </dependency>       
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <finalName>app</finalName>
    </build>

</project>

我执行此操作来为我的 Spring Boot 应用程序创建图像

docker build -t level-2 。

看到我的图像后，我执行docker-compose up，它们工作得很好，没有错误

这是正在运行的容器

但是当我向 localhost:8081/api/employees/ 或 localhost:8080/api/employees/ 发出 POST 或 GET 请求时，我会收到此消息来自 postman

Could not get any response

下面是我的项目结构

如果我在 eclipse 和 mongo 上手动运行应用程序并执行 POST/GET 请求，我会得到 201 OK，但是当我在容器中使用 docker 执行此操作时，它们不会相互通信。有谁知道这是什么原因造成的吗？

Answer 1

我查阅了互联网，我想我已经得到了你所需要的。

The question that follows is “how does our service container talk to the Mongo container?” For that, we get into container linking. When you run a container, you can pass an optional –link parameter, specifying the running container name that the new container needs to be able to communicate with.

So with our command

docker run -P -d --name employee --link mongodb microservicedemo/employee 

we fire up our new container image, exposing its ports (-P) in the background (-d), naming it employee (–name), and telling it to link to the container named “mongodb” (–link). Linking these does the following:

Creates a hosts file entry in the employee container pointing at the running location of the MongoDB container Inserts a number of environment variables in the employee container to assist with any other programmatic access needed.

To see them run: docker exec employee bash -c 'env |grep MONGODB' Allows containers to communicate directly over ports exposed, so there is no need to worry about the hose machine part mapping.

参见: https://www.3pillarglobal.com/insights/building-a-microservice-architecture-with-spring-boot-and-docker-part-iii

https://www.3pillarglobal.com/insights/building-a-microservice-architecture-with-spring-boot-and-docker-part-ii