Docker中的SpringBoot无法连接到Docker中的Mongo [英] SpringBoot in Docker not connecting to Mongo in Docker

问题描述

我有一个Spring Boot应用程序，并使用在brew服务中运行的mongo db开发了它.

I have a Spring Boot Application and developed it with a mongo db which was running in brew services.

要连接到数据库，我只需要在Spring Boot中将以下内容放到application.properties中即可

To get a connection to the db I just had to put the following into application.properties in Spring Boot

spring.data.mongodb.uri=mongodb://localhost:27017/db

将应用程序属性更改为

spring.data.mongodb.uri=mongodb://mongo:27017/db

没有做任何更改，与以前相同的错误.

didtn't change anything, same Error as before.

现在，我正在尝试将SpringBoot应用程序和MongoDB放入Docker-Containers中，但是无法使任何连接正常工作.

Now I'm trying to put the SpringBoot Application and the MongoDB into Docker-Containers, but cant get any connection working.

这是我在SpringBoot应用程序中的Dockerfile:

So this is my Dockerfile in the SpringBoot Application:

FROM openjdk:8-jdk-alpine
VOLUME /tmp
EXPOSE 8080
ADD /build/libs/dg-0.0.1-SNAPSHOT.jar dg-0.0.1-SNAPSHOT.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/dg-0.0.1-SNAPSHOT.jar"]

这是我的Docker-Compose.yml文件:

This is my Docker-Compose.yml file:

version: '3'

services:

mongo:
 container_name: docker-mongo
 image: mongo:latest
 ports:
   - "27017:27017"
 volumes:
  - ./data/db:/data/db

spring:
 depends_on:
   - mongo
 image:
   docker-spring-http-alpine
 ports:
   - "8080:8080"
 links:
   - mongo

使用

docker-compose up

我收到以下错误:(这是实际的错误消息)

I get the following error: (this is the actual error message )

2019-07-08 23:10:19.990  INFO 1 --- [localhost:27017] org.mongodb.driver.cluster: Exception in monitor thread while connecting to server localhost:27017


    com.mongodb.MongoSocketOpenException: Exception opening socket
at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:67) ~[mongodb-driver-core-3.8.2.jar!/:na]
at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:126) ~[mongodb-driver-core-3.8.2.jar!/:na]
at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:117) ~[mongodb-driver-core-3.8.2.jar!/:na]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_212]
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_212]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_212]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_212]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_212]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_212]
at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_212]
at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:64) ~[mongodb-driver-core-3.8.2.jar!/:na]
at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:62) ~[mongodb-driver-core-3.8.2.jar!/:na]
... 3 common frames omitted

有人知道这里出了什么问题吗? 在开发环境中，它就像一种魅力.

Does someone know whats the problem here? In development environment it works like a charm.

预先感谢

将以下行添加到Dockerfile

Adding the following line to the Dockerfile

"-Dspring.data.mongodb.uri=mongodb://mongo:27017/dg"

像这样进入Entrypoint解决了连接问题

into Entrypoint like this solved the connection issue

ENTRYPOINT ["java", "-Dspring.data.mongodb.uri=mongodb://mongo:27017/dg","-Djava.security.egd=file:/dev/./urandom","-jar","/dg-0.0.1-SNAPSHOT.jar"]

我能够在Dockerfile的Entrypoint中获得没有上面提到的行的数据库连接.我想这是如果您想通过链接"连接数据库

I was able to get connection to the db without the mentioned line above in the Entrypoint in the Dockerfile. I guess this is if you like to connect your db over "links"

但是现在我可以通过网络连接了，这是我的代码:

But now I was able to connect over Network, this is my code:

version: '3.6'

services:

 mongo:
 container_name: docker_mongo
 networks:
   - gateway
 ports:
   - "27017:27017"
 hostname: mongo
 image: mongo:latest
 volumes:
   - ./data/db:/data/db

 spring:
 container_name: docker-spring
 networks:
   - gateway
 ports:
   - "8080:8080"
 hostname: spring
 depends_on:
   - mongo
 image: dg-docker-spring-http-alpine-j
 networks:
gateway:
driver: "bridge"

以及应用程序属性中的以下内容

and the following in application properties

spring.data.mongodb.host=docker_mongo
spring.data.mongodb.port=27017
spring.data.mongodb.database=db

因此，该连接现在似乎正在通过网络工作. 相同的代码不适用于3.0版

So it looks like the connection is working over Network now. The same code did not work with Version 3.0

要防止SpringBoot通过本地主机自动连接到mongo，还必须排除MongoAutoConfiguration！

To prevent SpringBoot to connect automatically to mongo over localhost it's also necessary to exclude MongoAutoConfiguration!

@SpringBootApplication(exclude={MongoAutoConfiguration.class})

谢谢大家的帮助

推荐答案

我从未做过spring-boot开发，但是您要显示的错误很可能与mongo问题无关.但是，以下是有关mongo连接失败的原因的说明:

I've never done spring-boot development, but the error you are saying is being displayed may very well be unrelated to the mongo issue. However, here is an explanation as to why your mongo-connection is failing:

docker-compose会创建一个虚拟网络(例如您的情况).

docker-compose creates a virtual network if one hasn't been specified in the file (like in your case).

所有应用程序都在此网络内运行，彼此完全隔离.因此，spring-boot容器中的localhost实际上是指向自身的.这意味着您的spring-boot应用程序期望mongo实例在其容器内运行(不是，它在另一个容器中).

All your applications run inside of this network, completely isolated from each other. As such, localhost in your spring-boot container actually refers to itself. Meaning your spring-boot application is expecting the mongo instance to be running inside of its container (which its not, it's in a different container).

当便携式计算机的网络上同时运行数据库和应用程序时，这会很好.但是如上所述，它们现在完全在docker-compose网络中运行.

This would have been fine when both the database and application was running on your laptop's network. But as mentioned, they are now running in the docker-compose network, in complete isolation.

但是，docker-compose真的很聪明！它为每个容器创建一个DNS，该DNS使用在docker-compose文件中指定的服务名称(在您的情况下为mongo和spring)，以便轻松访问网络内部的容器.

However, docker-compose is really clever! It creates a DNS for each of your containers which uses the service-name (in your case mongo and spring) specified in your docker-compose file to allow for easy access to the containers inside of the network.

因此，您应该能够将spring.data.mongodb.uri=mongodb://localhost:27017/db更改为spring.data.mongodb.uri=mongodb://mongo:27017/db，这应该允许它进行连接.

So, you should be able to change spring.data.mongodb.uri=mongodb://localhost:27017/dbto spring.data.mongodb.uri=mongodb://mongo:27017/db and that should allow it to connect.

这篇关于Docker中的SpringBoot无法连接到Docker中的Mongo的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！