带有Docker的Spring Boot + DynamoDB Local：连接到localhost：8000失败 [英] Spring Boot + DynamoDB Local with Docker: Connect to localhost:8000 failed

问题描述

我构建了一个查询DynamoDB的Spring Boot REST API，我想配置一个或两个作为微服务运行的Docker容器：一个在本地运行DynamoDB，另一个运行REST API。我为Spring Boot REST API配置了一个容器，但是当我对该API进行调用时，即使DynamoDB在localhost：8000上运行，它也无法查询本地DynamoDB。我得到的错误是：

I built a Spring Boot REST API that queries DynamoDB, and I would like to configure one or two Docker containers that run as microservices: one that runs DynamoDB locally and another that runs the REST API. I have a container configured for the Spring Boot REST API, but when I make calls to the API, it cannot query the local DynamoDB even though DynamoDB is running on localhost:8000. The error I get is:

无法执行HTTP请求：连接到localhost：8000 [localhost / 127.0.0.1]失败：连接被拒绝（拒绝连接）

尽管收到该消息，我仍可以使用浏览器通过本地主机访问DynamoDB。好像Docker容器即使API容器正在localhost：8080上运行，也不允许API访问localhost：8000。

Despite getting that message, I can access DynamoDB via localhost using my browser. It's as if the Docker container will not allow the API to access localhost:8000 even though the API container is running at localhost:8080.

我应该如何配置我的容器（ s），以便每个都作为独立的微服务运行？有人曾经见过类似的问题吗？

How should I configure my container(s) so that each runs as a separate microservice? Has anyone seen a similar issue before?

推荐答案

localhost 并不指向真实机器主机。从字面上看，当您在任何Docker容器中使用 localhost 时，它将指向容器本身。

localhost inside a container doesn't point to real machine host. Literally when you use localhost inside any docker container it will be pointing to the container itself.

Docker提供了两种处理这种情况的方法：

Docker provides two ways of handling this sitution:

链接。不推荐使用的方法，在新项目中应避免 。

Links. This is deprecated way and should be avoided in new projects.

网络。 Docker可以建立一个网络，您可以在其中通过DNS名称（容器ID或容器名称）访问容器。

Networks. Docker can establish a network where you can access your containers by DNS names (container ID, or container name).

以方式创建网络中所述，将 localhost 替换为数据库容器的名称，即可开始使用。

Create a network in a way described here, replace localhost by the name of DB container and you'll be ready to go.

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