如何链接Docker容器？ [英] How to link docker containers?
问题描述
我尝试链接docker容器，但似乎访问时出错。
I have tried linking my docker containers but it seems to give error on access.
我的结构如下：
- 数据库docker（Mysql）-容器名称为
um-mysql - 返回- end docker（Tomcat）-图像名称为
cz-um-app - 前端docker（Nginx）-图像名称为
cz-um-frontend
- Database docker(Mysql) - Container name is
um-mysql - Back-end docker(Tomcat) - Image name is
cz-um-app - Front-end docker(Nginx) - Image name is
cz-um-frontend
已完成后端与数据库泊坞窗的链接如下所示，它运行良好：
Linking of Back-end with Database docker is done as following and it works perfectly:
$ docker run -p 8080:8080 --name backendservices --link um-mysql:um-mysql cz-um-app
前端与后端的链接如下以下：
The linking of Front-end with Back-end is done as following:
$ docker run -p 80:80 --name frontend --link backendservices:backendservices cz-um-frontend
但是，前端与后端的链接无法正常工作。
But, linking of Front-end with Back-end is not working.
我有一个登录页面，在提交时，它访问一个URL http：// bac kendservices：8080 / MyApp
I have a login page, on submit, it accesses a url http://backendservices:8080/MyApp
在控制台中，错误显示为：
In console, it shows error as:
net::ERR_NAME_NOT_RESOLVED
不确定为什么要链接后端具有数据库的容器可以正常工作，前端与后端的情况不同。 是否需要为此在Nginx中配置一些设置？
Not sure why linking of back-end container with database works fine and not the same case of front-end with back-end. Do I need to configure some settings in Nginx for this?
hosts条目如下，我也可以ping backendservices：
The hosts entry is as following and I am able to ping backendservices too:
推荐答案
首先，您不需要为后端服务映射8080：8080：任何 backendservices 图片中的 EXPOSE d 端口可被其他任何人看到与其链接的容器。
First you don't need to map 8080:8080 for backendservices: any EXPOSEd port in backendservices image is visible by any other container linked to it. No host port mapping needed.
第二，您可以在前端检查后端是否已注册：
Secondly, you can check in your front end if the backend has been register:
docker exec -it frontend bash
cat /etc/hosts
如果不是，请检查 docker ps -a 以查看后端是否仍在运行。
If it is not, check docker ps -a to see if backend is still runnong.
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