可以在一个mysql数据库容器上运行docker容器的两个实例吗? [英] Possible to run two instances of docker containers on one mysql database container?

问题描述

有三个容器

容器A:Web服务器 容器B:容器A的复制Web服务器 容器Z:容器A的mysql数据存储容器

Container A : web server Container B : replicate web server of Container A Container Z : mysql datastore container for Container A

我可以同时使用容器Z作为mysql数据存储运行容器A和B吗?会损坏mysql数据存储吗?

Can I run Container A and B at the same time using Container Z as mysql datastore? will it corrupt mysql data store?

以下容器的运行时:

容器Z: docker run --name mysql_datastore -it busybox:mysql_datastore true

Container Z : docker run --name mysql_datastore -it busybox:mysql_datastore true

容器A: docker run -it -p 80:80 --volumes- from mysql_datastore --name webservera -h webservera centos:webseverwithmysql/bin/bash

Container A: docker run -it -p 80:80 --volumes-from mysql_datastore --name webservera -h webservera centos:webseverwithmysql /bin/bash

容器B: docker run -it -p 81:81 --volumes- from mysql_datastore --name webserverb -h webserverb centos:webseverwithmysql/bin/bash

Container B : docker run -it -p 81:81 --volumes-from mysql_datastore --name webserverb -h webserverb centos:webseverwithmysql /bin/bash

推荐答案

希望这些解释之一是正确的.

Hopefully one of these interpretations is correct.

否，每个守护程序都需要一个单独的数据目录以避免冲突.您可以在共享卷中放置多个数据目录，但是这样做的结果是多个完全独立的数据库. -源

No, each daemon needs a separate data directory to avoid conflicts. You could put multiple data directories in the shared volume, but the result of that is multiple completely separate databases. - source

是的，可以允许多个容器连接到单个数据库容器，但不能共享卷.容器Z将运行mysql守护程序，其他容器可以通过tcp套接字连接到它. 官方mysql存储库自述文件具有入门步骤:

Yes it is possible to allow multiple containers to connect to a single database container, but not by sharing volumes. Container Z will run the mysql daemon and other containers can connect to it via tcp sockets. The official mysql repo readme has steps to get started:

首先启动ContainerZ.

First start Container Z.

docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=mysecretpassword -d mysql

然后使用以下类似方式运行要连接到数据库的其他容器:

Then run other containers that you want to connect to the database with something like this:

docker run --name webservera --link some-mysql:mysql -d application-that-uses-mysql

--link标志的文档.容器链接为链接别名添加了一个主机文件条目，因此您无需手动查找地址.您的网络服务器的数据库配置看起来像这样

Docs for the --link flag. Container linking adds a hostfile entry for the link alias so you don't have to find the address manually. Your webserver's database configuration would look something like this

jdbc:mysql://address=(protocol=tcp)(host=mysql)(port=3306)(user=root)(password=mysecretpassword) 

我希望这会有所帮助.

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