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HomeDatabaseMysql Tutorial在 Docker 中使用 MySQL

提及虚拟化技术,我可是linuxContainer(LXC)的热爱者。但随着Docker技术的声名鹊起,我想在这展示一下如何使用带有Docker的MyS

提及虚拟化技术,我可是linuxContainer(LXC)的热爱者。但随着Docker技术的声名鹊起,我想在这展示一下如何使用带有Docker的MySQL。

Docker是什么?

实际上,Docker就是LXC的封装。使用起来很有意思。Docker采用LXC来虚拟化每个应用。所以在接下来的示例中,我们会启动chroot环境中一个被封装在自己命名空间内的mysql实例(你也可以设置Cgroups对应的资源)使用Docker的一个亮点就是统一文件系统(aufs)。所以当启动一个Docker容器后,它会记录其aufs总数并只会更新新写入的数据。

Aufs对于大多数应用来说十分有用,并且也能很好地支持数据库测试。在这我只想做个简单的示例-仅仅抛砖引玉,实用性也许并不高- Dockerfile. Dockerfile是Docker镜像的构建脚本

咱们来看看Dockerfile的内容:

FROM Ubuntu
MAINTAINER erkan yanar

ENV DEBIAN_FRONTEND noninteractive
RUN apt-get install -y  python-software-properties
RUN apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
RUN add-apt-repository 'deb precise main'
RUN apt-get update
RUN apt-get install -y mariadb-server
RUN echo "[mysqld]"                      >/etc/mysql/conf.d/docker.cnf
RUN echo "bind-address  = 0.0.0.0"      >>/etc/mysql/conf.d/docker.cnf
RUN echo "innodb_flush_method = O_DSYNC" >>/etc/mysql/conf.d/docker.cnf
RUN echo "skip-name-resolve"            >>/etc/mysql/conf.d/docker.cnf
RUN echo "init_file = /etc/mysql/init"  >>/etc/mysql/conf.d/docker.cnf
RUN echo "GRANT ALL ON *.* TO supa@'%' IDENTIFIED BY 'supa';" >/etc/mysql/init

EXPOSE 3306
USER mysql
ENTRYPOINT mysqld

你可以按自己的需求更改。明白了大意后,,可以进一步优化代码。比如,较少运行步骤:)

运行一下看看 (命名为mysql)

> cat $DOCKERFILENAME | docker build -t mysql -

很好!启动51个容器看看:

> time for i in $(seq 10 60 ) ; do docker  run -d -p 50$i:3306  mysql ; done
..     
real    0m27.446s
user    0m0.264s
sys    0m0.211s

这都是在我笔记本上的结果. 如果使用KVM性能会更好 :)

>  docker ps | grep mysqld |wc -l
51
> docker ps | head -2
CONTAINER ID        IMAGE              COMMAND            CREATED              STATUS              PORTS                    NAMES
6d3a5181cd56        mysql:latest        /bin/sh -c mysqld  About a minute ago  Up About a minute  0.0.0.0:5060->3306/tcp  lonely_pare

快来试试吧 \o/

Docker 的详细介绍:请点这里
Docker 的下载地址:请点这里

开源项目Docker,Red Hat新的虚拟化选择

dockerlite: 轻量级 Linux 虚拟化

Docker的搭建Gitlab CI 全过程详解

Docker 和一个正常的虚拟机有何区别?

Docker 将改变所有事情

linux

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