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 <erkan.yanar@linsenraum.de> 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 http://mirror2.hs-esslingen.de/mariadb/repo/10.0/ubuntu 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/

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