Docker执行DockerFile构建过程指令解析

#拉取基础镜像 centos:latest
	[root@docker ~]# docker pull centos
#创建工作目录 /dockerfile
	[root@docker ~]# mkdir /mydocker
#编写 dockerfile
	[root@docker ~]# vim /mydocker/dockerfile_centos
	FROM centos
	MAINTAINER zzyy<zzyy167@126.com
	RUN touch /test
	ENV MYPATH /test   #登录容器落脚点路径
	WORKDIR $MYPATH
	RUN yum install -y vim
	EXPOSE 80       #暴露的端口80
	CMD echo $MYPATH
	CMD echo "success------------ok"
	CMD /bin/bash
#构建新的镜像
	[root@docker ~]# docker build -f /mydocker/dockerfile_centos -t mycentos:test .
	……略……
	Successfully built ed8bd0ce1d67
	Successfully tagged mycenter:test
#查看新镜像
	[root@docker ~]# docker images
	REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
	mycentos            test                ed8bd0ce1d67        39 seconds aGo      300MB
	centos              latest              0f3e07c0138f        13 months ago       220MB
#启动容器
	[root@docker ~]# docker run -it mycentos:test
	[root@0cdd7d2f5595 test   #登录容器落脚点路径]# 
#验证 vim 是否安装
	[root@0cdd7d2f5595 test   #登录容器落脚点路径]# rpm -qa vim*
	vim-minimal-8.0.1763-10.el8.x86_64
	vim-common-8.0.1763-13.el8.x86_64
	vim-enhanced-8.0.1763-13.el8.x86_64
	vim-filesystem-8.0.1763-13.el8.noarch