DockerFile实战测试

创建一个自己的centos

1.编写dockerfile的文件

[root@localhost dockerfile]# cat mydockerfile 
FROM centos
MAINTAINER gaole<[email protected]>
ENV MYPATH /usr/local
WORKDIR $MYPATH    #一开始的时候这里写错了，没有写$,所有进去以后到了/MYPATH的路径
RUN yum -y install vim
RUN yum -y install net-tools
EXPOSE 80
CMD echo "welcome to gaole's centos"
CMD /bin/bash

2.通过这个文件构建镜像，最后有一个点

[root@localhost dockerfile]# docker build -f mydockerfile -t mycentos:1.0 .

[root@localhost dockerfile]# docker images
REPOSITORY         TAG       IMAGE ID       CREATED          SIZE
mycentos           1.0       09170a90d5db   15 seconds ago   326MB
kuangshen/centos   latest    915412bdf8be   19 hours ago     231MB
mysql              latest    3218b38490ce   5 weeks ago      516MB
hello-world        latest    feb5d9fea6a5   4 months ago     13.3kB
centos             latest    5d0da3dc9764   4 months ago     231MB

3.运行测试

docker run -it mycentos:1.0   #直接就进去了，然后就会到工作目录，注意必须要加版本号，不加默认下载最新版本

4.docker history +imagesID  可以看到镜像构建的过程

[root@localhost dockerfile]# docker history 09170a90d5db
IMAGE          CREATED         CREATED BY                                      SIZE      COMMENT
09170a90d5db   7 minutes ago   /bin/sh -c #(nop)  CMD ["/bin/sh" "-c" "/bin鈥  0B        
b010236262ea   7 minutes ago   /bin/sh -c #(nop)  CMD ["/bin/sh" "-c" "echo鈥  0B        
550f564f074f