docker如何将容器做出镜像？做出镜像可以使用commit命令或dockerfile的方式，commit命令比较简单，相当于docker依据container内部执行的命令自动生成dockerfile，并进行了build，比较适合对dockerfile不熟悉的用户；dockerfile比较适合批量处理的场景。

使用docker commit命令做镜像

1. pull一个centos6.6的基础镜像，并运行一个docker container，然后在其中进行定制化（安装、配置服务等）；

[root@localhost ~]# docker pull centos:6.6
Pulling repository centos
8b44529354f3: Download complete
f1b10cd84249: Download complete
Status: Downloaded newer image for centos:6.6
[root@localhost ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos 6.6 8b44529354f3 4 days ago 202.6 MB
centos centos6.6 8b44529354f3 4 days ago 202.6 MB
[root@localhost ~]# docker run -i -t centos:6.6 bash
[root@b42c1ba929a9 /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root sbin selinux srv sys tmp usr var
[root@b42c1ba929a9 /]# mkdir /test.txt
[root@b42c1ba929a9 /]# exit
exit

接下来，查看一下container的改动：

[root@localhost ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b42c1ba929a9 centos:6.6 "bash" About a minute ago Exited (0) 22 seconds ago berserk_mcclintock
804a56ce8008 f1b10cd84249 "/echo hello" 22 minutes ago test
[root@localhost ~]# docker diff b42c1ba929a9
C /tmp
A /test.txt
C /root
A /.bash_history

2. 执行docker commit命令创建一个镜像：

[root@localhost ~]# docker commit -m "new container" b42c1ba929a9 /newcontainer1
07b146e0be9e98c253122784c3837dd1604f7692e794f3601dad747d41901cd4
[root@localhost ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
/newcontainer1 latest 07b146e0be9e 43 seconds ago 202.6 MB
centos 6.6 8b44529354f3 4 days ago 202.6 MB
centos centos6.6 8b44529354f3 4 days ago 202.6 MB

3. 登录docker，并将该镜像push到docker仓库：

[root@localhost ~]# docker login
Username: yuanhuan
Password:
Email: yuanhuan_2005@
Login Succeeded
[root@localhost ~]# docker push /newcontainer1
The push refers to a repository [/newcontainer1] (len: 1)
Sending image list
Pushing repository /newcontainer1 (1 tags)
f1b10cd84249: Image already pushed, skipping
8b44529354f3: Image already pushed, skipping
07b146e0be9e: Image successfully pushed
Pushing tag for rev [07b146e0be9e] on {}

作者：网易云社区；来源：简书；链接：

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