docker如何将容器做出镜像

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根据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 /tmp/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        "/bin/echo hello"   22 minutes ago                                                       test
[root@localhost ~]# docker diff b42c1ba929a9
C /tmp
A /tmp/test.txt
C /root
A /root/.bash_history

2. 执行docker commit命令创建一个镜像：

[root@localhost ~]# docker commit -m "new container" b42c1ba929a9 yuanhuan/newcontainer1
07b146e0be9e98c253122784c3837dd1604f7692e794f3601dad747d41901cd4
[root@localhost ~]# docker images
REPOSITORY               TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
yuanhuan/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@126.com
Login Succeeded
[root@localhost ~]# docker push yuanhuan/newcontainer1
The push refers to a repository [yuanhuan/newcontainer1] (len: 1)
Sending image list
Pushing repository yuanhuan/newcontainer1 (1 tags)
f1b10cd84249: Image already pushed, skipping
8b44529354f3: Image already pushed, skipping
07b146e0be9e: Image successfully pushed
Pushing tag for rev [07b146e0be9e] on {https://www.56dr.com/host/ 
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