events Get real time events from the server
--实时输出Docker服务器端的事件，包括容器的创建，启动，关闭等。
譬如：
[root@localhost ~]# docker events
2015-09-08T17:40:13.000000000+08:00 d2a2ef5ddb90b505acaf6b59ab43eecf7eddbd3e71f36572436c34dc0763db79: (from wordpress) create
2015-09-08T17:40:14.000000000+08:00 d2a2ef5ddb90b505acaf6b59ab43eecf7eddbd3e71f36572436c34dc0763db79: (from wordpress) die
2015-09-08T17:42:10.000000000+08:00 839866a338db6dd626fa8eabeef53a839e4d2e2eb16ebd89679aa722c4caa5f7: (from mysql) start
exec Run a command in a running container
--用于容器启动之后，执行其它的任务
通过exec命令可以创建两种任务：后台型任务和交互型任务
后台型任务：docker exec -d cc touch 123 其中cc是容器名
交互型任务：
[root@localhost ~]# docker exec -i -t cc /bin/bash
root@1e5bb46d801b:/# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
export Export a container's filesystem as a tar archive
--将容器的文件系统打包成tar文件
有两种方式：
docker export -o mysqldb1.tar mysqldb
docker export mysqldb > mysqldb.tar
history Show the history of an image
--显示镜像制作的过程，相当于dockfile
images List images
--列出本机的所有镜像
import Import the contents from a tarball to create a filesystem image
--根据tar文件的内容新建一个镜像，与之前的export命令相对应
[root@localhost ~]# docker import mysqldb.tar mysql:v1
eb81de183cd94fd6f0231de4ff29969db822afd3a25841d2dc9cf3562d135a10
[root@localhost ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
mysql v1 eb81de183cd9 21 seconds ago 281.9 MB
info Display system-wide information
--查看docker的系统信息
[root@localhost ~]# docker info
Containers: 3 --当前有3个容器
Images: 298
Storage Driver: devicemapper
Pool Name: docker-253:0-34402623-pool
Pool Blocksize: 65.54 kB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 8.677 GB --对应的是下面Data loop file大小
Data Space Total: 107.4 GB
Data Space Available: 5.737 GB
Metadata Space Used: 13.4 MB --对应的是下面Metadata loop file大小
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.134 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
