什么是Docker镜像：
 
 
用户仓库
 
用户  仓库名
 
#docker search
 
查看wordpress镜像：
[root@localhost ~]# docker search wordpress | head -10
NAME                            DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
wordpress                       The WordPress rich content management syst...   845       [OK]       
appcontainers/wordpress         Centos/Debian/Ubuntu Based Customizable Wo...   23                   [OK]
centurylink/wordpress           Wordpress image with MySQL removed.             11                   [OK]
kaihofstetter/wordpress-cli     Installs a configured and ready to use Wor...   8                    [OK]
aveltens/wordpress-backup       Easily backup and restore your WordPress b...   6                    [OK]
bitnami/wordpress               Bitnami Docker Image for WordPress              6                    [OK]
genexies/wordpress              Wordpress 4.3 image + custom wp-content by...   1                    [OK]
scjalliance/wordpress           WordPress with GD and FreeType                  1                    [OK]
apsl/wordpress                  Wordpress on LAMP managed with circus. Wor...   1                    [OK]
[root@localhost ~]# 
 
拉取wordpress镜像：
[root@localhost ~]# docker pull wordpress 
latest: Pulling from wordpress
caa7f258cb4f: Pulling fs layer 
f70905b9ca20: Pulling fs layer 
04b616f9cdef: Pulling fs layer 
1a930f9a5fa9: Pulling fs layer 
d8bd0657b25f: Already exists 
a582cd499e0f: Already exists 
528f28a57c47: Already exists 
27e957187676: Already exists 
04b616f9cdef: Pull complete 
1a930f9a5fa9: Download complete 
462edee6fd2a: Download complete 
54a86a8dfaf7: Download complete 
b7ee93d44332: Download complete 
8ce5820e0517: Download complete 
8f24f05131c1: Download complete 
4016089f3db5: Download complete 
b1b017519df2: Download complete 
94bf05895c23: Download complete 
ef7eb6829d79: Download complete 
3f26928ce25c: Download complete 
0bcb4315b109: Download complete 
2f33de4034ce: Download complete 
56cafc444b5f: Download complete 
6cf49b20533c: Download complete 
f84be661daf6: Download complete 
ceac16e1b353: Download complete 
2e3a92ab0ae6: Download complete 
44ec32c6d6f3: Download complete 
e4d56c6e1287: Download complete 
611919b3d4be: Download complete 
92b5b33d3eab: Download complete 
e2f419cc324c: Download complete 
3a919225b712: Download complete 
3f6d0b12f5ad: Download complete 
Status: Downloaded newer image for wordpress:latest
 
检查Centos详细信息：
[root@localhost ~]# docker inspect centos
[
{
    "Id": "5a7df8dd4d20d7222d717422e1671d237ab315d7deefb1fe56a745e2bccbc331",
    "Parent": "",
    "Comment": "Imported from -",
    "Created": "2016-03-14T01:57:33.593259349Z",
    "Container": "",
    "ContainerConfig": {
        "Hostname": "",
        "Domainname": "",
        "User": "",
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": null,
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": null,
        "Cmd": null,
        "Image": "",
        "Volumes": null,
        "VolumeDriver": "",
        "WorkingDir": "",
        "Entrypoint": null,
        "NetworkDisabled": false,
        "MacAddress": "",
        "OnBuild": null,
        "Labels": null
    },
    "DockerVersion": "1.7.1",
    "Author": "",
    "Config": {
        "Hostname": "",
        "Domainname": "",
        "User": "",
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": null,
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": null,
        "Cmd": null,
        "Image": "",
        "Volumes": null,
        "VolumeDriver": "",
        "WorkingDir": "",
        "Entrypoint": null,
        "NetworkDisabled": false,
        "MacAddress": "",
        "OnBuild": null,
        "Labels": null
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Size": 323957253,
    "VirtualSize": 323957253
}
]
[root@localhost ~]# 
 
删除centos5
[root@localhost ~]# docker rmi centos5