安装 Docker (操作系统为CentOS7 64位)

1).采用yum源的方法安装

$ sudo yum install docker

＊安装过程中会有多次选择y OR n ，选择y以继续安装

安装成功后，会在最后几行有提示：

Installed:
  docker.x86_64 0:1.7.1-108.el7.centos

Dependency Installed:
  docker-selinux.x86_64 0:1.7.1-108.el7.centos

Complete!

2).启动Docker服务

$ sudo service docker start

或者

$ sudo systemctl start docker

3).设置开机启动

$ sudo  systemctl enable docker

4).检查Docker信息

Docker 版本信息：

$ sudo docker version
Client version: 1.7.1
Client API version: 1.19
Package Version (client): docker-1.7.1-108.el7.centos.x86_64
Go version (client): go1.4.2
Git commit (client): 3043001/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Package Version (server): docker-1.7.1-108.el7.centos.x86_64
Go version (server): go1.4.2
Git commit (server): 3043001/1.7.1
OS/Arch (server): linux/amd64
$...

查看系统(Docker)层面信息，包括管理的images, containers数：

$ sudo docker info
Containers: 0
Images: 0
Storage Driver: devicemapper
 Pool Name: docker-8:3-28326-pool
 Pool Blocksize: 65.54 kB
 Backing Filesystem: xfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 307.2 MB
 Data Space Total: 107.4 GB
 Data Space Available: 45.61 GB
 Metadata Space Used: 729.1 kB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.147 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
 Library Version: 1.02.93-RHEL7 (2015-01-28)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.10.0-229.el7.x86_64
Operating System: CentOS Linux 7 (Core)
CPUs: 2
Total Memory: 1.466 GiB
Name: localhost.localdomain
ID: PRVB:3SDE:YL4E:JT5P:5BIR:BUC5:PHXI:HG4B:P753:Y2BI:U7OU:YPGC
$...

至此 Docker 在CentOS下安装步骤就完成了！