1.创建docker的yum库

[root@localhost~]# cd /etc/yum.repos.d/

[root@localhostyum.repos.d]# vim docker.repo

[dockerrepo]

name=DockerRepository

baseurl=https://yum.dockerproject.org/repo/main/centos/7

enabled=1

gpgcheck=1

gpgkey=https://yum.dockerproject.org/gpg

（2）安装docker

[root@localhost~]# yum install docker-engine

（3）关闭centos7下的firewalld服务并安装iptables-ser

[root@localhost~]# systemctl disable firewalld

rm'/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'

rm'/etc/systemd/system/basic.target.wants/firewalld.service'

[root@localhost~]# yum -y install iptables-services

（4）开启iptables服务

[root@localhost~]# systemctl enable iptables

ln-s '/usr/lib/systemd/system/iptables.service''/etc/systemd/system/basic.target.wants/iptables.service'

[root@localhost~]# systemctl start iptables

（5）启动docker服务并设置开机自动启动

[root@localhost~]# systemctl start docker.service

[root@localhost~]# systemctl enable docker.service

ln-s '/usr/lib/systemd/system/docker.service''/etc/systemd/system/multi-user.target.wants/docker.service'

（6）验证docker是否安装成功

[root@localhost~]# docker info

Containers:0

Images:0

StorageDriver: devicemapper

Pool Name: docker-253:1-50332704-pool

Pool Blocksize: 65.54 kB

Backing Filesystem: xfs

Data file: /dev/loop0

Metadata file: /dev/loop1

Data Space Used: 1.821 GB

Data Space Total: 107.4 GB

Data Space Available: 7.413 GB

Metadata Space Used: 1.479 MB

Metadata Space Total: 2.147 GB

Metadata Space Available: 2.146 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)

ExecutionDriver: native-0.2

LoggingDriver: json-file

KernelVersion: 3.10.0-229.7.2.el7.x86_64

OperatingSystem: CentOS Linux 7 (Core)

CPUs:1

TotalMemory: 1.791 GiB

Name:localhost.localdomain

ID:2EEQ:3VMI:TIUY:NUHZ:NZMQ:VOD7:YW3K:KZG3:IQZT:XR4Q:G4XJ:TCVM

（8）查看安装后的docker版本

[root@localhost~]# docker version

Client:

Version:     1.8.2

API version: 1.20

Go version:  go1.4.2

Git commit:  0a8c2e3

Built:       Thu Sep 10 19:08:45 UTC 2015

OS/Arch:     linux/amd64

Server:

Version:     1.8.2

API version: 1.20

Go version:  go1.4.2

Git commit:  0a8c2e3

Built:       Thu Sep 10 19:08:45 UTC 2015

OS/Arch:     linux/amd64