使用yum install docker安装完后启动不了，报错如下：
[root@Sakura ~]#

service docker start 

docker: unrecognized service

一直停留在以上步骤，如果有遇到和我一样类似问题的小伙伴可以按照如下方法进行安装，即可安装成功~~

方法一：

• 先移除docker

[root@Sakura ~]#

yum remove docker

再移除docker-selinux(如果你之前有安装过的话)

[root@Sakura ~]#

yum remove docker-selinux

然后修改文件

[root@Sakura ~]#

vi /etc/yum.repos.d/docker.repo

直接填入如下内容：

[dockerrepo]

name=Docker Repository

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

enabled=1

gpgcheck=1

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

• 然后启动安装：

[root@Sakura ~]#

 yum install docker-engine

作为依赖被安装: docker-engine-selinux.noarch 0:1.10.2-1.el7.centos

然后启动docker服务：

[root@Sakura ~]#

service docker start

返回如下状态码：

Starting cgconfig service: [ OK ]
Starting docker: [ OK ]

即可完美的使docker启动成功！！！

方法二：

直接用这条命令安装

[root@Sakura ~]#

curl -fsSL https://get.docker.com/ | sh + sh -c 'sleep 3; yum -y -q install docker-engine'

可能会有以下提示信息，我们不需要去管：

警告：/var/cache/yum/x86_64/7/docker-main-repo/packages/docker-engine-selinux-1.10.2-1.el7.centos.noarch.rpm: 头V4 RSA/SHA512 Signature, 密钥 ID 2c52609d: NOKEY docker-engine-selinux-1.10.2-1.el7.centos.noarch.rpm 的公钥尚未安装 导入 GPG key 0x2C52609D: 用户ID : "Docker Release Tool (releasedocker) " 指纹 : 5811 8e89 f3a9 1289 7c07 0adb f762 2157 2c52 609d 来自 : https://yum.dockerproject.org/gpg setsebool: SELinux is disabled. + sh -c 'docker version' Client: Version: 1.10.2 API version: 1.22 Go version: go1.5.3 Git commit: c3959b1 Built: Mon Feb 22 16:16:33 2016 OS/Arch: linux/amd64 Cannot connect to the Docker daemon. Is the docker daemon running on this host? If you would like to use Docker as a non-root user, you should now consider adding your user to the "docker" group with something like: sudo usermod -aG docker your-user Remember that you will have to log out and back in for this to take effect!

然后直接启动就好了~~~

[root@Sakura ~]#

service docker start Redirecting to /bin/systemctl start docker.service