需要centos7版本，內核版本不低於3.10
[root@localhost ~]# uname -r
3.10.0-514.el7.x86_64
第一步：更新當前軟件：
[root@localhost ~]#yum update
第二步：添加Docker的yum源
[root@localhost ~]# cat /etc/yum.repos.d/docker.repo
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
第三步：安裝Docker
[root@localhost ~]# yum install docker-engine
至此安裝完成。
設置Docker服務開機自啟
[root@localhost ~]# systemctl enable docker.service
啟動Docker服務
[root@localhost ~]# systemctl start docker
驗證Docker是否安裝成功
[root@localhost ~]# docker run --rm hello-world
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
由於國外的docker鏡像倉庫一般都比較慢，所以一般會使用國內的一些加速倉庫，如阿里雲
申請：https://cr.console.aliyun.com/#/accelerator
配置：
mkdir -p /etc/docker
cat /etc/docker/daemon.json
{
"registry-mirrors": ["https://xxxxxxx.mirror.aliyuncs.com"]
}
https://xxxxxxx.mirror.aliyuncs.com替換成你申請到的地址。
sudo systemctl daemon-reload
sudo systemctl restart docker
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