CentOS7 docker-ce安装

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
wget http://mirror.centos.org/centos/7/extras/x86_64/Packages/container-selinux-2.107-3.el7.noarch.rpm(文件名可能会修改根据实际情况而定)
rpm -ivh container-selinux-2.107-3.el7.noarch.rpm

yum list docker-ce --showduplicates | sort -r #查看所有的docker-ce版本
yum -y install docker-ce
mkdir /data/docker

mkdir -p /etc/docker
tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://yjsxz3wh.mirror.aliyuncs.com"],
  "max-concurrent-downloads": 10,
  "log-driver": "json-file",
  "log-level": "warn",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3"
    },
  "data-root": "/data/docker"
}
EOF
systemctl daemon-reload
systemctl restart docker
或者：

如果你之前安装过 docker，请先删掉
sudo yum remove docker docker-common docker-selinux docker-engine

安装一些依赖
sudo yum install -y yum-utils device-mapper-persistent-data lvm2

根据你的发行版下载repo文件:
wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo

把软件仓库地址替换为 TUNA:
sudo sed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo

最后安装:
sudo yum makecache fast
sudo yum install docker-ce