1、安装之前卸载已存在的docker，新系统跳过
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine
2、使用 repository 安装 docker ce：官方的Docker源速度简直无法忍受，所以上阿里云
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sudo yum install docker-ce
# 启动
systemctl start docker
# 开机启动
systemctl enable docker
3、安装 docker-compose
curl -L https://github.com/docker/compose/releases/download/1.23.2/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
4、为Docker配置阿里云加速
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://jarp5cr2.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
