1. 移除以前docker相关包
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
3. 设置仓库
sudo yum install -y yum-utils
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
3. 安装docker
sudo yum install -y docker-ce --allowerasing
##### 4. 启动docker CE并设置开机自启
```bash
sudo systemctl start docker
sudo systemctl enable docker
5.设置阿里云镜像仓库
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://7kam90oa.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl status docker.service