CentOS 6.6，安装过程如下：
sudo yum install epel-release -y
sudo yum install dnf
错误提示如下：
已加载插件：fastestmirror
设置安装进程
Loading mirror speeds from cached hostfile
* base: mirrors.zju.edu.cn
* epel: mirror01.idc.hinet.net
* extras: mirrors.163.com
* updates: mirrors.zju.edu.cn
No package dnf available.
错误：无须任何处理
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
This package was not found, there is a problem with the warehouse source
yum install https://get.docker.com/rpm/1....