kernel-devel下载地址
https://ftp.sjtu.edu.cn/sites/ftp.scientificlinux.org/linux/scientific/7.9/x86_64/os/Packages/
rpm -ivh xxx.rpm
#yum install gcc
#yum install gcc-c++
https://ftp.sjtu.edu.cn/sites/ftp.scientificlinux.org/linux/scientific/7.9/x86_64/os/Packages/
rpm -ivh xxx.rpm
#yum install gcc
#yum install gcc-c++