Loaded plugins: fastestmirror File contains no section headers. file: file:///etc/yum.repos.d/CentOS-Base.repo, line: 1 '--2022-05-20 06:01:15-- http://mirros.aliyun.com/repo/Centos-7.repo\n'

装gcc老是找镜像失败

于是换yum源，然后提示报错

解决办法

删除原文件重新下载
删除原有的文件 
# rm -f  /etc/yum.repos.d/CentOS-Base.repo  
重新下载，
# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo  
 清理缓存 
 # yum clean all  
 更新缓存
 # yum makecache

　　原帖https://blog.csdn.net/qq_40996741/article/details/108457206