阿里的yum源，http://mirrors.aliyun.com/
其中linux-kernel这个源怎么使用？
导入证书什么的怎么弄？
打开上面网页，列表的linux-kernel这一项右边也没有help
使用ELRepo源，按照文档步骤是这样：
1、首先导入GPG密钥
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
2、添加ELRepo源
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
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What you should understand is that the source is the source, but not all yum sources.
The only one that can be called a yum source is
centos
epel
fedora
opensuse
rpmfusion
scientificlinux
As for the source you mentioned, it is just the kernel source code.
You need to compile it yourself.