yum源中$releasever不能被系统识别

服务器yum操做报错 http://mirrors.cloud.aliyuncs.com/centos/%24releasever/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found $releasever变量没有被系统识别，查看rpm -q centos-release，结果package centos-rel

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