使用yum报错

报错信息如下:
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. $releasever is not a valid release or hasnt been released yet/
removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again

解决:
vim /etc/yum.repos.d/CentOS-Base.repo
把所有的$releasever替换成6或者7,如果是centos6的系统就替换成6,7的系统就替换成7,保存退出就好了。

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