CentOS6でサポート終了のためyumが利用できない。

# yum install epel-release
Loaded plugins: fastestmirror, security
Setting up Install Process
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/repo/arch combination/
removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base

参考

mirror.centos.orgをまだ利用できるvault.centos.orgへ変更

sed -i.bak 's/mirror.centos.org/vault.centos.org/g' /etc/yum.repos.d/CentOS-Base.repo