yum安装时报错：Error: Cannot find a valid baseurl for repo: base

使用yum安装gcc时候报错，详情如下：

Loaded plugins: fastestmirror

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/i386/6/base/mirrorlist.txt

Error: Cannot find a valid baseurl for repo: base

在网上找了很多的方法，但是都不起作用：

最终解决方案：

#sed -i "s|enabled=1|enabled=o|g" /etc/yum/pluginconf.d/fastestmirror.conf

#mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/Centos-Base.repo.backup

#curl -o /etc/yum.repos.d/centos-Base.repo https://www.xmpan.com/Centos-6-Vault-Aliyun.repo

#yum clean all

依次执行完上述命令，yum -y install gcc*就没有报错了。