在用yum安装gcc的时候，报了错误：
[root@001 ~]#yum -y install gcc gcc-c++ kernel-devel
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
There are no enabled repos.
Run "yum repolist all" to see the repos you have.
To enable Red Hat Subscription Management repositories:
subscription-manager repos --enable
To enable custom repositories:
yum-config-manager --enable 1、检查是否断网
ping www.baidu.com
2、如果没断网，则说明是yum镜像没有了，需要下载一个：
cd /etc/yum.repos.d mv CentOS-Base.repo CentOS-Base.repo.backup wget http://mirrors.163.com/.help/CentOS6-Base-163.repo mv CentOS6-Base-163.repo CentOS-Base.repo yum clean all
相关视频教程推荐：linux视频教程
