RHEL yum 不能使用
[root@localhost ~]# yum install libtool
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
Nothing to do
解决方案1：
1、进入/etc/yum.repos.d/目录。
在命令行输入：wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo
2、mv rhel-debuginfo.repo rhel-debuginfo.repo.bak
3、mv CentOS-Base.repo rhel-debuginfo.repo
4、OK
解决方案2
http://www.cnblogs.com/goodhacker/p/3418222.html