报错：

yum 报错。
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/addons/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: addons
[root@localhost bin]# yum search libaio
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/addons/mirrorlist.txt

Error: Cannot find a valid baseurl for repo: addons

解决方法：

解决方法：
1.
http://blog.csdn.net/justblues/article/details/38582139
2.
http://www.cnblogs.com/kevingrace/p/6252659.html
3.（不知道起作用没）
修改dns  (8.8.8.8和8.8.4.4)

linux 解决问题