yum被锁定无法使用，错误信息截图如下：
解决方法：
rm
-rf /var/run/yum.pid 来强行解除锁定，然后你的yum就可以运行了
Another app is currently holding the yum lock; waiting for it to exit…,布布扣,bubuko.com
Another app is currently holding the yum lock; waiting for it to exit…
原文：http://www.cnblogs.com/zwl715/p/3642197.html