yum 命令死锁

Another app is currently holding the yum lock; waiting for it to exit…
The other application is: PackageKit
Memory : 40 M RSS (698 MB VSZ)
Started: Wed Jul 15 13:59:01 2015 - 06:29 ago
State : Sleeping, pid: 2305

可以通过执行rm -rf /var/run/yum.pid 来强行解除锁定，然后你的yum就可以运行了。