Loaded plugins: fastestmirror, refresh-packagekit, security Existing lock /var/run/yum.pid: another copy is running as pid 2135. Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit Memory : 43 M RSS (891 MB VSZ) Started: Wed Apr 1 03:57:30 2015 - 02:23 ago State : Sleeping, pid: 2135 Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit Memory : 43 M RSS (891 MB VSZ) Started: Wed Apr 1 03:57:30 2015 - 02:25 ago State : Sleeping, pid: 2135 Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit Memory : 43 M RSS (891 MB VSZ) Started: Wed Apr 1 03:57:30 2015 - 02:27 ago State : Running, pid: 2135
这是因为后台可能有其它的软件在执行安装，占用的yum程序
1 . 可以使用 rm -rf /var/run/yum.pid 来强制接触yum锁定，就可以了
2. 等待yum自己解除锁定(个人认为这样好点，它可能在安装系统必要的其它程序，如果强制解除，可能会有问题)
3. 我遇到这个问题的时候等了大概2分钟左右的时间，它就自动解除锁定了
Centos6.5使用yum安装软件的时候 Another app is currently holding the yum lock; waiting for it to exit...
原文：http://www.cnblogs.com/liuchao102/p/4384221.html