yum安装不能正常使用的情况

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# yum -y install fping
Loaded plugins: fastestmirror,refresh-packagekit, security
Existing lock /var/run/yum.pid: anothercopy is running as pid 3009.
Another app is currently holding the yumlock; waiting for it to exit...
  Theother application is: PackageKit
   Memory :  51 M RSS (357 MB VSZ)
   Started: Tue Apr 12 06:29:30 2016 - 2:47:38 ago
   State  : Sleeping, pid: 3009
Another app is currently holding the yumlock; waiting for it to exit...
  Theother application is: PackageKit
   Memory :  51 M RSS (357 MB VSZ)
   Started: Tue Apr 12 06:29:30 2016 - 2:47:40 ago
   State  : Sleeping, pid: 3009

[iyunv@ser Desktop]# yum -y install fping
Loaded plugins: fastestmirror,refresh-packagekit, security
Existing lock /var/run/yum.pid: anothercopy is running as pid 3009.
Another app is currently holding the yumlock; waiting for it to exit...
Another app is currently holding the yumlock; waiting for it to exit...
Another app is currently holding the yumlock; waiting for it to exit...
......

解决办法：
  # rm -rf /var/run/yum.pid 来强行解除锁定即可