用yum安装包有时候会提示

```

Another app is currently holding the yum lock; waiting for it to exit...

  The other application is: PackageKit

    Memory : 128 M RSS (439 MB VSZ)

    Started: Fri Aug 28 08:08:31 2015 - 48:25 ago

    State  : Sleeping, pid: 3462

```

解决方法：

```

rm -f /var/run/yum.pid

```

然后重新执行yum就可以了

永久禁止该错误

```

[root@oracle pluginconf.d]# cd /etc/yum/pluginconf.d/

[root@oracle pluginconf.d]# ls

product-id.conf  refresh-packagekit.conf  rhnplugin.conf  security.conf  subscription-manager.conf

[root@oracle pluginconf.d]# vim refresh-packagekit.conf

[main]

enabled=0  --将原来的1改成0即可