centos安装软件时出现的问题

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

  The other application is: PackageKit

    Memory : 140 M RSS (551 MB VSZ)

    Started: Tue Jul 11 06:37:45 2017 - 01:36 ago

    State  : Sleeping, pid: 37770

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

  The other application is: PackageKit

    Memory : 140 M RSS (551 MB VSZ)

    Started: Tue Jul 11 06:37:45 2017 - 01:38 ago

    State  : Sleeping, pid: 37770

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

  The other application is: PackageKit

    Memory : 140 M RSS (551 MB VSZ)

    Started: Tue Jul 11 06:37:45 2017 - 01:40 ago
    State  : Sleeping, pid: 37770

说明yum程序正在运行，使用rm -f/var/run/yum.pid结束进程就行。