centos 中使用yum报错的问题

用yum安装软件然后报这个错误

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Existing lock /var/run/yum.pid: another copy is running as pid 11497.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  49 M RSS (924 MB VSZ)
    Started: Thu Mar 16 23:24:24 2017 - 01:46 ago
    State  : Sleeping, pid: 11497
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  49 M RSS (924 MB VSZ)
    Started: Thu Mar 16 23:24:24 2017 - 01:48 ago
    State  : Sleeping, pid: 11497

解决方法：
                  删除yum.pid文件，并重启yum服务后
                 rm -rf /var/run/yum.pid

　　        /sbin/service yum-updatesd restart

 
还有一个错误，后边是什么来往了，是因为网速太慢或者网卡设置的问题可以尝试修改网卡来解决

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