Existing lock /var/run/yum.pid: another copy is running

问题：Existing lock /var/run/yum.pid: another copy is running

错误重现：

Existing lock /var/run/yum.pid: another copy is running
as pid 8706.
Another app is currently holding the yum lock; waiting
for it to exit...
The other application is: PackageKit
Memory : 104 M RSS (521 MB VSZ)
Started: Sat Mar 23 15:04:42 2019 - 00:59 ago
State : Sleeping, pid: 8706
Another app is currently holding the yum lock; waiting
for it to exit...
The other application is: PackageKit
Memory : 104 M RSS (521 MB VSZ)
Started: Sat Mar 23 15:04:42 2019 - 01:01 ago
State : Sleeping, pid: 8706
Another app is currently holding the yum lock; waiting
for it to exit...
The other application is: PackageKit
Memory : 104 M RSS (521 MB VSZ)
Started: Sat Mar 23 15:04:42 2019 - 01:03 ago
State : Sleeping, pid: 8706
......

出现以上问题的主要原因在于：另外一个应用正在锁住进程锁。waiting for it to exit... 意为该应用等待解锁。此外，由上图可知，yum的pid号为8706。

解决方案：

[root@itheima ~]# rm -f /var/run/yum.pid

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