报错信息：
Another app is currently holding the yum lock; waiting for it to exit…
The other application is: yum
Memory : 26 M RSS (557 MB VSZ)
Started: Tue Dec 7 14:03:34 2021 - 07:01 ago
State : Traced/Stopped, pid: 28317
解决方案：
杀进程：
kill -s -9 PID (28317)
查看进程：
ps -ef | grep 28317
没有进程即可
