yum安装依赖环境有时候会出现：
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum
Memory : 42 M RSS (438 MB VSZ)
Started: Sat May 22 18:49:57 2021 - 00:08 ago
State : Traced/Stopped, pid: 59611
这时候其实是yum锁，就是你的yum被占用了。
解决方法：
rm -f /var/run/yum.pid
Another app is currently holding the yum lock; waiting for it to exit...
原文：https://www.cnblogs.com/lfl17718347843/p/14799529.html