Loaded plugins: fastestmirror, refresh-packagekit, security
Existing lock /var/run/yum.pid: another copy is running as pid 3037.
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum
Memory : 21 M RSS (318 MB VSZ)
Started: Wed Jul 25 03:46:51 2018 - 01:04 ago
State : Traced/Stopped, pid: 3037杀死yum进程
rm -f /var/run/yum.pid