yum lock
[root@falcon21 ~]# ps aux | grep yum
root 3033 2.7 2.2 591064 180228 pts/3 T 14:31 0:17 /usr/bin/python /bin/yum install libxml mbstring XML PCRE PDO JSON
root 16012 0.0 0.0 112724 964 pts/3 S+ 14:42 0:00 grep --color=auto yum
[root@falcon21 ~]# kill -kill 3033