yum提示Another app is currently holding the yum lock; waiting for it to exit...

使用yum安装计划任务功能，结果提示：

# yum -y install vixie-cron
Loaded plugins: fastestmirror, refresh-packagekit, security
Existing lock /var/run/yum.pid: another copy is running as pid 25960.
Another app is currently holding the yum lock; waiting for it to exit...
 

可能是系统自动升级正在运行，yum在锁定状态中。
已经有一个yum进程在运行了，使用kill干掉它：

# kill -s 9 4772
# ps aux|grep yum
root 6744 0.0 0.0 103260 900 pts/1 S+ 14:59 0:00 grep yum
root 25960 0.0 0.0 0 0 ? Z Sep19 0:01 [yumBackend.py] <defunct>
 

很遗憾，kill对付不了它，那怎么办呢？

可以通过强制关掉yum进程：

#rm -f /var/run/yum.pid
 

然后就可以使用yum了。