YUM报错及解决办法

[root@xuegod60 ~]# yum clean all
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Existing lock /var/run/yum.pid: another copy is running as pid 3670.
Another app is currently holding the yum lock; waiting for it to exit...
Another app is currently holding the yum lock; waiting for it to exit.

……

[root@xuegod60 ~]# ps -aux | grep yum
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
root       3670  0.0  0.0      0     0 ?        Z    14:27   0:01 [yumBackend.py] <defunct>
root      10595  0.0  0.0 103252   828 pts/0    R+   15:20   0:00 grep yum
[root@xuegod60 ~]# kill -s 9 3670
[root@xuegod60 ~]# ls /var/run/yum.pid
/var/run/yum.pid
[root@xuegod60 ~]# vim !$
vim /var/run/yum.pid
[root@xuegod60 ~]# rm -rf !$
rm -rf /var/run/yum.pid
[root@xuegod60 ~]# ls !$
ls /var/run/yum.pid
ls: cannot access /var/run/yum.pid: No such file or directory
[root@xuegod60 ~]# yum clean all
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Cleaning repos: epel rhel-source
Cleaning up Everything
现在可以了