查询是否存在mysql时出现问题Existing lock /var/run/yum.pid: another copy is running as pid 2468.

[root@master hyxy]# yum list installed | grep mysql
Existing lock /var/run/yum.pid: another copy is running as pid 2468.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  24 M RSS (334 MB VSZ)
    Started: Mon Aug  6 13:04:33 2018 - 03:00 ago
    State  : Sleeping, pid: 2468
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  24 M RSS (334 MB VSZ)
    Started: Mon Aug  6 13:04:33 2018 - 03:02 ago
    State  : Sleeping, pid: 2468

使用yum命令，查询集群中是否有mysql，一直说lock /var/run/yum.pid: another copy is running as pid 2468.
刚开始以为是端口被占用，后来查了一下，发现是因为yum在自动更新
等待或直接输入 rm -f /var/run/yum.pid
也可以使用 /etc/init.d/yum-updatesd stop
都可以