[root@lb02 scripts]# yum  install  pcre-devel  openssl-devel  -y

Loaded plugins: fastestmirror, security

Existing lock /var/run/yum.pid: another copy is running as pid 5243.

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

解决办法是：

方法一：rm -f /var/run/yum.pid

方法二：查看yum进程 ps -ef|grep yum

      kill 进程号

方法三：查看yum进程 ps -ef|grep yum

     killall 进程名