how to download yum package

1, install yum downloadonly
yum install yum-downloadonly

2, check the config
vim /etc/yum/pluginconf.d/downloadonly.conf

3, download package
yum install --downloadonly libaio libaio-devel
updatedb
locate libaio-0.3.106-5.i386.rpm
ll /var/cache/yum/base/packages/

4, you will find two packages in this folder
[root@localhost download]# ll /var/cache/yum/base/packages/
total 40
-rw-r--r-- 1 root root 19798 Jun 3 18:06 libaio-0.3.106-5.i386.rpm
-rw-r--r-- 1 root root 11784 Jun 3 18:06 libaio-devel-0.3.106-5.i386.rpm