http://yum.baseurl.org/wiki/WritingYumPlugins

[root@dhcp08 yum-plugins]# pwd
/usr/lib/yum-plugins
[root@dhcp08 yum-plugins]# ls
hello.py  hello.pyc  installonlyn.py  installonlyn.pyc  installonlyn.pyo

vim /etc/yum/pluginconf.d/hello.conf

[main]
enabled=1
tokeep=2

NOTE: if you have noting in this conf file, your plugin will be ignored

now it works, haha

conduits

http://yum.baseurl.org/wiki/WritingYumPlugins

I know Conduits is used for the sake of communication between plugin and yum

Since the auth module I am working on, only need to modify baseurl adding aktk to it

so no need to use Conduits