An agent? Why?
A agent has sources, and that sources freely configurable. If you use syslog you have to define the port, an tail doesn't need one and so on.
Or did you mean a collector? That will be done in flume-conf.xml

best,
 Alex 

--
Alexander Lorenz
http://mapredit.blogspot.com

On Mar 13, 2012, at 3:01 AM, lulynn_2008 wrote:

> Hi, 
> 
> how to start an flume agent with a specify port? 
> For example, I want to start agent1 with port 35863.
> 
>