[Linux-cluster] probe a special port and fence according to the result

[Peter]

Hi!

I am planning to test a service for availability and if the service is  
not available anymore, fence the node and start the service on another  
node. Therefore, i need a clue how to probe a port with system tools.
Sure, with telnet there is a possibility to check. But i have no idea  
to avoid the interactivity. So it is too difficult for me to implement  
and usually not allowed in this environment.

On Solaris, there is the "ping -p" command to test the availability of  
a application waiting on a port. But for Redhat, i have no clue.

Could you please help?


Peter