Solved: CSS Scalable Load Balancing Method

a.veschak · ‎06-25-2009

Greetings All,

Looking to the brain trust here for some options on a requested load balancing schema.

I have a CSS11506 for which I need to configure some 'scalable' load balancing.

We have 2 servers configured for load balancing... we'll call the services S1 and S2.

The requirement is to have S1 to service all traffic until its related server CPU reaches 80%. Once this occurs, then traffic should start being sent to S2 for load balancing.

How can I accomplish this?

Thanks!

-Adam

Gilles Dufour · ‎07-02-2009

Unless you can do SNMP over UDP that will be difficult with the CSS script language.

The ACE device has the snmp probe to do just what you are looking for. But not ACE.

Gilles.

View solution in original post

Gilles Dufour · ‎06-28-2009

Adam,

one solution is to have a script running on the server which can get the cpu load.

You then create a keepalive script on the CSS to poll the S1 cpu load and as long as the value returned is below 80% you keep S2 down.

Gilles.

a.veschak · ‎06-29-2009

Gilles,

Thanks for the reply.

I'm not real savvy with creating scripted keep-alives from scratch.

Can you direct me to some links where I can learn more about creating such a script on the CSS?

Thanks again!

-Adam

Gilles Dufour · ‎06-30-2009

do:

CSS11503-2# sho script ap-kal-httptag

And you will see an example.

Gilles.

a.veschak · ‎06-30-2009

Gilles,

How about something for an SNMP GET ... particularly on the CPU variable?

Thanks,

-Adam

Gilles Dufour · ‎07-02-2009

Unless you can do SNMP over UDP that will be difficult with the CSS script language.

The ACE device has the snmp probe to do just what you are looking for. But not ACE.

Gilles.

Gilles Dufour · ‎07-02-2009

meant SNMP over TCP.

a.veschak · ‎07-06-2009

LOL... yes... ACE is coming to us soon... just trying to figure this out while still on CSS.

Thanks for your help, Gilles!

-Adam