Re: Changing weight based on actual system load?

[nick garratt <nick-lvs@xxxxxxxxxxxxxx>]

Hi

Presumably you are using some monitoring software to check the health of your cluster components in any case and taking corrective action on failure. I use mon on the LVS director to do this: adding and dropping machines from a service pool, implemented as a mon alert, depending on their status.

With such a setup it is quite trivial to write a SNMP monitor to check system load etc. and generate an alert (or implement this in the monitor script itself) to tweak weighting depending on the results.

I think part of the reason there is not a neatly packaged tool to accomplish this (you can be sure that such scripts have been written) is the diversity of the potential setups.

Nick

> I could
> write my own via perl to check things like load averages, free ram etc
> to try to change weights (wlc) of my servers so that the LVS can send
> the traffic to the server w/ the lowest load, not nescarally least
> connections.
>  
> Is there
> already a tool to do this?  I can't find it.
>  
> -Rylan
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