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Hello,
lidsa@xxxxxxxxxxxxx wrote:
I have read some documents abount LVS, and I am puzzled how virtual server
finds
a real server which had been in downtime.Because the dispatcher don't get
the status
of the real servers.Would you tell me about it>
The director (dispatcher) doesn't know about the RS as you stated
correctly. But it also can't figure out which RS is in what state (with
state referring to physically reachable or/and service reachable).
What you're referring to maybe are the various 3rd party user space
software healthchecker that as their names imply perform kind of a RS
service monitoring. In case a defined healthcheck for a service fails,
the user space tools needs to initialize the removal of this entry in
the IPVS template. This can happen via a ipvsadm call in the shell or,
to finally address your subject, via a netlink socket. The LVS code per
se has no means to provide you with this functionality. I hope I
explained it to your best understanding.
Thank you very much!
lidsa
You're very welcome. Best regards,
Roberto Nibali, ratz
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