Guy Waugh wrote: > Hi list, > > I have an LVS-DR service managed by ldirectord with 6 Windows > realservers running IIS. I have been using "checktype=negotiate" setup > whereby the "request" is a script that logs in to the application on the > realserver. > > Of course, when a realserver is down, the "request" doesn't get a valid > "receive" string, so ldirectord rightly takes the relevant realserver > out of the IPVS table. > > The application running on the realservers is very resource-intensive, > and has a built-in "Server too busy -- come back later" mechanism that > kicks in when a realserver determines that is it too overloaded to allow > any new connections. However, the application can continue to service > existing connections. > > The application owners have asked if there is anything we can do to > quiesce realservers that are in the "Too busy" state (i.e. continue to > service existing connections but redirect new connections to other > realservers). > > I see that there is 'feedbackd', which looks pretty much what I want, > but it looks pretty linux-centric. > > What are other people doing about this sort of thing? > I usually use weight. Under keepalived, you can affect a weight on the fly by passing the return code of your health-check. I guess ldirectored can do something similar. If you put a RS with a weight of 0, it will still serve the existing connections and the sticky ones, but won't be receiving new connections. that might be the solution for you.
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