You will want to handle traffic for both rpcbind and arserver, and potentially your plugin servers, DSO, on the LB, depending on your implementation. The easiest check is just a port check. I think most LB devices provide this capability. As you recently saw with your Mid-Tier/Tomcat problems, a simple port check does not always fault the node if there is a problem.
What kind of device are you using to balance the traffic? If you are using an F5 LTM, iRules can be written to do more extensive checks. I was part of a thread on the subject here that can provide some additional information: http://devcentral.f5.com/Forums/tabid/1082223/asg/52/showtab/groupforums/afv/topic/aff/31/aft/19000/Default.aspx On Fri, Dec 10, 2010 at 9:49 AM, LJ LongWing <[email protected]> wrote: > ** > > Ok….I’m going down a road that I KNOW some of you have travelled before, I > need your travel tips. We are setting up a server group on 7.5 Windows and > we are putting a load balancer in front of it. How do you all tell if a > node is up? There are 4 types of probes that I’m being told are available… > > > > PING > > HTTP > > TCP > > Script > > > > Ping - Obviously doesn’t tell you anything other than the host OS is up > > HTTP - Won’t work for telling if a remedy service is up > > TCP – My instincts are telling me that this one simply does something > similar to a telnet to a given port, if the port allows you ‘in’, then the > service is considered up. I don’t consider this one viable because it > doesn’t ‘test’ much and I expect that my remedy server could respond to the > port request without actually being functional > > Script – This one is the most promising in my mind, but I know nothing > about the scripting language of TCL. > > > > How does the rest of the remedy world ‘verify’ that their remedy instance > is online so that their load balancer can know to route traffic to it or > not. I just this week finished a java servlet that allows the mid tier load > balancer to know if an individual node is working properly, but the same > can’t be said yet for Remedy….any and all help is appreciated > _attend WWRUG11 www.wwrug.com ARSlist: "Where the Answers Are"_ _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org attend wwrug11 www.wwrug.com ARSList: "Where the Answers Are"
