Axton, We are using Cisco's CSM as a load balancer. I'm surprised in this day and age, with remedy being around as long as it has been that we are having this discussion, but reading a post you made in that thread
'Another option I am considering is writing a program to listen on a port separate that of the application that can handle a request that contains a string. It would simply return a 0 or a 1 if the server is up or down.' I was just considering an option along those lines. To save me some time and maybe help the community, do you by chance have that daemon written? (you did write that post over a year ago) If not, I may need to pull out my eclipse (YET AGAIN) to solve load balancing issues in my environment. From: Action Request System discussion list(ARSList) [mailto:[email protected]] On Behalf Of Axton Sent: Friday, December 10, 2010 9:54 AM To: [email protected] Subject: Re: Load Balancers and how? ** 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"_ _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"
