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  • We have moved to kindly check http://onlineAppsDBA.comin future
    Configure Hardware Load Balancer at HTTP Server Layer
    Saturday, September 09, 2006
    Register for R12 upgrade

    Yesterday I discussed about Overview of Load balancer and various types of load balancer as you can configure load balancer at various levels like
    - DNS Layer Load balancing
    - HTTP Server level Hardware Load balancing(Discussed today)
    - Jserv level load balancing (I'll discuss after HTTP level load balancing)

    Today in this post I am discussing only at HTTP Server level Hardware Load balancer.
    Before configuring Load balancer in Oracle Apps , you should be familiar with following technologies
    1. Cloning
    Check my previous post to know about cloning
    Cloning Basics
    Cloning Part I
    Cloning Part II
    Metalink Note # 230672.1 Cloning Oracle Applications Release 11i with Rapid Clone
    2. Load Balancer Basics
    Check my previous post for Over of Load balancer
    Load Balancer Overview
    3. Autoconfig
    Check About Autoconfig on My Site
    Metalink Note 165195.1 Using AutoConfig to Manage System Configurations with Oracle Applications 11i

    Broad Level steps for configuring Hardware Load balancer at HTTP Server layer
    A. Configure Hardware Load Balancer for Session Persistence
    B. Apply Prereq. Patch (If you are not on 11.5.10 or higher)
    C. Add additional Web Node using Rapid Clone
    D. Configure Load balancer on Node1
    E. Test Load balancer via Node1
    F. Configure Load balancer on Node2
    G. Test Load balancer via Node2
    H. Test Load balancer is sending requests to both nodes when both Web Nodes are Up

    Yesterday I posted that you need extra attention while configuring Load balancer at HTTP layer is about
    Session Persistence - Hardware level Load Balancer should be configured for session persistence also called as stickness or sticky bit for Oracle Apps 11i . If this is not set & lets assume client1 first request went to Node1 after authentication if next request for client1 goes to Node2 who is not aware of client1 's previous request will throw authentication again. Don't worry about how to set it, ask vendor or Unix Administrator to set sticky bit or session persistence .

    Now you have broad overview of configuring Load balancer at HTTP layer, I'll discuss in detail why you need to apply above patches & what all step by step configuration and parameters which needs to be changed and reasoning behind those changes . Till then check for Cloning, Autoconfig.

    If you are preparing for Apps DBA Interview's and want to learn Apps via these questions then check sample questions with answers at my Site there are around 16 pages with 5-6 questions on each page . Do let me know if you want to discuss any Interview Question which you encountered or want to share with budding Apps DBA's then mail me at

    Happy Learning

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    posted by Atul Kumar @ 12:31 AM  
    • At 2:29 PM, Blogger Hank said…

      Hi, Atul,

      I have a shared APPL TOP APPS structure of two nodes, we are using DNS F5BigIP load balancer(it seems to be the same as HTTP LB), but I found the two nodes' Jserv Properties file has the same ports range defined, say, port=16750-16759(we do not use the conventional default port 8001/8007). If we are using Jserv LB, should we allocate the ports into two nodes? We have a F5 server using DNS LB, can you tell me the advantages and drawbacks of DNS and Jserv LBs?

      We use session persistent(as most session will take long time, keeping them active over 2 hours) I found DB tiers are not load balanced well, one is pretty heat. I have a Plug-ins used with my grid control to monitoring the F5, but how can I figure out if LB works well or not?

      Thanks a lot,


    • At 2:53 PM, Blogger Atul Kumar said…

      Hardware loadbalancer are always better and preferred over software loadbalancer as HW LB is stable and provide more configurations.

      Your question about loadbalancer is not clear .

      Do you want to check if LB is working or not meaning its transfering requests to both servers or not ?
      If you wish to check this , check access_log on both servers and you should get hits on both web servers configured in pool of load balancer.

    • At 3:58 PM, Blogger Hank said…


      Thanks a lot for the information.
      I am using the shared top structure, so the access log from two nodes merged, I did find some seesions from some clients, but it hard to to tell which apps node were hit.


    • At 4:08 PM, Blogger Atul Kumar said…

      Have you modified access_log location in httpd.conf files from two nodes to same location ?

      You can check for processes "ps -ef | grep httpd" to check if new connections are coming to both servers or not, if this is one time test. shutdown first middle tier & test and then second middle tier

    • At 1:11 AM, Anonymous sree said…

      Hi atul

      i am using two nodes for oracle applications (forms,apache).now i want to configure oracle application with two url's coz i am not using any bigip .
      1)can i confgure two url's in oracle applications for two nodes?
      2) how can i loadbalnce without any bigip ?

      please suugest us and give me configuration how to setup loadbalancer without using thirdparty loadbalancer or any native method in oracle applications for loadbalncer?

      Thanks a lot


    • At 1:16 AM, Blogger Atul Kumar said…


      Yes you can configure two url's for two nodes both pointing to single instance using profile options and context file.

      2) how can i loadbalnce without any bigip ?

      Use any other supported software load balancer, one which I am aware is Oracle WebCache as load balancer in front of E-Business Suite

    • At 1:52 PM, Anonymous M Ashour said…

      You've said as a first step "A. Configure Hardware Load Balancer for Session Persistence",the Q is,is it mandatory to be Session Persistence not Non Session Persistence?

    • At 8:11 AM, Blogger vasu said…

      Hi atul,
      Is Networked load balancer will acts as a hardwared loadbalancer.

      I am having the 2 Apps tier nodes for production application and 2 for oracle 10g RAC, How can i achive this http load balancing with only two physical m/c for entire application services.



    • At 8:12 AM, Blogger vasu said…

      Hi atul,
      Is Networked load balancer will acts as a hardwared loadbalancer.

      I am having the 2 Apps tier nodes for production application and 2 for oracle 10g RAC, How can i achive this http load balancing with only two physical m/c for entire application services.



    • At 1:38 PM, Blogger Nitin said…

      Hi Atul,

      We have configure folt tolerance using 2 web & form server on two different node ,
      Our configuration is as below :

      Node A: CARD
      Node B: WF
      Node C: WF

      but now we wants setup load balancer , can you please let me know how do i set up http load balancer for both the 2 web nodes , Also if it possible kindly provide me metalink note on the same.

    • At 9:51 AM, Anonymous laptop Specialist said…

      Thanks for sharing.
      i helped a lot

    • At 8:56 PM, Anonymous Anonymous said…

      Hi Atul,
      I am having problem on URLs when I use load banalncer for my web servers setup with Oracle Application server. I have an alias name in DNS so when users try to loging into web servers they only see the alias name. Even when they login they should not see what web servers they are conneted to. However, at this time when a user login into the web environment through my hardware load balancer it would then direct them directly to the particular XYZwebserver bypassing my hardware/software load balancer. It actually shows exact URL that user is connected to.
      Do you know if there is any place that i can chage this setting or at least if I can mask the real url?


    • At 1:16 PM, Anonymous Sony Laptop Repair said…

      Thanks for keeping us informed.

    Post a Comment
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