Problem: How To Set Up A Loadbalanced High-Availability Apache Cluster

Discussion in 'HOWTO-Related Questions' started by ndr, May 27, 2009.

  1. ndr

    ndr New Member

    In the tutorial, the setup requires a couple of entries in the ldirectord.conf file that I don't understand. The following:

    request="ldirector.html"
    receive="Test Page"​

    I'm not sure why this needs to be specified in a config file in order for the Apache failover to occur. When I tried just creating a random file on both Apache servers and stopped one, it didn't failover to the second Apache server. Does anyone know why this is?
     
  2. falko

    falko Super Moderator Howtoforge Staff Moderator HowtoForge Supporter ISPConfig Developer

    The load balancers try to fetch this file from the web servers to see if the web servers are still up.
    This is the text that should be in that file.
     
  3. ndr

    ndr New Member

    Thanks! I was thinking it was just to run a test, but I see that it is a file used to monitor the web server at all times, even in production.
     
  4. ndr

    ndr New Member

    New Problem

    I have loadb1/loadb2 setup and webserver1/webserver2 setup. Testing as follows:

    loadb1 - down
    loadb2 - up
    webserver1 - up
    webserver2 - up
    PASS

    loadb1 - up
    loadb2 - down
    webserver1 - up
    webserver2 - up
    PASS

    loadb1 - up
    loadb2 - up
    webserver1 - down
    webserver2 - up
    FAIL

    loadb1 - up
    loadb2 - up
    webserver1 - up
    webserver2 - down
    PASS

    So it seems that everything works, with the exception of when webserver1 is not running. The directors are not transferring requests to webserver 2. What information would be helpful to help diagnose the problem here?

    Thanks!
     
  5. falko

    falko Super Moderator Howtoforge Staff Moderator HowtoForge Supporter ISPConfig Developer

    Did you check the logs in /var/log (especially syslog)?
     
  6. ndr

    ndr New Member

    I've looked at syslog on all 4 servers and cannot figure out why this occurs. I've since rebuilt the entire setup only to find it does the same thing. Therefore, if webserver1 goes down, webserver2 pages aren't served up. Not sure why...

    Any suggestions would be greatly appreciated. I followed the tutorial to every detail, which is VERY detailed.
     

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