Load Balancing in Apache

Applications Web Development
1

Hi All,

I have one webserver which has an application for a set of internal users can be accessed by _http://server1.com

I am planning to load balance this application. For that I have cloned this server and build a new one which can be accessed using _http://server2.com]Server2.com. Also i have a virtual ip. So what I am planning is if the user type _http://virtualip.com then the application running on server 1 should be loaded for him. if the server1 is down, the application running on server2 should be loaded. How can I enable this using simple apache.

2

If the AppServer is on tomcat, you can refer the below link, which is explaining in depth on how to go with load balancing.
The Apache Tomcat Connector - Generic HowTo - LoadBalancer HowTo

If the AppServer is on Weblogic, a sample plugin module in httpd.conf shown below. Where it balances load between server1:7001 and server2:7002

# weblogic plugin -----------------------------
  <IfModule mod_weblogic.c>
    WebLogicCluster server1:7001,server2:7002
    WLIOTimeoutSecs 3600
    MatchExpression /gui/base/
    MatchExpression /gui/core/
    MatchExpression /gui/images/
    MatchExpression /gui/script/
  </IfModule>
  # end weblogic plugin -------------------------
3

With just a plain Apache, you can try starting an additional instance that uses mod_proxy_balance.

Another approach would be using Crossroads.

Or, if it's just fail-over you need, not load balancing, use Linux-HA to switch that between the hosts.