{"id":1266,"date":"2012-08-31T17:45:10","date_gmt":"2012-08-31T09:45:10","guid":{"rendered":"http:\/\/rmohan.com\/?p=1266"},"modified":"2012-08-31T17:45:10","modified_gmt":"2012-08-31T09:45:10","slug":"apache-server-load-balancing-with-multiple-tomcat-clustering","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=1266","title":{"rendered":"Apache server load balancing with Multiple Tomcat Clustering- :"},"content":{"rendered":"

Load Balancing -: Load balancer accept request from external client and forward them to one of the available Backend servers according to a scheduling algorithm. We can use dedicated hardware and any load balancing software for load balancing Mod_proxy_balancer- : Apache web server\u2019s module of mod_proxy_balancer the apache module developed to provide to load balancing over a set of web server. Load balancer it can keep track of session Sticky Session- A single user always deals with the same backend server.<\/p>\n

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Installation -:
Apache modules- Download from apache\u2019s web site, mod_proxy module for load balancing
Windows-: Download mod_proxy modules and copy in modules directory. Linux- Download mod_proxy modules and run following command for compile.
#.\/configure –enable-proxy –enable-proxy-balancer [run .\/configure \u2013h # make # make install
Configuration-:
Windows-: Enable following load modules in and add require modules in httpd.conf file
C:\\Program Files\\Apache Software Foundation\\Apache2.2\\conf\\httpd.conf
LoadModule proxy_module modules\/mod_proxy.so LoadModule proxy_ajp_module modules\/mod_proxy_ajp.so LoadModule proxy_balancer_module modules\/mod_proxy_balancer.so LoadModule proxy_connect_module modules\/mod_proxy_connect.so LoadModule proxy_ftp_module modules\/mod_proxy_ftp.so LoadModule proxy_http_module modules\/mod_proxy_http.so
Now we can add following lines for proxy-balancer (Cluster name is domain.abc.net with two member)
ProxyRequests Off ProxyPass \/ balancer:\/\/domain.abc.net\/ lbmethod=byrequests stickysession=jsessionid nofailover=On maxattempts=15
ProxyPreserveHost OnBalancerMember http:\/\/192.168.10.10:84 BalancerMember http:\/\/192.168.100.10:85 Linux-
We need three servers one is load balancer and other two workers nodes Http Server configuration file \u201c\/etc\/httpd\/conf\/httpd.conf\u201d add following lines
Include conf\/extra\/httpd-proxy-balancer.conf
Now create the httpd-proxy-balancer.conf file in the \u201c\/etc\/httpd\/conf\/httpd.conf\u201d and add the following lines.
ProxyRequests Off ProxyPass \/ balancer:\/\/domain.abc.net\/ lbmethod=byrequests stickysession=jsessionid nofailover=On maxattempts=15
ProxyPreserveHost OnBalancerMember http:\/\/192.168.10.10:84 BalancerMember http:\/\/192.168.100.10:85 Load balancing method-:
There are three type of load balancing method used in mod_prxy Byrequests-:Weighted request count balancing Bytraffic-: Weighted traffic byte count balancing Bybusyiness-: Pending request balancing
Where method is one of the three listed before. Default is byrequestsBalancerMember http:\/\/192.168.10.10:84 loadfactor=4 BalancerMember http:\/\/192.168.100.10:85 loadfactor=6
A load factor will be applied member of the cluster, in order to define and sharing load balancing between members of cluster.
In the following example 40% of the requests will be forwarded to the first and reaming 60% will be forward to second cluster. <\/p>\n

ProxyPass \/ balancer:\/\/domain.abc.net\/ lbmethod=byrequests stickysession=jsessionid
SESSION_ID is the name of the variable at the application level storing the session identifier.<\/p>\n","protected":false},"excerpt":{"rendered":"

Load Balancing -: Load balancer accept request from external client and forward them to one of the available Backend servers according to a scheduling algorithm. We can use dedicated hardware and any load balancing software for load balancing Mod_proxy_balancer- : Apache web server\u2019s module of mod_proxy_balancer the apache module developed to provide to load balancing […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/1266"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1266"}],"version-history":[{"count":2,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/1266\/revisions"}],"predecessor-version":[{"id":1269,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/1266\/revisions\/1269"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1266"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}