[LUG] have a look ;-)

Tue, 12 Jul 2005 23:17:23 -0700 


http://www.redhat.com/sundown/techquestion0615.html

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Title: redhat.com | Home

IBM and Red Hat Solaris Migration Center

Tech Challenge June 15

Winner: Florin Malita

The Scenario

The only thing that is constant is change. Although the statement is rather glib, it is also fortunate: as you have been promoted to replace the previous network administrator. This is an exciting point in your life: a new job, a new city, and a new relationship (not to drop names, but your new interest has the initials NFS.) The departure of your predecessor was very abrupt and the network setup they left behind was rather unorthodox. The first order of business is to get the network properly configured as your http server is being overwhelmed with requests.

Your Tux static content server is connected to your static php, cgi-script disk, assume that the disk is high-availability, and is also connected to a http server and a https server. The problem is that the http server is being overwhelmed while the load on the https box is nominal. Both the http server and the https server are connected to tomcat servers which are accessing a db2 storage array.

[Click here for a graphical representation of the current configuration. Numbers provided are relative measurements of load stress. In regards to my drawing abilities...I know...I know]

The Question

  1. Assume that you are allowed to re-purpose the existing Tux machine and add four additional servers. A Cisco router is available to port forward https and http traffic to different machines. However, it can not do load balancing on its own. How would you distribute the http load using Red Hat solutions (i.e. no third party software)?

The Answer

  1. LVS/IPVS load balancing as provided by the Red Hat Cluster Suite.

    Turn the TUX box into an LVS load balancer

    Of the 4 available systems, add 3 more HTTP servers and one more HTTPS server

    Configure the TUX/LVS box to balance 2 virtual services: HTTP (4 real servers) and HTTPS (2 real servers)

    This should bring the load down at about +3 on the HTTP servers and +2 on the HTTPS servers.

    Click here for a graphical representation of the answer.

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