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leave_britney_alone
Asked: 2010-12-16 18:39:19 +0800 CST

dns with Round-robin a two web servers

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i have two webservers and the next zone

web1.example.org IN A 10.0.0.1
web2.example.org IN A 10.0.0.2

example.org IN CNAME web1.example.org
example.org IN CNAME web2.example.org

The problem its the php session, you go to web1.example.org and later the dns responds web2.example.org.

How can i fix this?

domain-name-system web-server

2 Answers

  1. Best Answer

    You either need a persistent session store that's not on either server's local disk (e.g. a database or a network volume) or you need to ditch the round-robin approach and implement a load balancer intelligent enough to keep sending each client to the same server in the cluster.

    Round-robin is a bad idea for availability anyway -- if one server fails, you're redirecting half of your traffic to a dead system.

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  2. If you do not want the load to be evenly spread across your servers I would suggest configuring the TTL based on your users sessions to ensure that connections will most likely stay pointed at any given web server.

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