Load Balancer is Single Point of Failure?

[burakbayramli]

Hi,

We have set up a JBoss cluster for our Servlets. We also read the literature on load balancing that recommends using "one" Apache (through mod_jk2) that distributes load among JBoss servers.

But this turns Apache into a single point of failure.

We would like to have two Apache servers. Both these guys will know about "both" JBoss servers.

Will this work? Do we need to put a DNS round robin in front of two Apache servers? How will session affinity work in this setup?

Thanks,

[anil.saldhana]

Use mod_jk1.2.x and not mod_jk2 (deprecated/unsupported).

You can use a hardware switch in front of the two apache instances. This switch should provide stickyness (ie. all requests from the same client go to the same apache).

[ricardoarguello]

We use a Cisco 11150:
http://www.cisco.com/en/US/products/hw/contnetw/ps789/ps791/

in front of a couple of Apache HTTP servers, proxying 4 Tomcat instances via AJP.

Ricardo

[burakbayramli]

Thank you very much