Apache with mod_jk Tomcat change DNS Timeout (TTL)

Question

I'm using GSLB APP for geo-distribution and load-balancing.

The APP is Apache --> Tomcat througth mod_jk in workers.properties I have some like this:

worker.balancing.port=8009
worker.balancing.host=tomcats8009.gslb.domain.com
worker.balancing.type=ajp13
worker.balancing.socket_timeout=5

If Tomcat GSLB (tomcats8009.gslb.domain.com) changes from IP x.x.x.x to another IP y.y.y.y, the dns resolution seems to be cached by the connector mod_jk and the request are still asking to x.x.x.x .

For solving I have to make "reload" to renew the resolution y.y.y.y.

Any idea? is there any kind of DNS caching in Apache or mod_jk connector? solutions?

Thanks.
Regards.

Answer 1

I dont know if there is any property at mod_jk level but you can set it at the JDK level. Assuming you have Sun, the parameter would be "sun.net.inetaddr.ttl" ; setting it to zero would turn off dns caching. Generally this would not be recommended as turning off dns caching would affect performance.