Re: Tomcat balanced to instance before its ready - any API to control when its re-balanced?

[Luca Toscano <toscano.luca@xxxxxxxxx>]

Hi Wayne,

2017-03-23 16:28 GMT+01:00 Wayne W <waynemailinglists@xxxxxxxxx>:

Hi,

I have apache 2.4 setup in a 2 node balancer configuration:

ProxyPass / balancer://cluster/ stickysession=JSESSIONID nofailover=Off

<Proxy balancer://cluster/>

       Order allow,deny

       Allow from all

       BalancerMember ajp://127.0.0.1:8009 route=g1

       BalancerMember ajp://127.0.0.1:8010 route=g2

 </Proxy>

When I bring one of the tomcats down traffic is balanced correctly to the other instance. However when starting up the tomcat instance again, I'm observing Apache routing traffic to the tomcat instance thats starting up too early and the browser sits there whirling away until the web app is fully deployed.

I'm aware of the balancer-manager, but is there away I can script apache when the node is balanced to again? There doesn't seem to be an API or way, other than using the balancer-manager interface manually.

have you checked https://httpd.apache.org/docs/current/mod/mod_proxy_hcheck.html? It might be useful to add (app-level) health check to the backends to "warm" them up before serving real client traffic.

Hope that helps!

Luca