Mladen Turk schrieb:
Eddie Yee wrote:
Hi,
We use a combination of Tomcat 5.5.25, mod_jk (v1.25) and sun one web
server (v6.1). The Sun Java web server points to 5 instances of
tomcat as specified in our obj.conf and worker.properties.
I know that currently if the application is not in a started state and
Tomcat is up and running, mod_jk will still send traffic to that
instance. Is there any way to prevent sending traffic to an
application in a stopped state, or is this behavior by design, or just
bad configuration?
Mod_jk doesn't have per-application configuration.
However you can create multiple load balancers each pointing
to the same set of nodes and then mount each balancer
to each particular application.
When the application is down, you disable the entire
load balancer.
Of course this is feasible only for a small set of applications.
Regards
Adding to Mladen's answer: if you have only one app per Tomcat, you can
use the activation attribute of an LB member (active, disabled, stopped)
to tell the LB, if it should send requests to the member. Look at
"activation" in
http://tomcat.apache.org/connectors-doc/reference/workers.html
Another possibility is to use the attribute fail_on_status with a value
of 503, because an existing but stopped Tomcat context will answer
requests with http 503. You could check, whether 503 or -503 suites you
better. See the same docs page.
Starting from 1.2.27 there will also be a possibility to express an
activation state in the mapping table uriworkermap.properties, which
would allow to disable or stop a forwarding per URL and per node.
Unfortunately the nsapi plugin doesn't actually support the forwarding
via uriworkermap.properties. It only allows setting the uri to worker
map via NameTrans in obj.conf. Something we could improve, but at the
moment there seems to be no huge interest in the nsapi plugin.
Regards,
Rainer
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