Re: How to detect tomcat down

[Antonio Fiol Bonn�n]

Hi,

You are looking for "lb" type workers (even if you did not know). Look for that in Tomcat docs.

In short:

JkMount /* balancer

worker.balancer.type=lb
worker.balancer.workerlist=tomcat1worker,tomcat2worker

(I am not sure about the "workerlist" word. It might be "workers" or "list"... Search for an example in your sample workers.properties)

Antonio Fiol

Simon Zeng wrote:

It seems working !!! However, I have a problem with the configuration.

All my tomcat workers share the same code base and is ready to handle all
the requests in load balance mode. I want something like this:
   JkMount /* tomcat1worker
   JkMount /* tomcat2worker

However, it only pick up tomcat2worker. For example, if I have tomcat2 down
and tomcat1 up. The mod_jk.log always give me error for tomcat2 without
going to tomcat1.

Is there any way to solve this? Many thanks.
-Simon

-----Original Message-----
From: Tim Funk [mailto:[EMAIL PROTECTED]
Sent: Wednesday, May 19, 2004 10:43 AM
To: Tomcat Users List
Subject: Re: How to detect tomcat down

(Syntax below is not exactly correct, but has the right idea)

Assuming you loadlancer worker is named loadbalanceworker which has workers tomcat1worker and tomcat2worker

Instead of
JkMount *.jsp loadbalanceworker

Try this
JkMount /testworker1page tomcat1worker
JkMount /testworker2page tomcat2worker

-Tim

Simon Zeng wrote:

Could you please explain what do you mean special (hidden) and how to do

it?

Currently I only define on JkMount for loadbalancer. Thanks, -Simon

-----Original Message-----
From: Tim Funk [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 18, 2004 7:54 PM
To: Tomcat Users List
Subject: Re: How to detect tomcat down

For the load balanced tests, have a special (hidden) JkMount for each

tomcat

in the cluster.

-Tim

Simon Zeng wrote:

I can come up with a WatchDog to do the monitoring/restart. But We have a
few tomcat instance runing in load balance mode with one Apache

dispatching

request to them. How could we figure out if one/more(not all) tomcat
instances down and how to decide which ones they are? Basically the

question

is can we bypass Apache to go directly to Tomcat since we know where they
are?

Thanks,
-Simon

-----Original Message-----
From: QM [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 18, 2004 4:40 PM
To: Tomcat Users List
Subject: Re: How to detect tomcat down

On Tue, May 18, 2004 at 03:04:28PM -0400, Simon Zeng wrote:
: I am running Apache 2.0.47 and Tomcat 4.1.24 on Win2K/NT. I would like

to

: monitor the tomcat : server and restart it automatically if it is detected down. I did a lot
: research but could not find any convincing way to do it.

Some commercial monitoring products perform a request to an
(unprotected) URI and, in the event of a failure, perform some specified
action. -that is, call the start script.

Otherwise, you could have Tomcat started by a (custom) watchdog, the
idea being that it kicks the start script if the expected process isn't
running.  I recall iPlanet 4 did something similar.

As for free + out-of-the-box solutions, I haven't seen any...

-QM

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]

smime.p7s

Description: S/MIME Cryptographic Signature