You'll probably want to use mod_proxy_ajp I've had pretty good success
with it. I'm not sure why you would be using an active-hot standby-hot
standby instead of active-active-hot standby but who am I to judge =o)
Get a configuration working with it first on one server then work
towards the hot stand bys
Your apache load balancing config will look like this if you want to use
mod_proxy_ajp:
<VirtualHost *:80>
ServerName www.mydomain.com
DocumentRoot /www/www.mydomain.com/html
ReWriteEngine on
# will preserve the host name in the request so you can use virtual
# domains on the apache side
ProxyPreserveHost On
# prevents reverse proxying
ProxyRequests Off
ProxyVia Off
# proxy rewrite rule
ProxyPass / balancer://hotcluster/
<Proxy balancer://hotcluster>
BalancerMember ajp://1.2.3.4:8009 loadfactor=1
# The below servers are the hot standbys
BalancerMember ajp://1.2.3.5:8009 status=+H
BalancerMember ajp://1.2.3.6:8009 status=+H
ProxySet lbmethod=bytraffic
</Proxy>
</VirtualHost>
You can also use straight up mod_proxy by changing the ajp:// references
to http:// and change the ports 8009 to 8080. I believe if you do so it
will not scale as well because the AJP interface transfers data from
Tomcat to Apache HTTP via a binary format versus the straight up text
interface.
Hope this helps,
Chris Berthold
-----Original Message-----
From: Anil Ranka [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 28, 2006 9:50 AM
To: users@tomcat.apache.org
Subject: Help with Tomcat Clustering and load balancing
Hi All,
I am new with Tomcat Clustering feature. I have configured my three
tomcats nodes in cluster mode and they are talking to each other no
issues.
Out these three nodes N1, N2 and N3 only one node will be ACTIVE node
and
rest two will be PASSIVE. ACTIVE means my app will be loaded on only one
node. When this ACTIVE node goes down, using clustering mechanism I am
able
to load my APP on next node from list. This scenario works very well.
!!!!
NO ISSUES!!!
Now to out side world I have to give URL so that they can submit jobs to
this clustered nodes. Here I get lost. I am assuming I need load
balancer/proxy will which will route my request to ACTIVE node.
My question is : How to configure load balancer/proxy server to rote my
request to any specific ACTIVE node.
I tries tomcat web apps load balance, it does url redirect and I loose
my
request data.
Any help/pointer will be highly appreciated.
Thanks
Anil S. Ranka
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