How to add a clustering node?

[allen_lei]

Hi,
I have a worker.properties define like this:

worker.list=loadbalancer,status

# Define Node 1
worker.node1.port=8009
worker.node1.host=192.168.0.101
worker.node1.type=ajp13
worker.node1.lbfactor=1

# Define Node 2
worker.node2.port=8009
worker.node2.host=192.168.0.102
worker.node2.type=ajp13
worker.node2.lbfactor=1

# Load-balancing behaviour
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=node1,node2
worker.loadbalancer.sticky_session=true

worker.status.type=status
worker.list=jkstatus
worker.jkstatus.type=status

Then I want to add a new JBoss instance(node3),and apache httpd is in running.How can I add a new worker node without stop and start apache?Does jk support dynamic load the worker.properties?If so,how to configure it?Or some other suggests?Thank you!

[brian.stansberry]

Just update the file and save it. The status worker rescans the file every 60 secs and updates the server.

[allen_lei]

Just update the file and save it. The status worker rescans the file every 60 secs and updates the server.

Thanks for your suggestion.I tried it by removing a node from the loadbalancer's balance_workers,and then after several minutes,I found there also existed requests forward to the removed node.But this didnt happen when I restarted Apache manually.It seems that the status worker not rescans the file every 60 secs.

Something wrong?Your reply would be very appreciated.

PS:My testing environment is Windows xp sp2 + Apache 2.2.11.

[brian.stansberry]

My apologies. I've had that "just update workers.properties" idea in my head for a long time, don't know where it came from, but it's just wrong.

A couple suggestions for you:

1) If you are using JBoss 5, try mod_cluster

http://www.jboss.org/mod_cluster/

One of the primary motivations for its creation was the dynamic registration / unregistration of backend nodes as they come and go.

2) Restart httpd gracefully

apache -k graceful

See "Graceful Restart" section of http://httpd.apache.org/docs/2.2/stopping.html for more on what that does.

[allen_lei]

I see,thanks.

I'm now using JBoss 4.x and hava not used JBoss 5 yet.So I will try the JBoss 5 with mod_cluster later.

I think "gracefully restart apache" is a appropriate idea for now.