[jboss-user] [Clustering/JBoss] - Affinity and Failover

[diegom]

Hello

I have a problem configuring session affinity and failover in a web application
I'm using apache httpd 2.2, jboss 4.2.3, and mod_jk.1.2.27

The affinity works fine, until a node goes down.  At this moment, failover happens and the httpd server redirects to other (alive) node, but it doesn't set the affinity (¿JSESSIONID cookie?) to this new node.

In all the JBoss nodes I set :

In jboss-web.deployer/META-INF/jboss-service.xml
<attribute name="UseJK" replace="true" trim="true">true</attribute>
In jboss-web.deployer/server.xml
<Engine name="jboss.web" defaultHost="localhost" jvmRoute="nodeX">
with diferent jvmRoute names for each node (in concordance with worker's names)

The mod-jk.conf file looks similar to this


  | # Load mod_jk module
  | LoadModule jk_module modules/mod_jk-1.2.27-httpd-2.2.10.so
  | 
  | # Where to find workers.properties
  | JkWorkersFile conf/workers.properties
  | 
  | # Where to put jk logs
  | JkLogFile logs/mod_jk.log
  | 
  | # Set the jk log level [debug/error/info]
  | JkLogLevel info
  | 
  | # Select the log format
  | JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
  | 
  | # JkOptions indicates to send SSK KEY SIZE
  | JkOptions +ForwardKeySize +ForwardURICompatUnparsed -ForwardDirectories
  | 
  | # JkRequestLogFormat
  | JkRequestLogFormat "%w %V %T"
  | 
  | # You can use external file for mount points.
  | JkMountFile conf/uriworkermap.properties
  | 
  | # Add shared memory.
  | JkShmFile logs/jk.shm
  | 
  | # Add jkstatus for managing runtime data
  | <Location /jkstatus >
  | JkMount jkstatus
  | Order deny,allow
  | Deny from all
  | Allow from all
  | </Location>
  | 

And the workers.properties looks like this

  | worker.list=loadbalancer,jkstatus
  | 
  | worker.jkstatus.type=status
  | 
  | # Define Node 1
  | worker.node1.port=<port>
  | worker.node1.host=<ip>
  | worker.node1.type=ajp13
  | worker.node1.lbfactor=1
  | 
  | # Define Node 2
  | worker.node2.port=<port>
  | worker.node2.host=<ip>
  | worker.node2.type=ajp13
  | worker.node2.lbfactor=1
  | 
  | # etc for more nodes...
  | 
  | # Load-balancing behaviour
  | worker.loadbalancer.type=lb
  | worker.loadbalancer.balance_workers=node1,node2,<etc...>
  | worker.loadbalancer.sticky_session=1
  | worker.loadbalancer.retries=<number of nodes>
  | 

I think the problem is related to the JSESSIONID cookie which doesn't change after failover

What am I doing wrong?

Thanks in advance

PS: excuse my English, but I am a spanish speaker :-)



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