On Apr 11, 2011, at 12:45 PM, János Löbb wrote:
Hi,
/Tomcat 7.0.10, OSX 10.6.5, jk 1.2.31, and httpd 2.2.17/
Without any explicit parameters in server.xml, just by setting the jvmRoute
attribute in the Engine element and enabling Clustering, session failover
worked if I shut down one or the other tomcat instance or the one httpd that
was not the reverse proxy.
However when I just stopped the example webapp in one tomcat, the session did
not failover and I received a 404 http error instead of the expected session
page from the other tomcat.
Based upon the instructions found in the book:
http://proquest.safaribooksonline.com/9780596101060/tomcat_6_clustering_implementation?sessionid=reader=htmlimagepage=
explicitely:
nyissz
You'll also need to add distributed=true to the webapp's Context element.
If there is no Context element declared for it anywhere, you will need to
create one. You can create one by making a
newCATALINA_HOME/conf/[EngineName]/[HostName]/examples.xml context XML
fragment file or by adding one to server.xml.
nyassz
my thought was that the ReplicatedContect was not initiated. Well, I already
learned that I should not add any context into server.xml and there is
nothing in the
bml0066:local administrator$ ls -l tomcat1/conf/Catalina/localhost/
bml0066:local administrator$
directory, so I created a META-INF directory inside the examples directory
and placed a context.xml there with the following content:
bml0066:local administrator$ cat
tomcat1/webapps/examples/META-INF/context.xml
?xml version=1.0 encoding=UTF-8?
Context className=org.apache.catalina.ha.context.ReplicatedContext
distributed=true
/Context
I did it on both tomcats and bounced them. Now when I look the log, I see
the following warning just after restart:
INFO: Deploying web application directory examples
Apr 11, 2011 12:00:28 PM org.apache.catalina.startup.SetContextPropertiesRule
begin
WARNING: [SetContextPropertiesRule]{Context} Setting property 'distributed'
to 'true' did not find a matching property.
Apr 11, 2011 12:00:28 PM
org.apache.catalina.tribes.tipis.AbstractReplicatedMap init
INFO: Initializing AbstractReplicatedMap with context name:/examples
Apr 11, 2011 12:00:28 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Apr 11, 2011 12:00:28 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
So the first question is, should I use the distributed=true property here ?
Is the book right ? I think it is from 2007. I already have the
distributable/ tag in the webapp's web.xml.
The second question is what to do to avoid the 404 message and fail the
session over instead of it, when I just stop the webapp on the tomcat
instance? By default I am using sticky sessions.
nyissz
bml0066:local administrator$ cat apache2/conf/workers.properties
worker.list = lb,jkstatus
worker.lb.type=lb
worker.lb.balance_workers=tomcat1,tomcat3
#,tomcat2,tomcat4
worker.lb.sticky_session = True
worker.lb.sticky_session_force = False
worker.jkstatus.type=status
worker.tomcat1.type = ajp13
worker.tomcat1.host = bml0066.yalepath.org
worker.tomcat1.port = 8109
worker.tomcat1.lbfactor = 1
worker.tomcat1.redirect=tomcat3
#worker.tomcat2.type = ajp13
#worker.tomcat2.host = bml0066.yalepath.org
#worker.tomcat2.port = 8209
#worker.tomcat2.lbfactor = 1
#worker.tomcat2.redirect=tomcat4
worker.tomcat3.type = ajp13
worker.tomcat3.host = bml0065.yalepath.org
worker.tomcat3.port = 8309
worker.tomcat3.lbfactor = 1
worker.tomcat3.redirect=tomcat1
#worker.tomcat4.type = ajp13
#worker.tomcat4.host = bml0065.yalepath.org
#worker.tomcat4.port = 8409
#worker.tomcat4.lbfactor = 1
#worker.tomcat4.redirect=tomcat2
nyassz
Thanks ahead,
János
Testing out he examples webapp I found this in the log of that tomcat where I
shut down the webapp:
nyissz
INFO: Server startup in 6625 ms
Apr 11, 2011 12:43:59 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
sessionCreated('1CAEC5FA2D27A7410C819A8BBF9E7F77.tomcat1')
Apr 11, 2011 12:47:23 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
sessionCreated('69EB2E77CE0D912F8584E60B4CB828D7.tomcat3')
Apr 11, 2011 12:47:46 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeAdded('69EB2E77CE0D912F8584E60B4CB828D7.tomcat3', 's1', 't3')
Apr 11, 2011 12:48:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Associated with Deployer
'Catalina:type=Deployer,host=localhost'
Apr 11, 2011 12:48:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Global resources are available
Apr 11, 2011 12:48:54 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
Apr 11, 2011 12:49:01 PM
