Hi Tim,
Tim Alberts schrieb:
I have 3 physical servers, all 3 running tomcat6 and the 2 web
applications (one for local, one for www) just fine. Two of these have
apache web servers (local and www), both configured and running static
content by themselves just fine.
Ideally, I want the 3 tomcat6 instances to be a lb cluster for the two
web servers. For reasons I don't understand, it isn't working. The
By cluster here we mean a farm (i.e. multiple nodes carrying the same
apps) but not session replication?
'local' web server will mount the lb cluster when I only have one
tomcat6 instance listed in the cluster. The 'www' web server won't
mount the cluster if it's 3 or 1 tomcat6 instance. It will mount a
tomcat6 instance without the cluster.
I seem to be lacking some understanding. Can multiple web servers
connect to tomcat6 with mod_jk at the same time, or do I need to
configure additional connectors for each connection?
No, what you are trying to achieve is very normal. The below config
tells us, that the URLs configured in JkMount are send to a load
balancing woker lb, and although you defined three ajp13 workers, the lb
only knows about one of them, "cartman". So lb should send all requests
to cartman.
If you can reproduce your problem with single requests, then you can set
your JkLogLevel to debug, restart the web server and send a single
request. The log file will tell you, what mod_jk configured during
startup, if it found a worker it will send the request to, and what it
got back from the worker. I assume, that you already checked, if you
have error messages in the JK log file?
If you add the other two members to the list of members of lb, can you
see them in the status worker?
Just in case one of the two web servers uses an even more recent version
of mod_jk: we made our vhost handling more strict. JkMounts now have to
be inside the VirtualHost (if you use them) or you must use JkMountCopy
to inherit mounts from the global server to a vhost.
Regards,
Rainer
Servers are Apache2.2.3 Tomcat6.0.14
mod_jk-1.2.23-apache-2.2.x-linux-x86_64.so
# workers.properties
#
# List workers
worker.list=lb,jkstatus
#
# Define cartman
worker.cartman.port=8009
worker.cartman.host=cartman.inside.msi
worker.cartman.type=ajp13
worker.cartman.socket_timeout=300
worker.cartman.lbfactor=1
#
# Define stan
worker.stan.port=8009
worker.stan.host=stan.inside.msi
worker.stan.type=ajp13
worker.stan.socket_timeout=300
worker.stan.lbfactor=1
#
# Define kyle
worker.kyle.port=8009
worker.kyle.host=kyle.inside.msi
worker.kyle.type=ajp13
worker.kyle.socket_timeout=300
worker.kyle.lbfactor=1
#
#
# Define lb
worker.lb.type=lb
worker.lb.sticky_session=True
worker.lb.sticky_session_force=False
worker.lb.balance_workers=cartman
#
# Define a 'jkstatus' worker using status
worker.jkstatus.type=status
Apache config file mounts the local applications like:
JkMount /localapp lb
JkMount /localapp/* lb
Apache config file mounts the www applications like:
JkMount /wwwapp lb
JkMount /wwwapp/* lb
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