Load Balancing to Tomcat Workers

Discussion:

Loai Abdallatif

2018-10-03 20:07:12 UTC

Hello,

I have configures web server with jk load balancer to tomcat server
(192.168.237.11) with two containers worker 0, worker1)
the problem is that the web application session seems keep rotating between
both workers but I need session stickeness, means the client will be
connected to the same worker which doesn't occur ,

the workers.properties file has this content :
worker.list=EVOUCHER_LB, jk-status, jk-manager, EVOUCHER_LB
# Define worker0 -- appserver1
worker.worker_app1.type=ajp13
worker.worker_app1.host=192.168.237.11
worker.worker_app1.port=8009
worker.worker_app1.socket_timeout=1200
worker.worker_app1.connection_pool_size=1
worker.worker_app1.connection_pool_timeout=1300
worker.worker_app1.lbfactor=1
worker.worker_app1.redirect=worker_app2
worker.worker_app1.sticky_session=1
#############################################################
#Define worker1 -- appserver1
worker.worker_app2.type=ajp13
worker.worker_app2.host=192.168.237.11
worker.worker_app2.port=8109
worker.worker_app2.socket_timeout=1200
worker.worker_app2.connection_pool_size=1
worker.worker_app2.connection_pool_timeout=1300
worker.worker_app2.lbfactor=1
worker.worker_app2.redirect=worker_app1
worker.worker_app2.sticky_session=1

Christopher Schultz

2018-10-03 20:40:25 UTC

Permalink

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Loai,

Post by Loai Abdallatif
Hello,
I have configures web server with jk load balancer to tomcat
server (192.168.237.11) with two containers worker 0, worker1) the
problem is that the web application session seems keep rotating
between both workers but I need session stickeness, means the
client will be connected to the same worker which doesn't occur ,

Sticky sessions are the default.

Post by Loai Abdallatif
worker.list=EVOUCHER_LB, jk-status, jk-manager, EVOUCHER_LB #
Define worker0 -- appserver1 worker.worker_app1.type=ajp13
worker.worker_app1.host=192.168.237.11
worker.worker_app1.port=8009
worker.worker_app1.socket_timeout=1200
worker.worker_app1.connection_pool_size=1
worker.worker_app1.connection_pool_timeout=1300
worker.worker_app1.lbfactor=1
worker.worker_app1.redirect=worker_app2
worker.worker_app1.sticky_session=1

You haven't specified a route name. Is the jvmRoute for your
192.168.237.11 set to "worker_app1"? If not, you'll have to set
worker.worker_app1.route=routeName and do the same in your <Engine>
for your jvmRoute attribute.

Post by Loai Abdallatif
#############################################################
#Define worker1 -- appserver1 worker.worker_app2.type=ajp13
worker.worker_app2.host=192.168.237.11
worker.worker_app2.port=8109
worker.worker_app2.socket_timeout=1200
worker.worker_app2.connection_pool_size=1
worker.worker_app2.connection_pool_timeout=1300
worker.worker_app2.lbfactor=1
worker.worker_app2.redirect=worker_app1
worker.worker_app2.sticky_session=1

Same here.

Read the workers.properties documentation[1] for these settings just
to make sure you understand everything before you start changing
things. Specifically, read the introduction to the "Load Balancing
Directives" section (which specifically, in RED TEXT, warns you about
setting these parameters and making sure they agree). Read about the
"route" attribute and also read about "redirect" (which shouldn't be
necessary unless there is a specific reason to fail-over to one worker
specifically, as opposed to one in particular). The only use-case I
can think of for "redirect" is when you are using the BackupManager
for session-clustering.

Hope that helps,
- -chris

[1] http://tomcat.apache.org/connectors-doc/reference/workers.html
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Rainer Jung

2018-10-04 07:35:36 UTC

Permalink

Just adding a bit below ...

Post by Christopher Schultz
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Loai,

Sticky sessions are the default.

I don't see a balancer worker defined (type lb) and configured. Some of
the attributes you set belong to a balancer worker. I suggest reading

http://tomcat.apache.org/connectors-doc/common_howto/loadbalancers.html

The point about setting jvmRoute in your Tomcat's server.xml is very
important.

A good starting point for a mod_jk config is here:

http://svn.apache.org/viewvc/tomcat/jk/trunk/conf/

The files are also contained in the source release of mod_jk available under

https://tomcat.apache.org/download-connectors.cgi

Regards,

Rainer

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loai.abdallatif

2018-10-04 08:11:36 UTC

Permalink

Thanks very much Rainer . I will check deeply what you said . Thanks againÂ

Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Rainer Jung <***@kippdata.de> Date: 10/4/18 10:35 AM (GMT+02:00) To: Tomcat Users List <***@tomcat.apache.org> Subject: Re: Load Balancing to Tomcat Workers
Just adding a bit below ...

Post by Christopher Schultz
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Hash: SHA256
Loai,

Post by Loai Abdallatif
Hello,
I have configures web server with jk load balancer to tomcat
server (192.168.237.11) with two containersÂ worker 0, worker1) the
problem is that the web application session seems keep rotating
between both workers but I need session stickeness, means the
client will be connected to the same worker which doesn't occur ,

Sticky sessions are the default.