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Struts & Hibernate
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| | | mod_jk sticky sessions don 't work | mod_jk sticky sessions don 't work 2007-08-02 - By Claudio Tassini
Back
Hi all!
I'm trying to configure mod_jk to handle balance two apache-tomcat instances
through an Apache "reverse proxy", i read all the documentation, reference
guides and howtos i found but it still doesn't work...
Below are some configuration I'm using. The symptoms are that I connect with
a browser to a jsp page that prints out the tomcat server that is managing
the session, and the relative session ID. Every time I refresh the page, the
server name and the sessionID change.
I'm using apache httpd 2.2.4 build from source, mod_jk 1.2.23 and
apache-tomcat 5.5.23 . Now, this is the httpd.conf (relevant parts only):
JkWorkersFile /usr/local/apache2/conf/workers.properties
JkShmFile /usr/local/apache2/logs/mod_jk.shm
JkLogFile /usr/local/apache2/logs/mod_jk.log
JkLogLevel debug
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkOptions +ForwardKeySize +ForwardURICompatUnparsed -ForwardDirectories
JkRequestLogFormat "%w %V %T"
NameVirtualHost *:80
<VirtualHost *:80>
ServerName portal.domain.it
JkMount /status status
JkMount /* test
</VirtualHost>
The workers.properties:
worker.list=test
worker.portal1.port=8009
worker.portal1.host=inca-portal1
worker.portal1.type=ajp13
worker.portal1.lbfactor=1
worker.portal2.port=8009
worker.portal2.host=inca-portal2
worker.portal2.type=ajp13
worker.portal2.lbfactor=1
worker.test.type=lb
worker.test.balance_workers=portal1,portal2
worker.test.sticky_session=True
And, finally, I changed the tomcat server.xml file:
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009"
enableLookups="false" redirectPort="8443" protocol="AJP/1.3"
/>
<Engine name="Standalone" defaultHost="localhost" jvmRoute="portal1"
debug="1" />
Finally, this is a piece of the log saying that he founds a certain session
ID, and then he sends the request to the other server which then obviously
sets a new JSESSIONID... :
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
map_uri_to_worker::jk_uri_worker_map.c (589): Attempting to map URI
'/jsp-examples/sesstest.jsp' from 2 maps
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
map_uri_to_worker::jk_uri_worker_map.c (601): Attempting to map context URI
'/status=status' source 'JkMount'
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
map_uri_to_worker::jk_uri_worker_map.c (601): Attempting to map context URI
'/*=test' source 'JkMount'
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
map_uri_to_worker::jk_uri_worker_map.c (616): Found a wildchar match
'/*=test'
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] jk_handler::mod_jk.c (2111):
Into handler jakarta-servlet worker=test r->proxyreq=0
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
wc_get_worker_for_name::jk_worker.c (114): found a worker test
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
maintain_workers::jk_lb_worker.c (543): decay with 2^38
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
wc_get_name_for_type::jk_worker.c (290): Found worker type 'lb'
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] init_ws_service::mod_jk.c
(607): Service protocol=HTTP/1.1 method=GET host=(null) addr=192.168.10.2name=
portal.inca.it port=80 auth=(null) user=(null) laddr=192.168.10.201 raddr=
192.168.10.2
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] service::jk_lb_worker.c
(915): service sticky_session=1 id='64EEDE6D4E3C9EF3A2048741CDA5C189'
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
get_most_suitable_worker::jk_lb_worker.c (767): searching worker for partial
sessionid 64EEDE6D4E3C9EF3A2048741CDA5C189
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
get_most_suitable_worker::jk_lb_worker.c (819): found best worker portal2
(portal2) using method 'Request'
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] service::jk_lb_worker.c
(935): service worker=portal2 route=portal2
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
ajp_get_endpoint::jk_ajp_common.c (2343): acquired connection pool slot=0
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
ajp_marshal_into_msgb::jk_ajp_common.c (548): ajp marshaling done
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] ajp_service::jk_ajp_common.c
(1796): processing portal2 with 2 retries
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] ws_write::mod_jk.c (452):
written 274 out of 274
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
ajp_connection_tcp_get_message::jk_ajp_common.c (1043): received from ajp13
pos=0 len=2 max=8192
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
ajp_connection_tcp_get_message::jk_ajp_common.c (1043): 0000 05 01 00 00
00 00 00 00 00 00 00 00 00 00 00 00 - ................
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug]
ajp_process_callback::jk_ajp_common.c (1506): AJP13 protocol: Reuse is OK
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] ajp_done::jk_ajp_common.c
(2286): recycling connection pool slot=0 for worker portal2
[Thu Aug 02 16:52:09 2007] test portal.inca.it 0.005241
[Thu Aug 02 16:52:09 2007] [1970:44448] [debug] jk_handler::mod_jk.c (2238):
Service finished with status=200 for worker=test
Any help would be REALLY appreciated!
Fi
--
Claudio Tassini
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