I am trying to get JK 1.2.8 (within Apache 2.0.52 SSL build) to fail
over to my remaining Tomcat 5.5.7 instance when the first instance is
brought down (e.g. for maintenance or due to an actual failure).
The application uses container managed authentication (CMA) and
obviously sessions.
I have two questions/problems. Thanks so much for any ideas/help you can
provide.
1) If I set sticky_session=True then the loadbalancer worker distributes
requests among the two workers just fine. If I shut down one Tomcat
instance, it redirects me to the second - but I am prompted to login
again. This makes me think that session replication is not occurring.
How can I check that session replication is happening (is there a log
settings)?
I thought it must be at first as I was getting the following in my
tomcat logs:
>From srv1:
INFO main org.apache.coyote.http11.Http11Protocol - Initializing Coyote
HTTP/1.1 on http-8080
INFO main org.apache.catalina.startup.Catalina - Initialization
processed in 875 ms
INFO main org.apache.catalina.core.StandardService - Starting service
Catalina
INFO main org.apache.catalina.core.StandardEngine - Starting Servlet
Engine: Apache Tomcat/5.5.7
INFO main org.apache.catalina.core.StandardHost - XML validation
disabled
INFO main org.apache.catalina.cluster.tcp.SimpleTcpCluster - Cluster is
about to start
INFO main org.apache.catalina.cluster.mcast.McastService - Sleeping for
2000 secs to establish cluster membership
INFO main org.apache.catalina.cluster.deploy.FarmWarDeployer - Cluster
FarmWarDeployer started.
INFO main org.apache.coyote.http11.Http11Protocol - Starting Coyote
HTTP/1.1 on http-8080
INFO main org.apache.jk.common.ChannelSocket - JK2: ajp13 listening on
/0.0.0.0:8009
INFO main org.apache.jk.server.JkMain - Jk running ID=0 time=0/31
config=null
INFO main org.apache.catalina.storeconfig.StoreLoader - Find registry
server-registry.xml at classpath resource
INFO main org.apache.catalina.startup.Catalina - Server startup in 6016
ms
INFO Cluster-MembershipReceiver
org.apache.catalina.cluster.tcp.SimpleTcpCluster - Replication member
added:org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.1.140:
4002,192.168.1.140,4002, alive=16]
>From srv2:
INFO main org.apache.coyote.http11.Http11Protocol - Initializing Coyote
HTTP/1.1 on http-9080
INFO main org.apache.catalina.startup.Catalina - Initialization
processed in 1250 ms
INFO main org.apache.catalina.core.StandardService - Starting service
Catalina
INFO main org.apache.catalina.core.StandardEngine - Starting Servlet
Engine: Apache Tomcat/5.5.7
INFO main org.apache.catalina.core.StandardHost - XML validation
disabled
INFO main org.apache.catalina.cluster.tcp.SimpleTcpCluster - Cluster is
about to start
INFO main org.apache.catalina.cluster.mcast.McastService - Sleeping for
2000 secs to establish cluster membership
INFO Cluster-MembershipReceiver
org.apache.catalina.cluster.tcp.SimpleTcpCluster - Replication member
added:org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.1.140:
4001,192.168.1.140,4001, alive=5578]
INFO main org.apache.catalina.cluster.deploy.FarmWarDeployer - Cluster
FarmWarDeployer started.
INFO main org.apache.coyote.http11.Http11Protocol - Starting Coyote
HTTP/1.1 on http-9080
INFO main org.apache.jk.common.ChannelSocket - JK2: ajp13 listening on
/0.0.0.0:9009
INFO main org.apache.jk.server.JkMain - Jk running ID=0 time=0/31
config=null
INFO main org.apache.catalina.storeconfig.StoreLoader - Find registry
server-registry.xml at classpath resource
INFO main org.apache.catalina.startup.Catalina - Server startup in 6313
ms
2) If I set sticky_session=False I am unable to login, failing with an
HTTP Status 408. Here's the sequence:
a) Issue a request to a protected resource that will trigger
form-based authentication (CMA). JK worker loadbalancer sends this
request to the first worker, "srv1".
b) After I fill in the authentication/login form I press submit. Now
JK worker loadbalancer send this request to worker "srv2" and I end up
with this error respons: HTTP Status 408 - The time allowed for the
login process has been exceeded...
Here are my configuration files (or pieces):
FILE: piece form httpd.conf
<IfModule mod_jk.c>
JkWorkersFile conf/workers.properties
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkLogFile logs/mod_jk.log
# Log level to be used by mod_jk: debug, info, warn error or trace
JkLogLevel debug
JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories
JkExtractSSL on
JkHTTPSIndicator HTTPS
JkSESSIONIndicator SSL_SESSION_ID
JkCIPHERIndicator SSL_CIPHER
JkCERTSIndicator SSL_CLIENT_CERT
</IfModule>
FILE: workers.properties
# workers.properties -
#
workers.tomcat_home=c:/jakarta-tomcat-5.5.7
workers.java_home=C:/jdk1.5.0_01
ps=/
#
# Define one worker for each tomcat instance, plus one
# to handle the load balancing.
#
worker.list=loadbalancer
worker.srv1.port=8009
worker.srv1.host=localhost
worker.srv1.type=ajp13
worker.srv1.lbfactor=100
worker.srv1.sticky_session=False
worker.srv1.local_worker=0
worker.srv2.port=9009
worker.srv2.host=localhost
worker.srv2.type=ajp13
worker.srv2.lbfactor=100
worker.srv2.sticky_session=False
worker.srv2.local_worker=0
worker.loadbalancer.type=lb
worker.loadbalancer.sticky_session=False
worker.loadbalancer.balanced_workers=srv1,srv2
worker.loadbalancer.local_worker_only=1
FILE: piece from server.xml on "srv1"
(note: I do not want automated deployment so I watchEnabled="false", I
do not want farm deployment to occur)
<Cluster
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.D
eltaManager"
expireSessionsOnShutdown="true"
useDirtyFlag="true"
notifyListenersOnReplication="true">
<Membership
className="org.apache.catalina.cluster.mcast.McastServic
e"
mcastAddr="228.0.0.4"
mcastPort="45564"
mcastFrequency="500"
mcastDropTime="3000"/>
<Receiver
className="org.apache.catalina.cluster.tcp.ReplicationLi
stener"
tcpListenAddress="auto"
tcpListenPort="4001"
tcpSelectorTimeout="100"
tcpThreadCount="6"/>
<Sender
className="org.apache.catalina.cluster.tcp.ReplicationTr
ansmitter"
replicationMode="pooled"
ackTimeout="15000"/>
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.ht
ml;.*\.css;.*\.txt;"/>
<Deployer
className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
tempDir="c:/jakarta-tomcat-5.5.7/temp"
deployDir="c:/jakarta-tomcat-5.5.7/webapps"
watchDir="c:/jakarta-tomcat-5.5.7-deployer/build/w
ebapp"
watchEnabled="false"/>
</Cluster>
FILE: piece from server.xml on "srv2"
<Cluster
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.D
eltaManager"
expireSessionsOnShutdown="true"
useDirtyFlag="true"
notifyListenersOnReplication="true">
<Membership
className="org.apache.catalina.cluster.mcast.McastServic
e"
mcastAddr="228.0.0.4"
mcastPort="45564"
mcastFrequency="500"
mcastDropTime="3000"/>
<Receiver
className="org.apache.catalina.cluster.tcp.ReplicationLi
stener"
tcpListenAddress="auto"
tcpListenPort="4002"
tcpSelectorTimeout="100"
tcpThreadCount="6"/>
<Sender
className="org.apache.catalina.cluster.tcp.ReplicationTr
ansmitter"
replicationMode="pooled"
ackTimeout="15000"/>
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.ht
ml;.*\.css;.*\.txt;"/>
<Deployer
className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
tempDir="c:/jakarta-tomcat-5.5.7b/temp"
deployDir="c:/jakarta-tomcat-5.5.7b/webapps"
watchDir="c:/jakarta-tomcat-5.5.7-deployer/build/w
ebapp"
watchEnabled="false"/>
</Cluster>
Thanks again - Richard
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