Hi,
I use Apache as the load balancer and configured mod_jk to work in
failover mode. The master and slave run on separate machines.
To test how the failover works, I shut down the master machine, then I
access my application. But it takes about one minute for me to see the
first page. I think the time is used to try to establish the socket
connection.
I think I need to configure something that I missed in the
worker.properties so that mod_jk could detect the status of the master
before it sends the request to it.
Thanks for your help very much.
I use Apache HTTPD 2.2.4, mod_jk 2.2.4, JBoss 4.0.4/Tomcat 5.5.
The following the log of mod_jk.
[Wed Aug 22 17:24:59 2007][1632:1624] [info] mod_jk.c (2775):
mod_jk/1.2.24 initialized
[Wed Aug 22 17:25:42 2007][1632:6124] [info] jk_connect.c (473): connect
to 192.168.225.195:8009 failed (errno=60)
[Wed Aug 22 17:25:42 2007][1632:6124] [info] jk_ajp_common.c (891):
Failed opening socket to (192.168.225.195:8009) (errno=60)
[Wed Aug 22 17:25:42 2007][1632:6124] [info] jk_ajp_common.c (1311):
(master) error connecting to the backend server (errno=60)
[Wed Aug 22 17:25:42 2007][1632:6124] [info] jk_ajp_common.c (2071):
(master) sending request to tomcat failed, recoverable operation
attempt=1
The following is the content of worker.properties.
# Define list of workers that will be used
# for mapping requests
worker.list=loadbalancer,status
# Define Master
worker.master.host=192.168.225.195
worker.master.port=8009
worker.master.type=ajp13
worker.master.lbfactor=1
worker.master.cachesize=10
worker.master.cache_timeout=600
worker.master.socket_timeout=180
worker.master.recycle_timeout=100
worker.master.prepost_timeout=50
worker.master.recovery_options=0
# Define prefered failover node for master
worker.master.redirect=slave
# Define Slave
worker.slave.host= 192.168.225.116
worker.slave.port=8009
worker.slave.type=ajp13
worker.slave.lbfactor=1
worker.slave.cachesize=10
worker.slave.cache_timeout=600
worker.slave.socket_timeout=180
worker.slave.recycle_timeout=100
worker.slave.prepost_timeout=50
worker.slave.recovery_options=0
#Disable slave for all requests except failover
worker.slave.activation=disabled
# Load-balancing behaviour
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=master, slave
worker.loadbalancer.sticky_session=1
# Status worker for managing load balancer
worker.status.type=status
