The following example shows one way of connecting MDM Server instances by setting
up a load balancing solution using mod_jk with Apache Tomcat. It assumes that you
already have some experience of working with httpd and have some knowledge of Apache
Tomcat and Apache Tomcat connectors (mod_jk).
Such a cluster consists of one Apache server that dispatches all the
incoming requests across the cluster, and two "nodes", which are different instances of
MDM Server installed on the same machine.
Procedure
-
Edit the configuration file
<Apache_home>\conf\httpd.conf.
-
Add the following lines:
JkMount /talendmdm/* loadbalancer
JkMountCopy all
-
Create a new file worker.property and
populate it as follows:
Make sure the workers listed for worker.loadbalancer.balance_workers
correspond to names specified
for jvmRoute
in the file
<TomcatPath>/conf/server.xml because Apache
server will dispatch the requests based on the file
worker.property.
# Define mdm_node1
worker.mdm_node1.port=8109
worker.mdm_node1.host=127.0.0.1
worker.mdm_node1.lbfactor=1
worker.mdm_node1.type=ajp13
# Define mdm_node2
worker.mdm_node2.port=8009
worker.mdm_node2.host=127.0.0.1
worker.mdm_node2.lbfactor=1
worker.mdm_node2.type=ajp13
# Declare the load balancer itself and all the worker nodes
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=mdm_node1,mdm_node2
worker.list=mdm_node1,mdm_node2,loadbalancer
worker.loadbalancer.sticky_session=true
Note: You can find the AJP port of each
MDM server node in the file
<TomcatPath>/conf/server.xml. You need to
uncomment the AJP port configuration if it is commented out. One example is
shown
below:
<!-- Define an AJP 1.3 Connector on port 8109 -->
<Connector port="8109" protocol="AJP/1.3" redirectPort="8543" address="0.0.0.0" secretRequired="false" />
-
Restart the Apache server for the configuration to be taken into
account.