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This document is intended to describe the steps required to deploy Joget Workflow v5 Large Enterprise Edition (LEE) in a clustered environment for scalability and redundancy.
In order for clustering to work, the Large Enterprise Edition is required. The standard Enterprise Edition will not work due to licensing restrictions. Clustering requires several layers to be prepared and configured:
There are many ways to design the clustering architecture, but the core concepts will be similar. In this document, the architecture used is as follows:
This guide describes the steps required to setup Joget Workflow LEE clustering. The exact steps will depend on the actual products used in each layer.
|IMPORTANT: Please note that there is minimal configuration required in Joget Workflow LEE itself, and almost all the work is done on the separate layers so it is vital to ensure that you have sufficient expertise in your chosen products.|
Before the clustering installation can be done, the following prerequisites are needed:
Common directory to be accessed by the application servers with read/write permissions. This directory is used to store shared configuration files, system generated files, and uploaded files. Verify that the shared directory is mounted on the application servers and that files can be accessed with read and write permissions.
Common database to be accessed by the application servers with permission to select, update, delete, create and alter tables. Verify that the application servers can connect and query the shared database.
Java web application server to be installed and running on each server in the cluster. Verify that each application server has been installed correctly and can be accessed with a web browser.
Session replication to be configured on the application servers and network. Verify that session replication has been configured for each application server and the network.
Load balancer (hardware or software) to be installed and configured to direct traffic for requests beginning with /jw to the application servers. Verify that the load balancer has been installed and configured correctly so that web traffic is directed to the individual application servers.
It is important to ensure that the pre-deployment requirements have been verified. Once verified, the Joget Workflow specific steps are as follows:
Configure the datasource properties files in the shared directory
workflowDriver=com.mysql.jdbc.DriverworkflowUrl=jdbc\:mysql\://host\:port/database_name?characterEncoding\=UTF-8 workflowUser=username profileName= workflowPassword=password
Deploy Joget WAR files to the application servers and configure the startup properties to point to the shared directory.
export JAVA_OPTS="-XX:MaxPermSize=128m -Xmx1024M -Dwflow.home=/shared_directory_path"
Activate license for each server. Each server has a unique system key and requires a separate license activation.
Once the pre-deployment and clustering configuration has been done, the testing is a matter of using a web browser to access the load balancer.
This sample describes an installation using the following products:
|IMPORTANT: Please note that this is not a comprehensive guide and does not cover production-level requirements e.g. user permissions, network and database security, etc. Please ensure that these are covered by your system, network and database administrators.|
Share a file directory to be accessed by the application servers. This directory is used to store configuration files, system generated files, and uploaded files.
In this sample, the shared file directory will be a directory /export/wflow in the file server
sudo exportfs -ra sudo service nfs-kernel-server restart
In the application servers, install the NFS client
echo test123 > /opt/joget/shared/wflow/test.txt
Install MySQL (https://help.ubuntu.com/14.04/serverguide/mysql.html)
mysql -h database_host -u joget -p
Install Apache Tomcat on each of the application servers. In each application server, run the following to extract tomcat into /opt/joget:
Open a web browser and access each server to confirm that http://server:8080/jw
Configure Tomcat for clustering by editing apache-tomcat-8.0.20/conf/server.xml. Add jvmRoute="node01" to the Engine tag and uncomment the Cluster tag.
More information on Tomcat clustering is at http://tomcat.apache.org/tomcat-8.0-doc/cluster-howto.html
In the load balancer server, install Apache HTTP Server
sudo a2ensite jwsite sudo service apache2 reload
Deploy and configure Joget Workflow LEE as described earlier in 2.2 Joget Clustering Configuration