Joget Workflow v6 Beta 3 Released

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Introduction

Overview

This document is intended to describe the steps required to deploy Joget Workflow Large Enterprise Edition (LEE) in a clustered environment for scalability and redundancy.

Requirements

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:

  • Load Balancers
  • Application Servers
  • Shared File Directory
  • Shared Database

Architecture

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:

Deployment and Configuration Guide

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.


Pre-Deployment Requirements

Before the clustering installation can be done, the following prerequisites are needed:

Shared file directory

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.

Shared database

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.

Application servers

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

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

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.

 

Joget Workflow Clustering Configuration

It is important to ensure that the pre-deployment requirements have been verified. Once verified, the Joget Workflow specific steps are as follows:

Datasource Configuration

Configure the datasource properties files in the shared directory

  1. Copy the files app_datasource.properties and app_datasource-default.properties from the wflow directory of a standard Joget installation into the shared file directory.
  2. Edit app_datasource-default.properties and set the database connection settings for the shared database, e.g. for MySQL, change the bold values below:

Application Deployment and Configuration

Deploy Joget WAR files to the application servers and configure the startup properties to point to the shared directory.

  1. Deploy the WAR files jw.war and jwdesigner.war from the LEE bundle to each of the application servers e.g. for Apache Tomcat, copy the files into the tomcat webapps directory
  2. Add a Java -wflow.home=shared_directory_path option in the application server startup e.g. for Apache Tomcat, modify the JAVA_OPTS line

License Activation

Activate license for each server. Each server has a unique system key and requires a separate license activation.

  1. For each of the application servers, use the browser to directly access the Joget web console bypassing the load balancer e.g. {+}http://server1:8080/jw/web/console/home+
  2. Request for license and activate it using the link in the web console footer.

Post-Deployment Testing

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.

 

Sample Installation and Configuration

 

This sample describes an installation using the following products:

Joget Workflow

Joget Workflow v5 LEE

Load Balancer

Apache HTTP Web Server 2.4 with mod_proxy and mod_balancer (proxy and load balancing modules) running on Ubuntu 14.04

Application Servers

Apache Tomcat 8.0 running on Ubuntu 14.04

Shared File Directory

NFS on Ubuntu 14.04

Shared Database

MySQL 5.5 on Ubuntu 14.04

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.

Create a Shared File Directory

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

In the file server, install the NFS server

Create shared directory and set permission

Configure NFS to export the shared directory, edit /etc/exports to export the directory to the local 192.168.1.0 subnetwork with your favourite editor

The /etc/exports should contain the following:

Export the shares and restart NFS service

 

Mount the Shared Directory in the Application Servers

In the application servers, install the NFS client

Create new directory /opt/joget/shared/wflow to mount the shared directory and set the directory permissions

Mount the shared directory.

Test read-write permissions to confirm that the directory sharing works.

Create a Shared Database

Install MySQL (https://help.ubuntu.com/14.04/serverguide/mysql.html)

Create a database called jwedb accessible to the application servers.

Run the following MySQL commands to create a blank database

Populate the newly created database with the Joget database schema

Configure database permissions

Run the following MySQL commands to grant permissions to user joget and password joget

Configure MySQL to listen to database connections from remote hosts. Edit the my.cnf file with your favourite editor

Comment away the bind-address directive by adding a # in front of the line

Restart MySQL

In the application server, test a remote connection to the database server database_host



Deploy Application Servers

Install Apache Tomcat on each of the application servers. In each application server, run the following to extract tomcat into /opt/joget:

Start each application server

Open a web browser and access each server to confirm that http://server:8080/jw

 

 

Configure Application Server Session Replication

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.

Configure local domain IP. Verify that the local server name resolves to the IP and not 127.0.1.1. Assuming the server name is server1 and the IP is 192.168.1.10, edit /etc/hosts and set:

Verify multicast is enabled between the application servers by running ifconfig and look for MULTICAST. Try http://blogs.agilefaqs.com/2009/11/08/enabling-multicast-on-your-macos-unix/ if there are issues.

Restart the Tomcat servers.

Verify session replication working between the application servers. The catalina.out log file in apache-tomcat-8.0.20/logs should show something similar to:

More information on Tomcat clustering is at http://tomcat.apache.org/tomcat-8.0-doc/cluster-howto.html

 

Configure Load Balancer

In the load balancer server, install Apache HTTP Server 

Install proxy and balancer modules

Configure a new site with the proxy and balancer modules. Create a new file in /etc/apache2/sites-available, named jwsite

Add the contents

Enable the new site and restart Apache



Deploy and Configure Joget Workflow LEE

Deploy and configure Joget Workflow LEE as described earlier in 2.2 Joget Clustering Configuration


 

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