Web Application Clustering- Networking Made Easy
Clustering of web application is necessary when continuously available, high-performance and secure web application is the main concern of a business. When several parallel servers are required, clustering is done to run an application. This is technically called cluster nodes. The vital advantage of clustering web applications is that when the load is distributed among different servers, then even if there is a server failure, the application would be still available via other nodes of the cluster. This clustering process finds its maximum application in scalable enterprises, where the performance can be further improved by adding more nodes to the cluster. Several servers provide this clustering process. One of the most famous is the JBoss Application Server (AS) and Sun Secure Application Switch, which supports clustering out of the box.
For simple clustering, encryption and failover, web servers include Software load-balancing and Encryption plug-in, to place it on a web proxy server. In large-scale deployments, load-balancers and hardware accelerators are necessary for firewalls and encryption. But complexity arises because the hardware used is from different vendors. Also reliability, correctness and interoperability may endure huge costs and waste time. This gives way to alternative method of web clustering, which combines failover, load-balancing, encryption services, into one single device.
The above fig shows the clusters and server nodes.
The 2 vital benefits of clustering of web applications are
Virtualization of Switch
In this application, a multiple and virtualized load-balancer and security domains are created in a single switch. Device resources may be partitioned into multiple virtual switches, each with application of switching, Secure Socket Layer (SSL) acceleration, load-balancing and management policies and quotas. The main advantage of creating virtual switch is to obtain healthy isolation of traffic in networking which otherwise requires firewalls and complex access-control rules.
VLANs and L4 and L7 load-balancing
This runs parallel with virtual switching. The strong virtualization consolidates multiple web infrastructure networks into a single device.
A Sample Application and Its Deployment Architecture
The above figure shows Deploying a Single Application-Server Cluster where the configuration of content delivery portals or large intranets. The sample application like ‘clusterjsp’ shows the process of load-balancing and failover function.
Creating Server Cluster Application
Simply a cluster can be created with 2 server instances running on 2 distinct hosts (machines) or one can complete the process by running the 2 instances on the same host on different ports.
The cluster can be simulated in two ways
By using Project Glassfish, application-server of Java platform, Enterprise Edition 5 and Sun Java System Application Server Enterprise Edition 9 can be implemented. This whole process will take only 30 minutes.
Another way is to adopt this option using administrator privileges on the test systems and evaluate the advanced management, high availability and monitoring capabilities.
Configuration of Application Switch
3 ways to configure Application Switch is possible-
HTTPs Web Interface.
Secure Shell (SSH).
Telnet-accessible command-line interface (CLI).
Connection To Application Switch
One can connect to the Application Switch from the Administrator Console.
After this final testing of the sample is done for allowing it to be used as a cluster network of Web Applications.
Bounceweb hosting enables you to cluster your web applications for the best effect.
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