|By Chris Lockhart||
|July 29, 2005 05:15 PM EDT||
Given the broad range of configurations open to an infrastructure planner when dealing with WebSphere software, it’s no wonder there’s often a great deal of confusion when it comes to making a complex product like Portal highly available. Naturally, there’s no “Learn Clustering in 20 Minutes” manual, but there are general steps to follow and some to avoid.
Let’s start with a very basic explanation of the WebSphere cell and how the Portal fits into it. (See Figure 1.)
A basic WebSphere AppServer install is often on a single machine typically referred to as a node. A simple enterprise infrastructure might include several AppServer nodes each doing their own tasks. As the infrastructure evolves and grows more complex, the need arises to simplify operational management of the multiple nodes. The Network Deployment incarnation of the WebSphere Application Server gives you the ability to manage and control multiple Application Servers centrally. The configuration of security parameters, user directories, and JNDI resources is greatly simplified by this centralization of operational management. Instead of deploying code to three different WebSphere machines, I can now deploy once and have the Network Deployment services distribute the code for me. The combination of the Network Deployment Manager and the Application Servers it manages represent the WebSphere Cell.(See Figure 2.)
The process of adding Application Server nodes to the cell is called federation. Its opposite, unfederation, describes removing a node from a Cell and returning it to standalone status.
The Deployment Manager communicates with Cell members via a small JVM called the nodeagent located on each of the managed nodes. The Deployment Manager will keep track of all configuration changes and use the nodeagents on the federated nodes to “synchronize” the configurations so they all represent what’s defined in the master configuration on the Deployment Manager itself.
In many respects Portal is no different than any other web application that would be configured to run in a WebSphere Cell. Just like a regular webapp, I could choose to run Portal on a single node in the Cell or on multiple nodes or even have multiple instances running on a single node. (See Figure 3.)
Unlike a regular Web application, Portal uses several other services that aren’t part of the regular WebSphere Application Server product set. As such, there’s a completely separate installation that must exist on each node that you want to run Portal.
A Network Deployment infrastructure consisting of several WebSphere AppServer nodes gives you tremendous advantages that could (and do) fill entire Red Books. For purposes of the Portal, four are of primary importance:
- Simplification of the operational management
- Central management of the Portal configurations
- Highly available environment
- Session and cache data replicated between all Portal nodes
Which Way To Cluster?
Starting with Portal 5.1, there are two ways to establish a Portals cluster. The first way is to build a WebSphere Cell out of multiple federated nodes and then install Portal on each node in the existing Cell. The second way is to take a set of standalone nodes with Portal already installed on them and federate them into a Cell. Which is the better way? Well, that depends.
Using an existing Cell of AppServers and simply installing Portal into that topology is easiest, but has its drawbacks. When an Application Server node is federated into a Cell, it loses its default configuration and assumes the configuration dictated by the Network Deployment Manager. If the node is unfederated at any time, then the original configuration is loaded from a backup copy and the node reverts to its standalone state. Therefore, if I have a node that’s already been federated and then install an application on it, if that node ever gets unfederated it will revert to its default state and the application I installed on it will go away. You can see the limitation here. I could not unfederate a Portal node and have it still be a Portal node.
Conversely, if I have a standalone node on which I install Portal and then federate it, the Portal is part of the node’s original pre-federated configuration and will always be present on the node, even if it gets unfederated. Unfortunately, doing it this way is more complicated and prone to error and endless frustration. Historically this has been the only way to cluster the Portal and it has led to many late nights and high consulting fees.
A real-world recommendation, one that recognizes impossible deadlines, unrealistic demands, and the constant need to document procedures, would be to go the first route. Build your Cell of federated WebSphere nodes, verify that they function, then add Portal to the mix. It’s less flexible, but I think you’ll find yourself going home at 5pm more often.
Naturally you first have to install WebSphere Application Server. Let’s assume you can get this far and you have two WAS nodes (WAS1 and WAS2) installed and ready to go at version 5.1.x. There are no Web applications installed other than the default ones. You have also installed and configured a Network Deployment Manager (DM1) for version 5.1.x. For argument’s sake, let’s say each component is installed on a separate Windows machine.
In our scenario, WebSphere Global Security isn’t enabled (yet). This makes the federation process easy. On each of the two WAS nodes you would execute the following:
HostName DM1_SOAP_PortBy default, the SOAP port of the Deployment Manager out-of-the-box is 8879.
Once executed, you’ll see the console output describing the federation process. When it’s complete on both nodes, you’ll have a Cell. See? Easy. Now let’s put Portal into the mix.
Installing the Portal
Our plan is to install Portal first on WAS1, do some basic configuration, then install what’s called a “secondary” Portal on WAS2. Prior to installing Portal anywhere, however, we must ensure that the WAS1 and WAS2 nodes have any and all patches/efixes required by the Portal release that we’re installing. In our example, we’re going to install Portal 5.1.
At this point you go ahead and install Portal on WAS1. This is a Custom Install. You’ll be choosing the Application Server that’s already installed on this node and federated into the Cell. The installer will recognize that this is a federated node and prompt you to designate whether this is a primary or secondary node. Since this is the first install, you must select primary node. The installer will interface with the Deployment Manager controlling this node and install the appropriate files.
- Execute the installer on WAS1
- Agree to the terms. Click Next. (See Figure 4.)
- Select Custom. Click Next. (See Figure 5.)
- Select the instance that you want to use from the list. If the installation program doesn’t detect an instance of WebSphere Application Server but you know that it’s on the machine, you can enter the directory path to the WebSphere Application Server. Click Next. (See Figure 6.)
- Select Primary, and click Next. (See Figure 7.)
- Specify the directory where you want to install the WebSphere Portal. Click Next. (See Figure 8.)
- Verify the components to be installed and click Next.
- When the installation is finished, the installation program displays a confirmation panel listing the components that have been installed.
- Click Finish.
|Shanthi 01/31/06 07:03:33 AM EST|
This was a great article .. helped me understand clustering better. I was looking for a way to add a node into a pre-configured cluster and this article pointed me in the right direction. I am going to use this as reference for my production deploy.
|WebSphere News Desk 07/29/05 04:39:57 PM EDT|
Your Guide to Portal Clustering in WebSphere Portal Server 5.1. Some things in WebSphere PortalServer work well and are well documented. Other things are well documented and work well in theory. Still other things have okay documentation and will work well when all of the WebSphere stars are aligned. Depending on your implementation, Portal Clustering can fit into all three categories.
The Internet of Things (IoT) promises to simplify and streamline our lives by automating routine tasks that distract us from our goals. This promise is based on the ubiquitous deployment of smart, connected devices that link everything from industrial control systems to automobiles to refrigerators. Unfortunately, comparatively few of the devices currently deployed have been developed with an eye toward security, and as the DDoS attacks of late October 2016 have demonstrated, this oversight can ...
Dec. 3, 2016 02:45 PM EST Reads: 612
Extracting business value from Internet of Things (IoT) data doesn’t happen overnight. There are several requirements that must be satisfied, including IoT device enablement, data analysis, real-time detection of complex events and automated orchestration of actions. Unfortunately, too many companies fall short in achieving their business goals by implementing incomplete solutions or not focusing on tangible use cases. In his general session at @ThingsExpo, Dave McCarthy, Director of Products...
Dec. 3, 2016 02:45 PM EST Reads: 452
Machine Learning helps make complex systems more efficient. By applying advanced Machine Learning techniques such as Cognitive Fingerprinting, wind project operators can utilize these tools to learn from collected data, detect regular patterns, and optimize their own operations. In his session at 18th Cloud Expo, Stuart Gillen, Director of Business Development at SparkCognition, discussed how research has demonstrated the value of Machine Learning in delivering next generation analytics to impr...
Dec. 3, 2016 02:15 PM EST Reads: 6,943
More and more brands have jumped on the IoT bandwagon. We have an excess of wearables – activity trackers, smartwatches, smart glasses and sneakers, and more that track seemingly endless datapoints. However, most consumers have no idea what “IoT” means. Creating more wearables that track data shouldn't be the aim of brands; delivering meaningful, tangible relevance to their users should be. We're in a period in which the IoT pendulum is still swinging. Initially, it swung toward "smart for smar...
Dec. 3, 2016 02:00 PM EST Reads: 438
20th Cloud Expo, taking place June 6-8, 2017, at the Javits Center in New York City, NY, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy.
Dec. 3, 2016 01:30 PM EST Reads: 2,115
Businesses and business units of all sizes can benefit from cloud computing, but many don't want the cost, performance and security concerns of public cloud nor the complexity of building their own private clouds. Today, some cloud vendors are using artificial intelligence (AI) to simplify cloud deployment and management. In his session at 20th Cloud Expo, Ajay Gulati, Co-founder and CEO of ZeroStack, will discuss how AI can simplify cloud operations. He will cover the following topics: why clou...
Dec. 3, 2016 01:15 PM EST Reads: 581
"ReadyTalk is an audio and web video conferencing provider. We've really come to embrace WebRTC as the platform for our future of technology," explained Dan Cunningham, CTO of ReadyTalk, in this SYS-CON.tv interview at WebRTC Summit at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
Dec. 3, 2016 01:00 PM EST Reads: 284
Internet of @ThingsExpo, taking place June 6-8, 2017 at the Javits Center in New York City, New York, is co-located with the 20th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. @ThingsExpo New York Call for Papers is now open.
Dec. 3, 2016 01:00 PM EST Reads: 1,853
Successful digital transformation requires new organizational competencies and capabilities. Research tells us that the biggest impediment to successful transformation is human; consequently, the biggest enabler is a properly skilled and empowered workforce. In the digital age, new individual and collective competencies are required. In his session at 19th Cloud Expo, Bob Newhouse, CEO and founder of Agilitiv, drew together recent research and lessons learned from emerging and established compa...
Dec. 3, 2016 12:45 PM EST Reads: 727
Data is the fuel that drives the machine learning algorithmic engines and ultimately provides the business value. In his session at Cloud Expo, Ed Featherston, a director and senior enterprise architect at Collaborative Consulting, discussed the key considerations around quality, volume, timeliness, and pedigree that must be dealt with in order to properly fuel that engine.
Dec. 3, 2016 12:45 PM EST Reads: 1,942
Everyone knows that truly innovative companies learn as they go along, pushing boundaries in response to market changes and demands. What's more of a mystery is how to balance innovation on a fresh platform built from scratch with the legacy tech stack, product suite and customers that continue to serve as the business' foundation. In his General Session at 19th Cloud Expo, Michael Chambliss, Head of Engineering at ReadyTalk, discussed why and how ReadyTalk diverted from healthy revenue and mor...
Dec. 3, 2016 12:15 PM EST Reads: 1,493
We are always online. We access our data, our finances, work, and various services on the Internet. But we live in a congested world of information in which the roads were built two decades ago. The quest for better, faster Internet routing has been around for a decade, but nobody solved this problem. We’ve seen band-aid approaches like CDNs that attack a niche's slice of static content part of the Internet, but that’s it. It does not address the dynamic services-based Internet of today. It does...
Dec. 3, 2016 11:30 AM EST Reads: 829
The 20th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held June 6-8, 2017, at the Javits Center in New York City, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Containers, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit your speaking proposal ...
Dec. 3, 2016 11:30 AM EST Reads: 2,068
You have great SaaS business app ideas. You want to turn your idea quickly into a functional and engaging proof of concept. You need to be able to modify it to meet customers' needs, and you need to deliver a complete and secure SaaS application. How could you achieve all the above and yet avoid unforeseen IT requirements that add unnecessary cost and complexity? You also want your app to be responsive in any device at any time. In his session at 19th Cloud Expo, Mark Allen, General Manager of...
Dec. 3, 2016 11:15 AM EST Reads: 1,628
Bert Loomis was a visionary. This general session will highlight how Bert Loomis and people like him inspire us to build great things with small inventions. In their general session at 19th Cloud Expo, Harold Hannon, Architect at IBM Bluemix, and Michael O'Neill, Strategic Business Development at Nvidia, discussed the accelerating pace of AI development and how IBM Cloud and NVIDIA are partnering to bring AI capabilities to "every day," on-demand. They also reviewed two "free infrastructure" pr...
Dec. 3, 2016 10:45 AM EST Reads: 791
Major trends and emerging technologies – from virtual reality and IoT, to Big Data and algorithms – are helping organizations innovate in the digital era. However, to create real business value, IT must think beyond the ‘what’ of digital transformation to the ‘how’ to harness emerging trends, innovation and disruption. Architecture is the key that underpins and ties all these efforts together. In the digital age, it’s important to invest in architecture, extend the enterprise footprint to the cl...
Dec. 3, 2016 10:45 AM EST Reads: 2,139
Connected devices and the industrial internet are growing exponentially every year with Cisco expecting 50 billion devices to be in operation by 2020. In this period of growth, location-based insights are becoming invaluable to many businesses as they adopt new connected technologies. Knowing when and where these devices connect from is critical for a number of scenarios in supply chain management, disaster management, emergency response, M2M, location marketing and more. In his session at @Th...
Dec. 3, 2016 09:30 AM EST Reads: 3,929
"Dice has been around for the last 20 years. We have been helping tech professionals find new jobs and career opportunities," explained Manish Dixit, VP of Product and Engineering at Dice, in this SYS-CON.tv interview at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
Dec. 3, 2016 09:30 AM EST Reads: 832
What happens when the different parts of a vehicle become smarter than the vehicle itself? As we move toward the era of smart everything, hundreds of entities in a vehicle that communicate with each other, the vehicle and external systems create a need for identity orchestration so that all entities work as a conglomerate. Much like an orchestra without a conductor, without the ability to secure, control, and connect the link between a vehicle’s head unit, devices, and systems and to manage the ...
Dec. 3, 2016 09:00 AM EST Reads: 454
"We're a cybersecurity firm that specializes in engineering security solutions both at the software and hardware level. Security cannot be an after-the-fact afterthought, which is what it's become," stated Richard Blech, Chief Executive Officer at Secure Channels, in this SYS-CON.tv interview at @ThingsExpo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
Dec. 3, 2016 08:30 AM EST Reads: 501