|Exam Name||:||WebSphere Message Broker V6.0, System Admin|
|Questions and Answers||:||102 Q & A|
|Updated On||:||April 23, 2019|
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FRAMINGHAM, MA--(Marketwired - Jun eleven, 2013) - Correlsense, a number one IT monitoring software business, nowadays added SharePath for IBM® WebSphere Message broker (WMB). This latest enhancement to SharePath three.0, the company's business-type APM answer for managing complicated interconnected purposes, is choicest for any firm relying on IBM middleware for its transactional backbone.
As functions turn into increasingly connected, businesses are employing business service Buses (ESBs) to tackle the communications between disparate purposes and features. the use of an ESB, besides the fact that children, introduces new administration challenges. They are often decoupled from the core utility and execute company logic and code which provides complexity whereas increasing the time to discover and isolate performance considerations. unlike different middleware management solutions that focus on infrastructure monitoring, SharePath for IBM WebSphere Message broking service presents greater granular visibility into the finished stream of individual message flows into, inside and out of the ESB. This offers indisputable proof about the place efficiency complications and errors turn up, whether within message broker, through which node, or in the backend capabilities or applications.
SharePath follows each message circulate via its nodes and external features, and logs all this specified suggestions in a scalable huge statistics repository, including parameters, values and exception mistakes of each and every execution. moreover wide developed-in logging, auditing, and monitoring of all messages, SharePath provides trending and alter evaluation to track performance over time.
SharePath for WebSphere Message broking service gives middleware owners, IT operations and creation assist groups the ability to right now be aware dependencies and establish middleware bottlenecks. Most especially, SharePath for IBM WebSphere Message broking service:
"SharePath for IBM WebSphere Message broking service empowers corporations to profit control over a crucial enterprise part," mentioned Nir Livni, VP of products. "businesses the usage of SharePath not should build extensive, expensive and blunder-prone logging and tracking mechanisms to take note what happened to a selected message and whether it succeeded or failed."
SharePath for IBM WebSphere Message broking service is attainable immediately as a standalone offering or as part of a complete conclusion-to-end APM solution in accordance with SharePath three.0. more information can also be discovered at http://www.correlsense.com/solutions/business-need/sharepath-for-ibm-websphere-message-broking service/
About Correlsense Correlsense develops software performance administration and IT monitoring utility. it's the APM manufactured from alternative for enterprise and IT operations managers that rely on advanced and critical commercial enterprise applications. Correlsense paints a complete and dynamic photo of IT carrier stages and efficiency for functions that span cellular, SaaS, cloud, facts center and legacy mainframes. Correlsense became established in 2005, is privately held and SharePath purchasers consist of one of the world's greatest economic, telecom and retail establishments. For more assistance, discuss with www.correlsense.com.
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System Administrators (SAs) are a lazy lot. Now, that might seem an unusual way to begin an article about automation, but if SAs weren’t lazy, automation software might have never found a home. It isn’t a bad thing for SAs to be lazy. In fact, it’s a very good thing that they are, otherwise everything would require manual intervention and perhaps two to three times the number of SAs to perform the work that one can comfortably do.
Automation goes far beyond CRON; it encompasses user account maintenance, self-healing scripts, logwatchers, network service setup, file copying, filesystem housekeeping, application configuration, and system monitoring for example. Some administrator use automated scripts to deploy physical and virtual machines. Although CRON, Task Scheduler, and other process scheduling applications are certainly useful and ubiquitous, they aren’t the only automation tools in the System Administrator’s arsenal nor should they be.
The following is an introduction to 5 applications and suites that SAs use to automate daily tasks, to keep a watchful eye on systems and processes, and software that, in general, mimics traditional human eyes on glass and fingers on keyboards. The companies and software featured in this article represent a wide range of possibilities for automating your enterprise. The list is in alphabetical order by company name.
Infrared360 - Avada Softwarehttps://o1.qnsr.com/log/p.gif?;n=203;c=204660774;s=9478;x=7936;f=201812281339040;u=j;z=TIMESTAMP;a=20403972;e=i
Avada Software is a small company with a big product known as Infrared360 (IR360), which is an enterprise middleware monitoring, testing, auditing, and statistical reporting tool. IR360 is a J2EE-compliant enterprise messaging management portal that enables secure, delegated access and permissions to WebSphere MQ, WebSphere Message Broker, WebSphere Application Server/JBOSS/Tomcat, Weblogic, TIBCO/EMS, Red Hat A-MQ, any web service, and any URL.
One of the most compelling features of IR360 is its capability to perform what system administrators call “self-healing” or what Avada Software calls automated corrective actions. If a monitored service fails, an MQ channel for example, IR360 will attempt to restart the failed service before it sends an automated alert. Administrators also receive notification that IR360 restarted the channel. And IR360 responds to error conditions via any service, such as MQSC, java, SOAP, SQL, .bat/.cmd files, shell scripts, and other scripting languages.
Automated services that IR360 performs:
· Qmgr definition backup
· Cloning of middleware objects
· Start processes in response to alert conditions
· Initiate services in response to alert conditions
· Cleanup messages and queues
· Scheduling and running of test cases
IR360 also features automated, rule-based analysis for problem conditions and automated cleanup of messages and queues. You can schedule services to perform channel and queue administration for your messaging environments. IR360 runs on standard hardware and can be installed and run as a virtual machine. It requires a transaction-safe relational database system such as MySQL, DB2, Oracle, and SQL Server for operation.
Hewlett-Packard Server Automation – Hewlett-Packard
In 2007, HP purchased Opsware, Inc. (formerly LoudCloud), which was one of the first companies to market SaaS and cloud computing. Now known as HP Server Automation (HPSA), it is a full automation suite for provisioning operating systems onto bare metal, for software installation, for patch management, for auditing, and for security management. HPSA has both a web interface and a java application for management.
HPSA uses a local agent to report back to a central “core” system. This agent also responds to requests, delivers software, runs scripts, and edits system files managed by a core or multiple cores. Administrators using HPSA can manage the entire life cycle of systems from deployment to decommissioning.
Administrators can manage both virtual machines and physical machines with HPSA, plus manage multiple operating systems all within the same interface. Jobs (scripts, packages, patches, files) can be delivered immediately or based on a schedule. Additionally, administrators may either choose to allow a system to reboot after patching or to deny a reboot. Denying a reboot allows administrators to deliver patches and software to numerous servers at once without disruption of production activities.
HPSA delivers the following automated services:
· Shell scripts
· Software packages
· Security updates
· Operating systems to bare metal
· System reboots or no reboots after patching
· Job status email
· Scheduled or ad hoc jobs to individual or multiple systems
If you need to edit the /etc/hosts file, or the C:\WINDOWS\System32\Drivers\etc\hosts file, for a group of servers, you can select a subset of servers based upon a search or you can select a private group of servers that only you have access to and then deliver your modified hosts file to all selected servers in a single job.
HPSA is an automation suite capable of handling any size environment and many different operating systems (Windows, Linux, UNIX).
Pulseway offers a SaaS-based monitoring and management server subscription into which all of your Windows, Mac, and Linux systems will automatically report via an installed agent. It also supplies apps for your mobile phones, tablet computers, and web browsers from which you can receive alert notifications when things go wrong, respond, and troubleshoot from anywhere and using any device.
For automated monitoring, Pulseway provides real-time monitoring and alerting for applications, services, filesystems, CPU, memory, and system status. You can also customize alerts for your own applications and services. Using the SaaS-based enterprise server, you can create stratified user accounts and grant permissions based on job roles. For example, you can create a user that can perform process restarts, but can’t reboot or shutdown a system.
Pulseway’s self-healing capability is an extensive of its monitoring feature. You can specify alert conditions that, when met, will trigger a task such as restarting a process, running a script, or some other specified behavior.
You can also monitor and manage native and third party applications and services with Pulseway, such as:
· Active Directory
· Exchange Server
· SQL Server
· VMware hosts and VMs
· XenServer hosts
· Amazon services
· Azure services
· ESET Remote Administrator
· StorageCraft ShadowProtect
Pulseway’s automated monitoring enables system administrators to “watch” systems, services, and storage 24x7x365 in real time. It also allows administrators to respond quickly to alert notifications and keep business critical services up and running from any location and on any device.
SimpleWAN’s simplicity comes about because the firewall device comes preconfigured and self-provisions on your network. Its simplicity also originates from its automated two-way network traffic monitoring, alerting, and updating. SimpleWAN’s automation also covers automated configuration backup and automated maintenance that includes firmware updates and upgrades.
The complete list of automated SimpleWAN services:
· Random port-hopping security
· Dynamic WAN routing
· Remote and local logging
· Random remote client termination
· Real time monitoring
· Real time alert notifications
· Configuration backup
· Firmware updates and upgrades
SimpleWAN’s automated updates aren’t limited to firmware and maintenance releases. Your device receives rules and security updates resulting from known attacks and threats occurring in other customer environments. SimpleWAN makes its devices and services available through value added resellers (VARs) and managed services providers (MSPs).
Network Configuration Manager - SolarWinds
SolarWinds builds and supports dozens of enterprise tools, but the focus of this post is its Network Configuration Manager (NCM). NCM includes an array of automated and automatic features including automated network discovery that scans your entire network and imports discovered devices into its database. Its automated device association features automatically maps routers, firewalls, switches, and load balancers regardless of vendor and then matches the device with an NCM device template for automatic configuration backups.
The Network Configuration Manager’s automation features:
· Automated network discovery
· Automated device association
· Real time change detection
· Instant notification of configuration changes
· Automatic logging of all changes
· Automatically generated device inventory
· Automatic configuration backup
· Vendor-neutral configuration change automation
NCM’s built-in Syslog and trap server provides instant notification of any changes to a configuration. This feature provides information that’s valuable during troubleshooting because you’ll have a list of all changes for a specific device available to you. SolarWinds tools are quick to setup and easy to use. For example, you can install NCM, discover your network devices, and start backing up network configurations in under an hour.
Spiceworks is a free, automated inventory tool for your systems and their software. It scans all network-connected devices, without using agents, and reports that information back to a central repository. Spiceworks is a non-agent discovery tool that uses standard network protocols to discover and report on all your devices. The one limitation that it has is that it requires Windows XP Pro SP2 and newer or Windows 2003 Server SP1 and newer. You can run Spiceworks on a virtual machine (VM), but it requires at least 4GB RAM and should be dedicated to running this single service. On a physical system, you can run a limited number of other services with only 4GB RAM. For more than 50 discovered devices, you should increase your RAM to at least 8GB for either a physical or for a virtual machine.
Spiceworks can scan multiple networks as long as the Spiceworks server has network access to those systems, otherwise you’ll have to install the application on a server or VM in each network.
Spiceworks doesn’t use agents to monitor your systems, but you must setup your network devices to allow SNMP connectivity, provide Administrator-level access for Windows systems, and root-level access for Linux systems. Providing this information doesn’t compromise security, but it allows Spiceworks to collect valuable information on software, filesystems, services, and applications running on your systems.
Spiceworks is community-driven software, which means that free support is available through the user community that boasts membership in the millions. Alternatively, for enterprise installations, you can purchase subscription support. The Spiceworks community also provides many modules for the product that extend its capabilities beyond its original inventory-oriented scope.
Automation tools are indispensable elements in every system administrator’s arsenal to which they refer on a regular basis. The lazy system administrator knows that automation is the key to a more productive infrastructure and a more productive system administrator. Management also knows the value of automation. It lowers costs, increases revenue, and maintains a smoother operating environment that requires fewer human hands. Automation isn’t just a good thing; it’s an essential thing.
Photo courtesy of Shutterstock.
NewsSOA for Your Home
He described an architectural project concerning his own home that has taken him three years to build -- in between traveling and working for IBM. The home is not quite "live" yet -- that launch is scheduled for Oct. 15. However, he provided a sneak preview of what's to come with his presentation, "SOA in the Home -- With MQ, Message Broker and RFID Integration."
Rhys Jenkins can control much of the functions of his 12,000-square-foot home (a renovated farmhouse) using an Apple iPhone, which is his current preferred interface device. He's also been experimenting with voice recognition technology and a talking interface, which seemed a little spotty -- at least when he tried to get his Apple laptop to tell him a joke during the presentation.
The house's internal services include camera motion detection, a front door area that scans RFID tags implanted in the shoes of family members, house lighting control, door locking and many other such functions. If someone comes to the front door and an RFID link is not read, then the service will turn on a camera and transmit the image of the visitor to the Rhys Jenkins' TV set, using Channel 88.
External services include weather reports retrieved from the National Oceanic and Atmospheric Administration's (NOAA's) National Weather Service and maps via Google GMaps. There's also a rodent detection system for the barn. Vermin stand little chance against Rhys Jenkins' service that records a "mouse down event." Traps triggered in the barn also transmit an image of the kill event, so there's no need to keep checking the set traps. The system has snagged five mice so far.
Rhys Jenkins is using a Windows-based IBM WebSphere MQ-Message Broker as a representative state transfer (REST) interface between his Macs and PCs using PHP AJAX. It allows him to call the NOAA weather service and parse the response. MQ-Broker will also enable him to do a Web service call Charter.net to see what's on TV.
He's also using an 802.11n Wi-Fi network for the home, consisting of two Apple AirPort radios. The wireless network also includes an AirPort Express radio, two Linksys 802.11b radios and one Cantenna antenna. He described the 802.11n devices, which use the specification that enables greater multimedia throughput, as "infinitely better" than previous 802.11 iterations.
The network is designed to withstand failures, so in addition to wireless connectivity, Rhys Jenkins used Cat6 wiring in some cases to enable 10 Gbps Ethernet connectivity.
The RFID equipment, most of which is made by Texas Instruments, Rhys Jenkins said, can see and program a tag that is not battery assisted. However, the read distance is short, at about nine to 12 inches. He performs RFID interface coding using Applescript but rejected using Texas Instruments' sample code, which he called "utterly useless."
He didn't have much praise for RFID technology, saying that the only thing that RFID tags are good for is adding them to shipping containers for tracking purposes.Currently, there are three main standards for radios used with RFID chips, along with 80 variants, which is why things don't work well, he said.
Rhys Jenkins uses Chicken of the VNC (virtual network computing) for his client, allowing him to drive all of his computers from a single interface. Likewise, VMware Fusion for the Mac helps him to run his IBM Broker and Macs all on the same machine. He uses WAMP (Windows, Apache, MySQL, PHP) to drive his Web site, noting that "PHP is a thousand times easier to code than Java."
In general, Rhys Jenkins said he talks about his house because he thinks it's a cool example of SOA, and to detail the things that go wrong. It's just a normal software engineering project.
"All of this SOA stuff is normal systems integration," he said. The special part is the fact that you can use things like SOAP and WSDL [Web Services Description Language] to talk to services. For example, my talking interface can be talked to through SOAP interfaces. But there is nothing special about SOA and ESBs [enterprise service buses] -- I've been doing it for years -- [although] some of the technology now is getting to the point where it makes things useful."
Kurt Mackie is senior news producer for the 1105 Enterprise Computing Group.
While the appliances are quite versatile and can thus be used to solve many different types of problems (and implementers have been quite creative in this regard), we find there are a few common use cases that are typical. These generally focus around security, performance, cost savings, and integration. In the following sections, we discuss each of these in more detail.Solving Security Problems
Let’s think about what it would take to deploy a software-based proxy product in the DMZ. Each of the layers of the ‘typical server’ shown in Figure 1-2 requires specialized skills to install and maintain. Particularly for DMZ deployments, the server hardware itself must be hardened. In highly secure environments, this can involve removing any components that might allow information to be taken from the server, such as USB ports and writeable CD/DVD drives. The operating system must also be hardened, removing components such as telnet and sendmail.3 Often, this results in other layers of the software stack not installing or operating properly! If you are successful in installing the application software stack, it must be hardened as well. These are common requirements for high security environments such as financial companies, intelligence services, and military applications.
Although software-based DMZ components can be hardened successfully, it is a lot of work. Compare this with the simplicity of installing a dedicated, highly secure hardware appliance, purpose built to do a few things well with fairly simple administrative interfaces, as shown in Figure 1-3.
The appliances are hardened out of the box. For example:
The age-old rule for the DMZ is to terminate client connections there and then proxy connections to the backend from the trusted DMZ servers. However, in the field we find even more stringent security policies that do not warrant any traffic (even proxied through these secure intermediaries) to the backend until the client is authenticated and authorized. This is referred to as perimeter security and is an increasingly common requirement, driving sales of DMZ security products such as TAM. Later, we show how DataPower appliances can also solve this problem.
Another requirement for DMZ components is to virtualize or hide the implementation details of backend servers and applications. Typical DMZ products interact only with the protocol layer of the network stack, so they can hide things like hostname/IP, ports, and URIs, whereas XML-centric application proxies such as DataPower appliances can virtualize on a much more intelligent basis and can analyze the entire message stream.
A strong reason for using these types of appliances is the burgeoning risk of systems becoming compromised by XML-based threats. Just as once upon a time we felt HTTP to be innocuous, today we are susceptible to underestimating what can be done by virtue of XML. In Chapter 20 “XML Threats,” we show how entire infrastructures can be brought down using small, simple, well-formed XML files. Only hardware appliances have the processing power to check for the many variations of XML threats.
Another common security problem is a mismatch in the specification levels or credential formats of various technologies across large corporate IT infrastructures. For example, consider a marketing IT silo running on Microsoft®.NET using WS-Security 1.0 and SPNEGO credentials for identity and a manufacturing silo using IBM WebSphere Application Server (WAS), WS-Security 1.1, and LTPA credentials for identity. In today’s ESB-driven SOA architectures, a single transaction may have to pass through both environments, so this presents challenges. Because DataPower appliances incorporate a wide range of the latest specification implementations and credential formats, they can be used to transform messages and credentials to fit the target each step of the way. Notice that this can be used to achieve cross-platform single-signon (SSO), although that also depends on other factors such as having a common registry.To Lower Total Cost of Ownership (TCO)
Refer back to the scenario in Figure 1-2, where there are numerous skills required to install and maintain a typical server and software stack. Now think of this in terms of the staff required and cost to the organization. With self-contained appliances where the operating system and file system characteristics are irrelevant from an administrative perspective, this becomes much less work. The function of the appliances is dedicated and streamlined, hence the administrative tasks and interfaces tend to be as well. For example, in the scenario in Figure 1-2, you have to continually install fixes and updates at every layer of the stack. However, for appliances, you typically do this by uploading a small firmware update and rebooting, which takes only minutes. In the server scenario, you have multiple different administrative consoles to manage the layers of the stack; with the appliances, you have only one console.
The TCO return does not solely manifest itself in the setup and administration of the platform. Consider the silo example in the prior section—where various areas of a corporate IT infrastructure are running Web services across different platforms, such as those from IBM, Microsoft, and BEA. If the corporation has one set of policies for security and SLM that need to be implemented across all these platforms, then it must be done multiple times, by multiple people, with skills on each platform. Not only is the configuration redundant and therefore expensive, but this problem is repeated each time it needs to change, and there is always the risk that the policy will not be implemented exactly the same on each platform, which can lead to security holes or application failures. This is depicted in Figure 1-4.
Figure 1-4 Redundant administration versus simplified appliance model.
A more concrete example can be implemented by creating a single service that acts as a Web service proxy on the DataPower appliance, importing the WSDL files for the Web services providers on each of those backend platforms, and then applying the security and SLM policies on the proxy, thereby gaining policy definition and enforcement one time for all platforms. All this is based on standards that we discuss later, not only Web services itself, but also the accompanying standards such as WS-Security for security, WS-Policy for policy definition, WS-Addressing for endpoint resolution, and WS-Management and WSDM4 for management.Enhancing Performance
XML is the foundation on which many modern architectures are built—it has evolved into SOAP for Web services and is found across the breadth and depth of the SOA stack and related specifications. Over time, it has evolved from a simple markup language to something quite complex and sophisticated. Of course, the problem as far as performance is concerned is that XML is fairly easy for humans to read, but not for computers. It is a verbose representation of data and typically requires significant resources in terms of CPU power and memory to process. This overhead is typically found in parsing the XML document into an in-memory representation and in validating the XML against its schema file.5
Consider the impact of parsing and validating the storm of XML/SOAP documents that hit your systems during peak production levels. Now consider the overhead of security that may be embedded in those messages—validating client identities against LDAP servers, verifying digital signatures, and decrypting encrypted data. This requires a tremendous amount of processing power and time and robs precious cycles away from what your backend systems should really be doing—focusing on transactional business logic! Also consider the absolute waste of expending these cycles for messages that come in badly formed, with schema violations or illegitimate security issues. The cycles expended on processing them and handling the errors are wasted. Figure 1-5 shows a graph demonstrating the CPU overhead of various common tasks. (Notice the parsing level is low here—the main hit when parsing is memory utilization.) Notice the impact of security operations. This can be helped somewhat with hardware-assisted acceleration, but the cost-benefit of hardware acceleration boards is often debated. Also note that abusing these security features to consume CPU resources is one way of mounting attacks.
A grand solution for this, of course, is to use appliances to do all that heavy lifting at near wire speed. As you will see when we discuss the appliance characteristics, they are amazingly fast and can handle these tasks at orders of magnitude faster than software-based solutions running on standard servers. Now focus on another scenario—one where the appliance makes sure that only clean traffic gets to the backend systems. Imagine the huge differential in available processing power on the backend if the validation and security tasks are done by the time the traffic gets there. The appliances can validate schemas, verify signatures, decrypt the data, and more. This can often result in huge performance returns, depending on considerations such as message sizes, cipher strengths, network latency, and so forth.
Speaking of message sizes, this is often another major stumbling block for Java-based software systems processing XML. In modern day real-world systems, we are now seeing huge SOAP messages on the order of hundreds of megabytes or even gigabytes in size. The conundrum is how to process these, given constraints on maximum JVM heap sizes in many platforms. Due to aggressive built-in streaming and compression, appliances can handle messages larger than their actual memory space.
On another message-related topic, consider applications that do XML transformation between differing schemas; for example, an application that consumes XML purchase orders and must understand a variety of incoming purchase order formats from business partners, and then transforms each into the one “golden” purchase order schema that this company uses. These transformations can be quite expensive to process (see Figure 1-5) and result in bloated application code. We all know that line-for-line, application code is expensive in terms of programmer time, testing, and debugging. Now consider the effect on the application if the transformations were moved out to the appliance on the frontend so that the backend application now gets only the one “golden” schema format. Yes, our application has gone on quite a diet, is less expensive to maintain, and is much faster. One field scenario consisted of a frontend cluster of Java EE applications to do such transformations to keep the cluster of business logic applications behind it lightweight. However, since this was running on a platform that charged for CPU time, and given the overhead of XML transformations shown in Figure 1-5, it was expensive. The solution was to move the transformation layer out to DataPower appliances. The result was a huge cost savings and orders of magnitude faster processing.Integrating Platforms
In the previous section, we discussed a scenario in which the appliance could be used to bridge differences in standards specifications (WS-Security v1.0 versus. v1.1) and identity credentials (SPNEGO versus LTPA) across systems. This is one good example of easily integrating disparate platforms, particularly when the standards and specifications are in flux. It is difficult for software-based solutions running on standard servers and products to keep up with this. On the appliance, you load a firmware update to get the latest and greatest.
However, there are other issues that arise when integrating different platforms. Consider a scenario in which a medium-sized business XYZ Corp has its infrastructure running on legacy platforms and technologies, perhaps mainframe-based EDI. The business partners that they depend on have long since moved their platforms to Web services and are telling poor XYZ Corp that they can no longer afford to support XYZ’s legacy interface to that system, and they must provide a modern SOA or Web services interface or lose the business. This puts XYZ in a bad position; what will it cost to retrain its programmers, rewrite its COBOL applications, and revamp the backends to its Java EE platforms? Likely, it would be a staggering amount! A common solution to this problem is to place appliances at the front of the network as proxies, cook up a WSDL file to describe some Web services, begin receiving the ASCII SOAP messages from the now-happy business partners, and convert them on-the-fly to EBCDIC EDI or COBOL Copybook messages and send them over MQ or IMS Connect to the legacy backend. The backend does not have to change, and no programs have to be rewritten—a win-win!
Due to the variety of protocols (HTTP(S), FTP, MQ, JMS/JFAP, IMS, NFS, TIBCO, MQ, ODBC, SNMP, and so on) supported by the DataPower appliances, there is a wealth of opportunity for protocol bridging, content enrichment, and integration between platforms. Notice that the previous scenario involved message transformation. The XI50 DataPower appliance can handle either XML-to-XML or non-XML transformation scenarios, meaning that messages can be transformed to the appropriate format for any intended backend.
Another common and age-old scenario related to integrating platforms is dynamic routing. Because it is often a requirement to make dynamic routing decisions “on the edge of the network,” we have DMZ Web servers, proxies, and load balancers handle this. The problem is that they can understand only the protocol and not the payload of the message. To accomplish the goal, applications place some value in the protocol header to facilitate the content-based routing. As an example, if we want any purchase orders over one million dollars to be routed to high-priority servers, the sending application would place a cookie or attribute in an HTTP header or URL parameter. The Web server, proxy. or load balancer in the DMZ would be configured to check for this and then route the traffic accordingly. The problem with this scenario is that you have to put this hack in the applications and the HTTP payload, potentially disclose message data to attackers, and involve the sender/client. This solution doesn’t scale because if you continually do this, the HTTP header and application code bloat.
Because SOA appliances are XML-savvy and can use technologies such as XPath, they can check inside the message payload to look for the actual <po_value> element rather than alter the application and HTTP header. If the message is encrypted, you don’t need to expose this by externalizing the data; you can just decrypt the message and check the value, and then route accordingly. The client in this case does not have to be complicit—the routing is truly dynamic and transparent. The XML Aware Network layer is shown in Figure 1-6.
One last important feature in regard to the integration story is the use of appliances as ESBs. The appliances fulfill the model of an ESB by virtue of their strong routing, transformation, mediation, and protocol-switching capabilities. IBM has other ESB products capable of implementing the ESB pattern—WebSphere Message Broker (WMB) and WebSphere Enterprise Service Bus (WESB). Each of these have unique capabilities that may suit them for particular usages. Although DataPower may be thought of as a highly secure and performant ESB, the others have features that DataPower does not have in the arenas of transactionality, persistent message handling, and the capability to work in other programming languages. We discuss ESBs in Chapter 5, “Common DataPower Deployment Patterns,” and Chapter 9, “Multi-Protocol Gateway.”
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