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Test Code : 1Z0-554
Test title : Oracle Application progress Framework(R) 11g Essentials
Vendor title : Oracle
: 96 real Questions

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Oracle Oracle Application progress Framework(R)

Oracle Introduces Free edition of Oracle application edifice Framework | killexams.com real Questions and Pass4sure dumps

REDWOOD SHORES, CA--(Marketwire - Sep 24, 2012) - Oracle ( NASDAQ : ORCL )

news records

Free edition raises entry to effortless application building

  • as the strategic framework used to build many Oracle applications together with Oracle Fusion functions, Oracle ADF is an end-to-end Java Platform, industry edition (Java EE) framework that simplifies utility construction by artery of proposing out-of-the-container infrastructure features and a visible and declarative construction journey.
  • available for down load via Oracle know-how community (OTN), Oracle ADF necessities provides a less complicated no impregnate manner to advance commercial enterprise functions with core capabilities, together with:
  • Oracle ADF Faces: a group of more than a hundred and fifty superior, internet user Interface (UI) add-ons in response to JavaServer Faces (JSF) that simplify the advent of moneyed internet UIs, including interactive data visualization.
  • Oracle ADF Controller: An extension of the JSF controller layer that helps construct complete reusable process flows and gives the capability to create dynamic areas with altering content in web pages.
  • Oracle ADF Binding: gives a simplified approach to connecting person interfaces to quite a few enterprise functions via an XML-based, meta-facts abstraction layer.
  • Oracle ADF company add-ons: Simplifies constructing enterprise capabilities towards relational databases by using providing declaratively-configured, reusable add-ons that implement generic design patterns. Oracle ADF necessities comprises the core points of Oracle ADF, but does not consist of right here enterprise capabilities that are constructed into the entire Oracle ADF: declarative customization, granular safety layer, integration with Oracle SOA Suite and Oracle ADF mobile.
  • aiding fees

  • "Oracle ADF is already proven because the strategic framework used to construct Oracle Fusion applications," mentioned Chris Tonas, vice chairman utility construction equipment, Oracle. "With Oracle ADF essentials we've got combined key tooling from Oracle ADF, Oracle JDeveloper and Oracle commercial enterprise Pack for Eclipse in a free providing that may still subsist a fine means for many of their purchasers and partners to soar birth their construction efforts."
  • "At Innowave know-how they gain been leveraging Oracle ADF to quicken up challenge turn-around time at varied consumer engagements," celebrated Basheer Khan, CEO of Innowave expertise. "Oracle ADF gives us an integrated progress framework with cutting edge functionality and splendid tooling that simplifies their construction method. Having an Oracle ADF version that can subsist used devoid of licensing charges and with the potential to prick on open-supply servers comparable to GlassFish Server Open supply version will allow us to leverage Oracle ADF in additional eventualities and with unusual customers."
  • helping elements

    About Oracle Oracle engineers hardware and application to toil together in the cloud and for your information core. For extra tips about Oracle ( NASDAQ : ORCL ), search recommendation from www.oracle.com.

    About Oracle OpenWorld Oracle OpenWorld San Francisco is probably the most faultfinding academic and networking event of the 12 months for Oracle technologists, shoppers, and companions. This suggestions technology suffer is committed to helping companies optimize existing techniques and subsist mindful upcoming know-how breakthroughs. The convention, which attracts more than 50,000 attendees from over a hundred and ten nations, offers greater than 2,one hundred educational classes, four hundred product demos, exhibitions from 450 companions showcasing purposes, middleware, database, server and storage methods, industries, management and infrastructure -- bar None engineered for innovation. Oracle OpenWorld 2012 is being held September 30-October four at the Moscone core in San Francisco. For extra assistance or to register, tickle talk over with www.oracle.com/openworld. Watch Oracle OpenWorld keynotes, sessions and greater live on YouTube. be a fragment of the Oracle OpenWorld discussion on Twitter, fb and the Oracle OpenWorld blog.

    emblems Oracle and Java are registered trademarks of Oracle and/or its associates. other names may subsist trademarks of their respective homeowners.


    Oracle Launches utility edifice Framework mobile customer | killexams.com real Questions and Pass4sure dumps

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    Oracle JET takes flight with rig for constructing customer applications | killexams.com real Questions and Pass4sure dumps

    The Oracle JavaScript Extension Toolkit, or JET, offers application developers with a modular set of open supply rig for edifice client-side purposes according to industry standards, equivalent to JavaScript, HTML5 and Cascading trend Sheets, or CSS. It comprises Oracle and third-celebration JavaScript libraries for growing purposes that may combine with Oracle items and features, particularly Oracle Cloud choices.

    developers can expend the toolkit to add interactivity to current webpages, equivalent to those in a Fusion application, or to create end-to-end internet functions. Oracle JET can besides subsist used to construct hybrid cellular apps with a glance and believe similar to that of a endemic app.

    The Oracle JET framework comprises such functions as messaging, caching, filtering and sorting. It additionally supports JavaScript logging, pop-up handling, facts conversion, element validation and numerous other elements. moreover, Oracle JET gives connectivity via net features reminiscent of WebSocket and rest.

    Oracle JET aspects and services

    Oracle JET additionally contains numerous features particular to the person interface (UI). for instance, you will locate add-ons that set in constrain the Oracle Alta UI design device, a collection of guidelines and surest practices for implementing a consistent user suffer throughout Oracle applied sciences. The toolkit besides presents developed-in back for accessibility and localization standards, akin to Oracle translation service formats and bidirectional aid; the latter feature permits you to specify even if the language used for your utility reads revise to left or left to appropriate, and then comprises the monitor of the application to the language's orientation.

    The JET know-how helps a kindly design constitution that enables builders to build responsive internet purposes with fluid grids, scalable pictures and CSS media queries that may render layouts conditionally in response to the media character -- as an instance, a plenary monitor or a handheld-sized one. Responsive design makes it feasible to deliver applications which are usable and visually attractive throughout a wide array of devices.

    The responsive capabilities extend to hybrid mobile apps, making it less complicated to goal distinctive devices and monitor sizes. With Oracle JET, builders can construct hybrid apps within the Apache Cordova cell software edifice framework for iOS, Android and home windows mobile gadgets. The apps steer UI behaviors and interactive gestures, such as swipe, progressive facts loading and pull-to-refresh operations.

    The Oracle JET Cookbook is an online repository for descriptions of bar None of the JET add-ons and code snippets to copy and paste into JET applications. builders can flip to the cookbook for HTML and JavaScript examples; it besides offers modifying capabilities that add up to you can alter the samples and cogitate about the effects with no necessity to download the code.

    A library of libraries

    Oracle JET comes with the entire libraries and information integral to build applications that can entry Oracle items and features, both on-premises and in the cloud. moreover, the toolkit includes the data visualization components from the Oracle software construction Framework and various styles of info, akin to polyfills, that extend a browser's capabilities.

    It besides offers CSS and Sassy CSS (SCSS) info for the Alta theme. SCSS is a syntax that became delivered in edition three.0 of Syntactically astonishing vogue Sheets, an extension of CSS commonly known as Sass. The Sass preprocessor generates the CSS files covered within the Oracle JET distribution, the usage of SCSS configuration info that besides compass with the toolkit.

    the majority of the Oracle JET platform is in accordance with a group of JavaScript libraries, a lot of which are open supply, third-birthday celebration libraries that developers can expend to something degree they want. one of the crucial essential of those is jQuery, which makes it more straightforward to maneuver and traverse HTML files and to include animation, wield activities and toil with the Asynchronous JavaScript and XML edifice methodology.

    Oracle JET comprises the jQuery UI library, which offers a group of UI themes, results, widgets and interactions that are bendy and quick to implement. constructed on pleasant of jQuery, the UI library provides Oracle JET with over 70 components that aid augment records entry, facts visualization and responsive UI design.

    moreover, Oracle JET comes with the Knockout library, which gives bindings between add-ons and makes it simpler to affiliate document remonstrate model elements with mannequin facts. This enables an software to immediately supersede the UI when the mannequin's situation alterations. Knockout additionally lets builders define relationship chains between mannequin facts and generate nested UI features as a characteristic of the records.

    The RequireJS library is additionally a fragment of the Oracle JET package, serving as a module loader that manages library references and, because of this, improves code velocity and first-class. With RequireJS, developers can more advantageous manage which libraries secure loaded into their applications, implement sluggish loading to suspend module initialization and create JavaScript partitions that include separate modules.

    Hammer, a different library supported in Oracle JET, brings touchscreen capabilities for each single- and multitouch gestures to the toolkit, including custom gestures.

    Add-on capabilities in Oracle JET

    Oracle JET besides includes facets to augment the capabilities inherent in the framework's libraries. for example, the platform gives a standard mannequin layer for binding to comfort and WebSocket statistics sources. It besides gives a big number of UI accessories, patterns and utilities to expend inside Oracle JET purposes. moreover, it helps the OAuth authentication protocol -- an open protocol for restful standardization -- for managing private information and following foremost practices to cozy the quite a few utility accessories.

    Oracle JET adheres to the mannequin-View-ViewModel (MVVM) structure design pattern, which separates the considerations of the person interface controls and their common sense. MVVM has three different accessories: model, view and account mannequin. during this case, mannequin represents the software facts and cogitate about represents the facts presentation. The toolkit's modular framework helps to steer this pattern, whereas enabling developers to opt for whichever components of the framework toil most fulfilling for their purposes.

    Oracle JET is an open source undertaking disbursed without impregnate under the Oracle-developed well-known Permissive License. The toolkit primarily objectives intermediate and advanced JavaScript developers who want to build Oracle-based customer applications.

    for those who fitting that profile, Oracle JET might aid standardize their JavaScript-based mostly progress and raise their universal efforts. considering the fact that the toolkit is distributed freely, corporations gain minute to lose with the aid of testing it out.


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    Oracle brings Fusion Middleware into the modern age | killexams.com real questions and Pass4sure dumps

    Seeking to compete in the software services age, Oracle today unveiled a modernized version of its Fusion middleware to rob better handicap of cloud computing, SOA, service-oriented security and collaboration.

    The four newly updated components of Fusion Middleware 11g, including Oracle SOA Suite, Oracle WebLogic Suite, Oracle WebCenter Suite and Oracle Identity Management, will serve as a convergence layer for existing and future Fusion applications and services.

    This "convergence layer" will subsist fragment of an integrated stack of Oracle software that, along with a refurbished set of progress tools besides announced today, will give larger IT shops more flexibility and quicken in deploying a ambit of different application strategies, according to Oracle President Charles Phillips.

    "Today what they are proverb is middleware is the convergence layer for everything they are doing, which is striving for a complete stack," Phillips said during a press conference in Washington, D.C. "All the apps they are edifice for the future will gain the identical infrastructure. That is how they will integrate them. If you understand what they are doing with middleware then you know what they are doing with bar None their applications," Phillips said.

    With this announcement it is Oracle's hope, Phillips said, to steer the industry towards offering "pre-fab" environments where products right out of the box are fully integrated and based on accepted industry standards. This will liquidate the necessity for IT shops to serve as their own systems integrators piecing parts together.

    "Vendors throwing stuff over the wall that you gain to assemble is architecture by improvisation. Improvisation is pleasant for jazz musicians but not so pleasant for enterprise architectures," Phillips said. "This is their attempt to gain a system that bar None works together, sort of enjoy the iPod for the enterprise."

    Over the next 100 days Oracle will subsist announcing "a lot" of different announcements that will subsist taking handicap of the unusual Fusion Middleware lineup, but he did not present specifics.

    Some analysts believe the Fusion Middleware 11g is one of the most ambitious undertakings by Oracle the past few years, given the number of unusual enhancements and its strategic implications. They are optimistic however about users' acceptance of the products and strategy.

    "What's positive about this release is the number of customers who gain already tested and proven that these solutions can work," said Ray Wang, a vice president and principal analyst with Forrester Research.

    At today's announcement, Lee Fairclough, vice president with Knoweldge Management, Canadian Partnership Against Cancer, said Oracle 11g WebCenter has made it easier for the organization to customize industry applications within a portal environment as well as helping the company better align IT with its industry goals. "In particular, the tools in Oracle WebCenter Suite 11g will assist us in providing users access to bar None the materials on cancer including the research, guidelines, information and pertinent services and tools to back both patients and families going through an suffer of cancer or those actively working in the cancer system in Canada," she said.

    The cloud and software services capabilities of the unusual products signal that Oracle is edging closer to more meaningful strategies involving those technologies. Company officials issue more inclined to focus on private cloud than public ones given feedback from users.

    "There is a lot of focus around SaaS and the cloud the last six months. Customers want to deliver their IT systems as services," said Hasan Rizvi, senior vice president, Oracle Fusion Middleware Products. "A lot of customers want to carry out that internally and not necessarily through a public cloud."

    The tighter integration between the product families modules and broader solutions, Oracle hopes to build larger IT shops more agile in pursuing a number of different strategic initiatives.

    "The fact is, IT environments are becoming a more strategic element of a company's industry strategy, and as the industry requirements change IT has to become more resilient and able to deal with those changes," Rizvi said.

    Some of the enhancements made across the four product groups include:

  • Oracle SOA Suite 11g can now deployed on the company's application grid infrastructure and is optimized for edifice and integrating services on private and public clouds.
  • Oracle WebLogic Suite 11g now includes Oracle Fusion Middleware GridLink that supports Oracle real Application Clusters and Oracle Fusion Middleware Enterprise Grid Messaging.
  • Oracle WebCenter Suite 11g now contain components that can subsist plugged into several different types of portals to back sociable networking and personal productivity. It besides includes Oracle Composer, a browser-based instrument that lets users and developers to create, share, and personalize applications portals and sociable sites.
  • Oracle Identity Management 11g contains the first components of a fully integrated Identity Management suite and has unusual features including Deployment Accelerators, Universal Federation Framework, and a modern unified user interface based on Oracle's Application progress Framework (ADF) Faces.
  • Another piece of the Fusion Middleware 11g unveiled today is Oracle JDeveloper and Oracle ADF 11g, a unusual team focus and application progress framework that will present desktop integration to office and Java-based applications. Corporate or third party developers can expend the tools separately or in tandem to create Java EE5, Web 2.0 and AJAX-based applications.


    Creating unusual Resource Types | killexams.com real questions and Pass4sure dumps

    This chapter is from the reserve 

    As described in the section "Data Service and Application Agents" in Chapter 2, "Oracle Solaris Cluster: Features and Architecture," Oracle has a substantial list of supported agents that cover most of the applications in your data center. These application agents are maintained by Oracle and are extensively tested on each unusual release of both the Solaris Cluster software and the application itself. Even so, inevitably you will gain an application that is not fragment of the existing agent portfolio.

    Application Suitability

    Before creating a resource character for your application, you must determine whether the application meets the criteria for being made highly available. The following list highlights the main points you must consider. For a complete list note "Analyzing the Application for Suitability" in [SCDevGuide].

  • Is your application crash-tolerant? This is distinguished because in a highly available environment your application must subsist able to regain its data consistency without requiring manual intervention. If the application did require such intervention, then most of the benefits of a high-availability framework would subsist lost.
  • Does your application confidence on the physical node title of the machine, such as that resulting from calls to uname, gethostbyname, or equivalent interfaces? If so, then when the application moves to another cluster node, the dependency on the physical hostname will probably intuition the application to fail. There is a work-around to this problem, which is to interpose the libschost.so.1 library. However, this work-around can sometimes raise back issues with application vendors.
  • Can your application prick on a multihomed system, that is, one with several public networks? Your application must subsist able to wield situations where IP addresses are configured and unconfigured from network adapters as services promenade around the cluster. This has consequences for the artery your application binds to the network.
  • Does your application expend hard-coded path names for the location of its data? If so, then symbolic links might not subsist sufficient to ensure that the data is stored in a location that is compatible with using a failover or global file system. If the application renames a data file, it can smash the symbolic links.
  • After you gain determined that your application is suitable for being made highly available, you gain several ways to achieve the necessary integration:

  • You can expend the Generic Data Service (GDS) directly and just supply the required parameters. Although you cannot define any unusual extension properties for the resource character you create, it is by far the simplest option.
  • You can create a subclass of the GDS to create a completely unusual resource type. This option enables you to define one or more extension properties for your unusual resource type. This option is relatively simple and yet provides considerable flexibility.
  • You can extend the GDS using the Advanced Agent Toolkit. Although this option does not create a unusual resource type, it does enable you to define one or more extension properties. This option is besides relatively simple and provides considerable flexibility.
  • You can expend the GUI scdsbuilder instrument and customize the resulting shell script or C source using the Resource Management API (RMAPI) and the Data Service progress Library (DSDL) APIs. If significant customization toil is needed, this option might result in an increased maintenance burden.
  • You can expend the RMAPI or DSDL APIs directly to develop your resource character from scratch. This option trades the progress and maintenance costs for ultimate flexibility and performance.
  • Each option is discussed in more detail in the following sections.

    Generic Data Service

    The Generic Data Service (GDS) is provided with the Solaris Cluster software. The SUNW.gds agent is packaged in the SUNWscgds package, which is installed as standard by the Solaris Cluster software installer program. The SUNW.gds agent is considered the preferred artery to create both failover and scalable resources. The GDS is supported by Oracle, but you must back the script that you provide for the Start_command, Stop_command, Probe_command, and Validate_command methods.

    By default, the SUNW.gds resource character is not registered, so you must register it before attempting to create a resource of that type. The commands in the following example expose how to determine if the resource character is registered and then how to register it, if it is not already present.

    Example 4.13. Registering the SUNW.gds Resource Type

    Use the clresourcetype command to determine whether the SUNW.gds resource character needs to subsist registered.

    # clresourcetype list | grep SUNW.gds # clresourcetype register SUNW.gds # clresourcetype list | grep SUNW.gds SUNW.gds:6

    In addition to the standard resource properties, the GDS agent has four properties to enable you to integrate your application: Start_command, Stop_command, Probe_command, and Validate_command. These properties are described in "Integrating Your Application-Specific Logic." By using the GDS as the basis for your application, you automatically capitalize from bar None the patches and feature upgrades that the GDS receives.

    Example 4.14 shows how you can expend the GDS to build the X11 program xeyes highly available. You initiate by creating a Start_command program. In this example, a script calls the plenary path title of the program with a parameter that is passed to the shell script. This script must exist on bar None the cluster nodes on which the application is intended to run.

    Next, having checked that the SUNW.gds resource character is registered, you create the resource group. In this example, you allow the resource group's node list to default to bar None the cluster nodes.

    Next, you create a resource to depict your program. In the example, the Start_command property is specified by the script you wrote (and which must exist on bar None nodes). The parade parameter to expend is besides specified. Because this program does not listen on any network ports, you set the network_aware property to false. This means that the probe mechanism used will subsist the continued existence of the xeyes process that the Start_command program leaves running in the background. By default, any resource you create is enabled so that when the resource group is brought online, the resource is automatically started. To change the default, you can specify the -d controversy to the clresource create command.

    The last two steps instruct the RGM that it needs to control or manage the xeyes-rg resource group and then to bring that resource group online. The action of bringing the resource group online starts the resource because it was created in an enabled state.

    Assuming you gain allowed remote X11 clients to parade on your X server using xhost and you gain specified the revise X parade to expend (substitute a value suited to your environment for myhost:1.0), then the xeyes program will issue on your display. You can switch the resource group between nodes and the RGM will destroy the xeyes process and restart it on the unusual node, phys-summer2, as the example shows.

    Example 4.14. Creating a Simple, Highly Available xeyes Service

    List the script that will subsist used to start the xeyes command.

    # cat /tmp/start_xeyes #!/bin/ksh /usr/openwin/demo/xeyes -display $1 & exit 0

    Check that the SUNW.gds resource character is registered, and then create the resource group and resource that will control the xeyes service.

    # clresourcetype list | grep SUNW.gds SUNW.gds:6 # clresourcegroup create xeyes-rg # clresource create -t SUNW.gds > -p start_command="/tmp/start_xeyes myhost:1.0" > -p network_aware=false > -g xeyes-rg xeyes-rs

    Use the clresourcegroup command to bring the xeyes-rg resource group online.

    # clresourcegroup manage xeyes-rg # clresourcegroup online xeyes-rg # clresourcegroup status xeyes-rg === Cluster Resource Groups === Group title Node title Suspended Status ---------- --------- --------- ------ xeyes-rg phys-summer1 No Online phys-summer2 No Offline # clresourcegroup switch -n phys-summer2 xeyes-rg # clresourcegroup status xeyes-rg === Cluster Resource Groups === Group title Node title Suspended Status ---------- --------- --------- ------ xeyes-rg phys-summer1 No Offline phys-summer2 No Online

    To demonstrate how the GDS handles application failure, quit the xeyes program from your X display. You will notice that the RGM restarts the application almost instantaneously. The messages in /var/adm/messages (see example 4.15) indicate that the RGM recognized the failure and restarted the service.

    After the frailty probe determines that the service is online, indicated by Service is online in /var/adm/messages, destroy the process again. The resource has two properties that determine how many times it is restarted by the RGM within a certain time period. These properties are Retry_count and Retry_interval (see example 4.16). After the specified number of failures, the built-in logic of the GDS determines that the current node is unhealthy and releases the service so that it can subsist started on another node. If the service besides experiences problems on this node, then the RGM will not fail the service back to its original node unless the time period, in seconds, as defined by the resource group's Pingpong_interval property, has passed. Instead, the GDS attempts to keep the service running on the remaining node. This behavior is governed by another property called Failover_mode.

    The purpose of the Pingpong_interval property is to prevent a service that fails to start from endlessly looping, resulting in the service migrating back and forth between cluster nodes. In a test environment, you might necessity to reset the value of Pingpong_interval to a lower value. Doing so enables you to restart your service once you gain corrected any problems you encountered.

    Example 4.15. Sample RGM Messages

    The /var/adm/messages file contains information on the situation changes of the resource groups and resources in the cluster.

    Nov 23 04:00:23 phys-summer2 Cluster.RGM.global.rgmd: [ID 529407 daemon.notice] resource group xeyes-rg situation on node phys-summer2 change to RG_ONLINE Nov 23 04:01:23 phys-summer2 Cluster.RGM.global.rgmd: [ID 922363 daemon.notice] resource xeyes-rs status msg on node phys-summer2 change to <Service is online.> Nov 23 04:01:25 phys-summer2 Cluster.PMF.pmfd: [ID 887656 daemon.notice] Process: tag="xeyes-rg,xeyes-rs,0.svc", cmd="/bin/sh -c /tmp/start_xeyes myhost:1.0", Failed to wait up. Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 784560 daemon.notice] resource xeyes-rs status on node phys-summer2 change to R_FM_FAULTED Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 922363 daemon.notice] resource xeyes-rs status msg on node phys-summer2 change to <Service daemon not running.> Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 423137 daemon.error] A resource restart attempt on resource xeyes-rs in resource group xeyes-rg has been blocked because the number of restarts within the past Retry_ interval (370 seconds) would exceed Retry_count (2) Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 874133 daemon.notice] Issuing a failover request because the application exited. Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 494478 daemon.notice] resource xeyes-rs in resource group xeyes-rg has requested failover of the resource group on phys-summer2. Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 423291 daemon.error] RGM isn't failing resource group <xeyes-rg> off of node <phys-summer2>, because there are no other current or potential masters Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 702911 daemon.error] Resource <xeyes-rs> of Resource Group <xeyes-rg> failed pingpong check on node <phys- summer1>. The resource group will not subsist mastered by that node. Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 969827 daemon.error] Failover attempt has failed. Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 670283 daemon.notice] Issuing a resource restart request because the application exited. Example 4.16. Retry, Failover Mode, and Ping-pong Interval Properties

    Use the clresource command to determine the property values of the xeyes-rs resource.

    # clresource expose > -p retry_count,retry_interval,failover_mode xeyes-rs === Resources === Resource: xeyes-rs --- standard and extension properties --- Retry_interval: 370 Class: standard Description: Time in which monitor attempts to restart a failed resource Retry_count times. Type: int Retry_count: 2 Class: standard Description: Indicates the number of times a monitor restarts the resource if it fails. Type: int Failover_mode: SOFT Class: standard Description: Modifies recovery actions taken when the resource fails. Type: enum # clresourcegroup expose -p pingpong_interval xeyes-rg === Resource Groups and Resources === Resource Group: xeyes-rg Pingpong_interval: 3600

    In the preceding example, the parade variable property can subsist changed only by stopping the resource and modifying the Start_command property. Although of minute significance here, because the xeyes program must subsist restarted to change the target X server on which it displays, it does build a dissimilarity in instances where a variable can subsist changed while a service is running. Examples include changing debugging levels to expend and changing directories for log files.

    To create a resource character that has unusual extension properties that can subsist changed when you necessity to change them, you necessity to either write your resource character from scratch or create a subclass of the GDS, as described in a later section.

    Supporting unusual Applications Using the Advanced Agent Toolkit

    Many application agents in the current Solaris Cluster software release are derived from the Advanced Agent Toolkit methodology [AdvGDSTlkit]: HA-PostgreSQL, HA-MySQL, and HA containers, to title three. bar None three expend the SUNW.gds agent as their basis. However, in its raw form, the SUNW.gds agent has some limitations.

    The rationale behind the toolkit is that bar None unusual application agents gain many common requirements:

  • They might require one or more extension properties.
  • They must provide debugging information.
  • They might necessity to disable the process-monitoring facility (pmfadm) for applications that leave no obvious child processes to monitor.
  • They must supply a Start_command script, as a minimum, and possibly Stop_command, Probe_command, and Validate_command scripts.
  • The toolkit besides simplifies much of the toil needed to wield Oracle Solaris Zones and SMF. Thus, providing this extended framework enables your developers to focus on the application-specific integration toil rather than on debugging the framework itself. After the toil is complete, the unusual resource character is registered using a registration script.

    Developing Resource Types by Creating a Subclass of the GDS

    The handicap of creating a subclass of the GDS, rather than writing a unusual resource character from scratch, is that the unusual resource character inherits bar None the best practices that are already fragment of the standard GDS code. In addition, creating a subclass of the GDS enables you to create your own resource character extension properties while retaining the identical flat of flexibility as if you had started from scratch. Finally, your unusual resource type, which is a subclass of the GDS, has a separate name, enabling you to easily distinguish resources of the unusual resource type. If you instead used the Advanced Agent Toolkit or the SUNW.gds agent, then you would gain to determine what the resource is by examining the extension properties or reviewing the code. This step would subsist necessary because the resource character would subsist set to SUNW.gds, rather than MYCORP.appsvr, for example.

    You create a subclass of the GDS by creating a resource character registration (RTR) file where the RT_basedir parameter is set to the directory containing binaries used by the standard GDS methods: Start, Stop, Validate, and so on. You then extend the RTR file by defining your own resource character extension properties. Finally, you set the manner parameters in the RTR file to point to your scripts that override the standard GDS behavior.

    Several existing Sun resource types are implemented this way, including the HA-Logical Domain agent (SUNW.ldom), which was covered in the section "Failover Guest Domains" in Chapter 3, "Combining Virtualization Technologies with Oracle Solaris Cluster Software."

    The RTR file for the SUNW.ldom resource character is shown in example 4.17. In this RTR file, the RT_basedir parameter is set to the standard directory for the GDS package, that is, /opt/SUNWscgds/bin. Of the standard methods, only Init, Boot, and Validate gain been overridden using programs that are located in the ../../SUNWscxvm/bin directory. Unlike a standard GDS resource type, the Start_command, Stop_command, Probe_command, and Validate_command properties are assigned fixed values and cannot subsist changed. This is indicated by the Tunable = None settings. Furthermore, each command, apart from validate_command, is called with a consistent set of arguments, namely, -R %RS_NAME -T %RT_NAME -G %RG_NAME. The %variable construct is similar to the $variable syntax organize in shell scripts. It means that when a resource of this character is instantiated, expend the names you assigned it as arguments. For example, if you wrote a resource character called FOO.bar and then created a resource group called whizz-rg containing a resource called bang-rs of this type, the controversy passed would subsist -R bang-rs -T FOO.bar -G whizz-rg. With these arguments, you can then build calls to the RMAPI or DSDL APIs to retrieve or set properties.

    In contrast to the Start_command, Stop_command, and Probe_command properties, the Validate_command property does not expend this construct. Instead, the RGM passes the validate command bar None the properties listed for the resource character on the command line. Then the validate command parses this list and determines whether the configuration is valid.

    Example 4.17. RTR File for the SUNW.ldom Resource Type

    The following text shows some of the key parts of the RTR file for the SUNW.ldom resource type:

    . . . RESOURCE_TYPE = "ldom"; VENDOR_ID = SUNW; RT_DESCRIPTION = "Sun Cluster HA for xVM Server SPARC Guest Domains"; RT_version ="1"; API_version = 10; RT_basedir=/opt/SUNWscgds/bin; Init = ../../SUNWscxvm/bin/init_xvm; Boot = ../../SUNWscxvm/bin/boot_xvm; Start = gds_svc_start; Stop = gds_svc_stop; Validate = ../../SUNWscxvm/bin/validate_xvm; Update = gds_update; Monitor_start = gds_monitor_start; Monitor_stop = gds_monitor_stop; Monitor_check = gds_monitor_check; Init_nodes = RG_PRIMARIES; Failover = FALSE; # The paramtable is a list of bracketed resource property declarations # that compass after the resource-type declarations # The property-name declaration must subsist the first attribute # after the open curly of a paramtable entry # # The following are the system defined properties. Each of the system defined # properties gain a default value set for each of the attributes. discover at # man rt_reg(4) for a minute explanation. # { PROPERTY = Start_timeout; MIN = 60; DEFAULT = 300; } { PROPERTY = Stop_timeout; MIN = 60; DEFAULT = 300; } . . . # This is an optional property. Any value provided will subsist used as # the absolute path to a command to invoke to validate the application. # If no value is provided, The validation will subsist skipped. # { PROPERTY = Validate_command; EXTENSION; STRING; DEFAULT = ""; TUNABLE = NONE; DESCRIPTION = "Command to validate the application"; } # This property must subsist specified, since this is the only mechanism # that indicates how to start the application. Since a value must # subsist provided, there is no default. The value must subsist an absolute path. { PROPERTY = Start_command; EXTENSION; STRINGARRAY; DEFAULT = "/opt/SUNWscxvm/bin/control_xvm start -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to start application"; } # This is an optional property. Any value provided will subsist used as # the absolute path to a command to invoke to stop the application. # If no value is provided, signals will subsist used to stop the application. # # It is assumed that Stop_command will not revert until the # application has been stopped. { PROPERTY = Stop_command; EXTENSION; STRING; DEFAULT = "/opt/SUNWscxvm/bin/control_xvm stop -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to stop application"; } # This is an optional property. Any value provided will subsist used as # the absolute path to a command to invoke to probe the application. # If no value is provided, the "simple_probe" will subsist used to probe # the application. # { PROPERTY = Probe_command; EXTENSION; STRING; DEFAULT = "/opt/SUNWscxvm/bin/control_xvm probe -R %RS_NAME -G %RG_NAME -T %RT_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to probe application"; } # This is an optional property. It determines whether the application # uses network to communicate with its clients. # { PROPERTY = Network_aware; EXTENSION; BOOLEAN; DEFAULT = FALSE; TUNABLE = AT_CREATION; DESCRIPTION = "Determines whether the application uses network"; } # This is an optional property, which determines the signal sent to the # application for being stopped. # { PROPERTY = Stop_signal; EXTENSION; INT; MIN = 1; MAX = 37; DEFAULT = 15; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The signal sent to the application for being stopped"; } # This is an optional property, which determines whether to failover when # retry_count is exceeded during retry_interval. # { PROPERTY = Failover_enabled; EXTENSION; BOOLEAN; DEFAULT = TRUE; TUNABLE = WHEN_DISABLED; DESCRIPTION = "Determines whether to failover when retry_count is exceeded during retry_interval"; } # This is an optional property that specifies the log flat GDS events. # { PROPERTY = Log_level; EXTENSION; ENUM { NONE, INFO, ERR }; DEFAULT = "INFO"; TUNABLE = ANYTIME; DESCRIPTION = "Determines the log flat for event based traces"; } { Property = Debug_level; Extension; Per_node; Int; Min = 0; Max = 2; Default = 0; Tunable = ANYTIME; Description = "Debug level"; } { Property = Domain_name; Extension; String; Minlength = 1; Tunable = WHEN_DISABLED; Description = "LDoms Guest Domain name"; } { Property = Migration_type; Extension; Enum { NORMAL, MIGRATE }; Default = "MIGRATE"; Tunable = ANYTIME; Description = "Type of guest domain migration to subsist performed"; } { PROPERTY = Plugin_probe; EXTENSION; STRING; DEFAULT = ""; TUNABLE = ANYTIME; DESCRIPTION = "Script or command to check the guest domain"; } { PROPERTY = Password_file; EXTENSION; STRING; DEFAULT = ""; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The complete path to the file containing the target host password"; } scdsbuilder GUI

    To customize an agent beyond what is permitted by the GDS, you can expend the Agent Builder command, scdsbuilder (see the scdsbuilder(1HA) man page). This command has three code generation options, and the resulting files are wrapped in a Solaris package that you can install on your cluster nodes:

  • DSDL code (see the section "Data Service progress Library").
  • ksh code, including bar None the necessary scha_control commands (see the section "Resource Management API"). With the ksh code, you are creating your own resource type.
  • A ksh registration script for a GDS agent. Here, the code generates the appropriate clresource create command.
  • You can customize the resulting code to your specific needs. However, with the ksh registration script for the GDS agent, the scope for modification is limited. The example in pattern 4.7 shows the expend of the third option.

    Figure 4.7

    Figure 4.7 Using the scdsbuilder GUI to create a unusual resource type

    The scdsbuilder command starts the Solaris Cluster Agent Builder GUI, as shown in pattern 4.7. In this example, data has already been specified for each domain available to the user. A short code of SUNW is specified for the vendor name, and tstgds is specified for the application name. This data is then used to generate both the title of the package that Agent Builder creates for you and the title of the resource character that you will subsequently use.

    The information you provide in the other fields is used as follows:

  • The RT version enables you to specify a version number for this resource type. You can identify which version of the agent you are running when it is placed into production.
  • The working directory is used by Agent Builder as a working belt in which it can create your package and write other associated, intermediate files.
  • Your target application determines whether you select the scalable or failover option. If a particular instance of an application can prick on multiple nodes at once without corrupting any of its data files, then you can select the scalable option. A pleasant example of such an application is a web server. For bar None other applications, such as databases and file services, select the failover option.
  • The Network vigilant check box is used to determine whether any resource created using this resource character needs to gain the port_list property set. The port_list property is then used by the GDS service to provide a simple probe mechanism.
  • The source character option determines whether the resulting code uses the C programming language, ksh, or the GDS (see the section "SUNW.gds" in Chapter 2, "Oracle Solaris Cluster: Features and Architecture") to create the data service. To expend the C option, you must gain a C compiler installed on your system.
  • After you gain entered the data and clicked on the Next button, you are presented with the screen shown in pattern 4.8.

    Figure 4.8

    Figure 4.8 Completing the resource character definition using scdsbuilder

    Integrating Your Application-Specific Logic

    You expend the fields in this second screen to provide the location of the programs (which can subsist compiled executables or scripts) and their associated arguments that will subsist used to start, stop, probe, and validate your data service when it is installed on the target cluster nodes. For each program, you can set a time confine on how long it can rob for the program to complete. If the program does not complete within the allocated time period, then the resource is placed into a failed state, such as STOP_FAILED.

    You are required to provide a value only for the start program. bar None the other programs are optional. Any programs specified must exit with a revert code of zero only when they gain successfully completed their work. If they fail to perform their allotted task, they must revert a value greater than 100. Values below that are used by the Solaris Cluster commands and gain specific meanings (see the intro(1CL) man page).

    The programs you apportion to the start and stop commands must revert successfully only when your target application has actually completed the pertinent operation. If the stop command leaves the application under its control running, or not completely stopped, but the stop command returns successfully, then the cluster framework erroneously determines that it is safe to start the resource group on another cluster node. In some instances, particularly when the application uses a global file system, this outcome could result in data corruption because the two instances of the application could write to their data files in an uncontrolled fashion.

    If no stop command is provided, the process tree that results from the start command is terminated using the destroy command.

    The validate command enables you to check that your application is correctly configured on bar None the potential nodes on which it can run. Again, if the program determines that your application is misconfigured, the validate program must exit with a nonzero exit code.

    The capability to incorporate a probe command is one of the key benefits of using the Solaris Cluster framework. A probe command enables you to write a program that determines the health of your application. As an example, if you are writing a probe for a database, you could test whether it can execute basic SQL statements, such as creating or deleting a table, or adding or deleting a record. If you carry out not provide a probe script, then default methods are used instead.

    For non-network-aware applications, the process-monitoring command pmfadm (see the pmfadm(1M) man page) monitors the process tree spawned by your start command. Only if bar None the processes gain failed will the cluster framework attempt to restart the service. Therefore, if your service consists of multiple processes and only one process fails, then pmfadm will not recognize this frailty unless it causes bar None the other processes to fail as well. Consequently, if you necessity to monitor your application with a higher degree of granularity, you must provide a custom frailty probe.

    If the application is network-aware, then the default probe tries to open the port listed in the port_list property. Because this is a simple probe, it makes no attempt to retrieve any data. Even if the default probe successfully opens the ports, that does not necessarily indicate overall application health.

    In the preceding example, you would install the package generated by scdsbuilder on bar None your cluster nodes. You would then register the unusual resource character so that you could create unusual resources of this type. When the RGM is requested to create a resource, it calls the validate command: /usr/local/bin/my_validate -o some_param. If that command succeeds and you enable the resource, the RGM calls the /usr/local/bin/my_start -r foo-rs -g bar-rg command. In both cases, the initial arguments are fixed, but you can modify them subsequently using the clresource command.

    Resource character Registration File

    If you settle to write an agent from scratch using either the RMAPI or DSDL APIs, you must first recount the properties of your proposed resource character in a file known as the resource character registration (RTR) file. This file provides the RGM with details on which programs to convoke and which variables are required to control the particular application.

    Example 4.18 shows an extract from the SUNW.LogicalHostname RTR file. As the example shows, bar None the programs for this resource character are located in the directory defined by RT_BASEDIR. The RTR file besides defines programs that will, among other tasks, start, stop, and probe (Monitor_start) the ratiocinative IP address that the resource plumbs. These addresses are, in turn, defined in the HostnameList property.

    The extension properties you define are bar None application-specific. They could, for example, advert to the location of the software binaries, that is, the application home directory. If a property has a default value, then you can define it in the RTR file to redeem your system administrator from having to override it each time he or she creates a resource of this type. Furthermore, you can region limits on what values certain properties can rob and when they can subsist changed.

    Example 4.18. Extract from the SUNW.LogicalHostname RTR File

    The following text shows some of the key parts of the RTR file for the SUNW.LogicalHostname resource type:

    # # Copyright 1998-2008 Sun Microsystems, Inc. bar None rights reserved. # expend is matter to license terms. # #ident "@(#)SUNW.LogicalHostname 1.20 08/05/20 SMI" # Registration information and Paramtable for HA Failover IPaddress # # NOTE: Keywords are case insensitive, i.e. users may expend any # capitalization style they wish # RESOURCE_TYPE ="LogicalHostname"; VENDOR_ID = SUNW; RT_DESCRIPTION = "Logical Hostname Resource Type"; SYSDEFINED_TYPE = LOGICAL_HOSTNAME; RT_VERSION ="3"; API_VERSION = 2; INIT_NODES = RG_PRIMARIES; RT_BASEDIR=/usr/cluster/lib/rgm/rt/hafoip; FAILOVER = TRUE; # To enable Global_zone_override GLOBAL_ZONE = TRUE; START = hafoip_start; STOP = hafoip_stop; PRENET_START = hafoip_prenet_start; VALIDATE = hafoip_validate; UPDATE = hafoip_update; MONITOR_START = hafoip_monitor_start; MONITOR_STOP = hafoip_monitor_stop; MONITOR_CHECK = hafoip_monitor_check; PKGLIST = SUNWscu; # # Upgrade directives # #$upgrade #$upgrade_from "1.0" anytime #$upgrade_from "2" anytime # The paramtable is a list of bracketed resource property declarations # that compass after the resource-type declarations # The property-name declaration must subsist the first attribute # after the open curly of a paramtable entry # # The Paramtable cannot contain TIMEOUT properties for methods # that aren't in the RT { PROPERTY = Start_timeout; MIN=360; DEFAULT=500; } . . . # HostnameList: List of hostnames managed by this resource. bar None must be # on the identical subnet. If necessity > 1 subnet with a RG, create as many # resources as there are subnets. { PROPERTY = HostnameList; EXTENSION; STRINGARRAY; TUNABLE = AT_CREATION; DESCRIPTION = "List of hostnames this resource manages"; } . . . Resource Management API

    The Resource Management API (RMAPI) is a set of low-level functions contained in the libscha.so library with both C and shell interfaces. bar None the function names provided by this interface are prefixed with scha_. The shell interfaces are listed in section 1HA of the Solaris Cluster manual pages.

    The ksh scripts generated by the Agent Builder are built using these commands, so you can insert additional lines in this code where the comments indicate. However, for greater control over the logic imposed on your application you must write your application agent from scratch.

    Data Service progress Library

    The Data Service progress Library (DSDL) is a set of higher-level functions encapsulated in the libdsdev.so library that builds on the RMAPI functionality. This library can only subsist accessed using a C programming language interface. Consequently, it is potentially more time-consuming to write a complete application agent using this approach, although it does present the greatest flat of performance and flexibility.

    If you used Agent Builder to create a resource type, you can customize it by inserting extra DSDL code where the comments indicate. Otherwise, you must write your agent from scratch.

    All the function names provided by the library are prefixed with scds_ and are documented in section 3HA of the Solaris Cluster manual pages. The NFS agent source code [NFSAgent] serves as a pleasant example of how these APIs are used. Using the nfs_svc_start.c source as a specific example, the library is initialized with scds_initialize(). Resource and resource group names are then retrieved using scds_get_resource_name() and scds_get_resource_group_name() calls, respectively. Finally, the status of the resource is set by the RMAPI scha_resource_setstatus() call. Most of the coding endeavor involved with using these interfaces is consumed by the logic that describes how the agent should behave in various failure scenarios. For example, how many times should the agent attempt to restart the service before giving up and potentially failing over? What should the agent carry out in response to a network failure?

    One handicap of using the GDS is that bar None the best practices for service behavior are already in the logic of the code that makes up the agent, saving you from re-creating that code.

    Useful Utilities for edifice Custom Data Services

    The Solaris Cluster software comes with two programs that you will find very useful if you create your resource character from scratch: hatimerun (see the hatimerun(1M) man page) and pmfadm.

    hatimerun Command

    Throughout the Start, Stop, Monitor_start, and Validate methods of your resource type, you will necessity to prick various programs to perform the required logic steps. Because your goal is high availability, you cannot wait for a program that might never respond or return, whether that program has gone into a loop or is unable to retrieve some distinguished data from the network, disk, or other program. Consequently, you must region time constraints on the duration of the program's execution. This is the function of the hatimerun command. It enables you to execute a program under its control and set a confine on the time it can rob to respond. If the program in question fails to respond in a timely fashion, it is terminated by default.

    The hatimerun command besides enables you to leave the program running asynchronously in the background, change the exit code returned after a timeout, or expend a particular signal to terminate your program.

    The most common usage of this command is in your probe commands or in the steps leading up to stopping or starting your application.

    pmfadm Command

    If you write a custom probe for your service, you settle what constitutes a healthy service. The criteria might include application-specific checks to determine if the data it is delivering to potential clients is valid or timely. If the application consists of multiple processes, you might want to check that each process is running, using the ps command. bar None of these tests combine to give you the best assessment of your application's current health. However, your probe is scheduled to build its checks only at regular intervals. Even though you can tune these checks to occur at shorter intervals, doing so results in a greater load on your system. Consequently, you must wait, on average, half the probe epoch before your probe detects a situation where your application has completely failed, import that bar None the processes gain exited. Once again, this does not back much toward your goal of high availability.

    The solution is to expend pmfadm, the process-monitoring facility command. When you start your application under pmfadm, it monitors bar None the processes your application spawns to a flat that you determine. By default, it monitors bar None the application's child processes. If they bar None exit, pmfadm immediately restarts your application for you on the condition that it has not already exceeded a preset number of restarts within a certain time interval.

    The most common usage of this command is in your start command to ensure that your key application processes are monitored and that complete failures are reacted to immediately.

    libschost.so Library

    Some applications store or build expend of configuration information about the physical hostname of the server on which the application is running. Such applications will most likely fail when the application is placed in a resource group and moved between the nodes of a cluster. This failure occurs because calls to uname or gethostbyname produce different responses on the global zone of each cluster node. Oracle Application Server and the Oracle E-Business Suite are two examples of programs that risk such failures [LibHost].

    To overcome this limitation, you expend the LD_PRELOAD feature to enable the runtime linker to interpose the libschost.so.1 library in the dynamic linking process. The following example shows how this is done. You can expend the identical construct within your resource Start or Monitor_start (probe) methods, as required.

    Example 4.19. How to expend the sclibhost.so.1 Library to Change the String Returned as the Hostname

    Use the uname command to parade the current hostname.

    # uname -n phys-winter1

    Set the LD_PRELOAD_32, LD_PRELOAD_64 and SC_LHOSTNAME environment variables, and then rerun the uname command.

    # LD_PRELOAD_32=$LD_PRELOAD_32:/usr/cluster/lib/libschost.so.1 # LD_PRELOAD_64=$LD_PRELOAD_64:/usr/cluster/lib/64/libschost.so.1 # SC_LHOSTNAME=myhost # export SC_LHOSTNAME LD_PRELOAD_32 LD_PRELOAD_64 # uname -n myhost


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