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Test Code : 1Z0-879
Test designation : Oracle Solaris 10 System Administrator(R) Certified Professional Upgrade
Vendor designation : Oracle
braindumps : 612 existent Questions

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Oracle Solaris 10 System Administrator(R) Certified Professional Upgrade exam

growing New resource types | 1Z0-879 existent Questions and VCE rehearse Test

This chapter is from the ebook 

As described within the locality "information service and utility brokers" in Chapter 2, "Oracle Solaris Cluster: aspects and architecture," Oracle has a substantial listing of supported brokers that cowl many of the purposes for your records middle. These utility agents are maintained by using Oracle and are notably demonstrated on each new free up of each the Solaris Cluster application and the application itself. having said that, inevitably you could contain an application that is not a allotment of the latest agent portfolio.

utility Suitability

earlier than creating a resource character in your software, you must examine whether the software meets the criteria for being made highly purchasable. birthright here checklist highlights the main points you should harmonize with. For an entire list survey "analyzing the utility for Suitability" in [SCDevGuide].

  • Is your application crash-tolerant? this is requisite because in a incredibly obtainable ambiance your application should exist able to ameliorate its statistics consistency with out requiring manual intervention. If the application did require such intervention, then most of the advantages of a high-availability framework can exist misplaced.
  • Does your software matter on the actual node identify of the desktop, similar to that as a result of calls to uname, gethostbyname, or equivalent interfaces? if so, then when the application moves to a further cluster node, the dependency on the actual hostname will probably trigger the utility to fail. there's a piece-round to this issue, which is to interpose the libschost.so.1 library. besides the fact that children, this work-round can from time to time raise back issues with utility companies.
  • Can your software race on a multihomed equipment, it truly is, one with a number of public networks? Your utility should exist in a position to tackle situations the location IP addresses are configured and unconfigured from community adapters as services flood around the cluster. This has consequences for the style your software binds to the community.
  • Does your software expend difficult-coded route names for the vicinity of its data? in that case, then symbolic hyperlinks may no longer exist adequate to construct sure that the facts is saved in a location it really is appropriate with the expend of a failover or world file equipment. If the software renames an information file, it could actually spoil the symbolic links.
  • upon getting decided that your utility is suitable for being made extremely available, you contain a few the birthright pass to achieve the necessary integration:

  • that you would exist able to expend the regular facts service (GDS) directly and simply supply the mandatory parameters. besides the fact that children you can't define any new extension properties for the aid character you create, it is via a long pass the easiest option.
  • that you can create a subclass of the GDS to create a very new aid type. This alternative enables you to define one or greater extension residences in your new aid classification. This option is relatively fundamental and yet offers appreciable flexibility.
  • that you could extend the GDS the usage of the superior Agent Toolkit. despite the fact this altenative does not create a new aid class, it does permit you to define one or greater extension properties. This option is additionally rather measure and gives appreciable flexibility.
  • that you could expend the GUI scdsbuilder implement and customise the ensuing shell script or C supply the expend of the aid administration API (RMAPI) and the records provider pile Library (DSDL) APIs. If huge customization travail is required, this option may effect in an elevated maintenance burden.
  • that you may expend the RMAPI or DSDL APIs without detain to develop your resource character from scratch. This alternative trades the pile and renovation expenses for optimal flexibility and efficiency.
  • each altenative is discussed in additional aspect in birthright here sections.

    widespread statistics provider

    The prevalent information provider (GDS) is equipped with the Solaris Cluster software. The SUNW.gds agent is packaged within the SUNWscgds package, which is installed as ordinary by means of the Solaris Cluster application installer software. The SUNW.gds agent is regarded the preferred approach to create both failover and scalable substances. The GDS is supported by Oracle, but you ought to assist the script that you simply deliver for the Start_command, Stop_command, Probe_command, and Validate_command strategies.

    through default, the SUNW.gds aid classification isn't registered, so that you contain to register it earlier than attempting to create a useful resource of that type. The commands in birthright here example betray a pass to check if the useful resource character is registered and then the pass to register it, whether it is now not already present.

    illustration four.13. Registering the SUNW.gds resource class

    Use the clresourcetype command to examine whether the SUNW.gds useful resource character must exist registered.

    # clresourcetype listing | grep SUNW.gds # clresourcetype register SUNW.gds # clresourcetype checklist | grep SUNW.gds SUNW.gds:6

    besides the measure resource homes, the GDS agent has four houses to allow you to combine your software: Start_command, Stop_command, Probe_command, and Validate_command. These residences are described in "Integrating Your utility-specific logic." by using the GDS as the foundation to your utility, you immediately capitalize from All of the patches and contain improvements that the GDS receives.

    illustration 4.14 shows tips on how to expend the GDS to construct the X11 program xeyes totally accessible. You inaugurate through making a Start_command program. in this illustration, a script calls the total route designation of the software with a parameter it truly is passed to the shell script. This script should exist on All of the cluster nodes on which the utility is supposed to run.

    next, having checked that the SUNW.gds aid category is registered, you create the useful resource community. in this example, you permit the aid community's node listing to default to All of the cluster nodes.

    subsequent, you create a resource to characterize your program. in the illustration, the Start_command property is sure with the aid of the script you wrote (and which should exist on All nodes). The array parameter to expend is too exact. as a result of this software does not hear on any community ports, you location the network_aware property to false. This talent that the probe mechanism used could exist the persevered being of the xeyes process that the Start_command software leaves running within the heritage. via default, any resource you create is enabled so that when the aid community is brought online, the useful resource is immediately began. To alternate the default, you can specify the -d argument to the clresource create command.

    The final two steps teach the RGM that it should wield or manage the xeyes-rg useful resource community and then to convey that resource community on-line. The action of bringing the resource neighborhood online begins the useful resource since it became created in an enabled state.

    Assuming you contain allowed far off X11 valued clientele to array in your X server the usage of xhost and you contain distinctive the revise X betray to construct expend of (exchange a cost appropriate to your atmosphere for myhost:1.0), then the xeyes software will appear on your reveal. which you can switch the resource neighborhood between nodes and the RGM will assassinate the xeyes system and restart it on the new node, phys-summer2, as the example shows.

    example 4.14. developing a simple, enormously purchasable xeyes carrier

    listing the script that may exist used to delivery the xeyes command.

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

    verify that the SUNW.gds aid category is registered, and then create the aid neighborhood and useful resource as a pass to wield the xeyes service.

    # clresourcetype record | 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 convey the xeyes-rg resource group online.

    # clresourcegroup manage xeyes-rg # clresourcegroup on-line xeyes-rg # clresourcegroup repute xeyes-rg === Cluster aid groups === community identify Node identify Suspended fame ---------- --------- --------- ------ xeyes-rg phys-summer1 No online phys-summer2 No Offline # clresourcegroup swap -n phys-summer2 xeyes-rg # clresourcegroup reputation xeyes-rg === Cluster useful resource organizations === group designation Node identify Suspended popularity ---------- --------- --------- ------ xeyes-rg phys-summer1 No Offline phys-summer2 No online

    To exhibit how the GDS handles application failure, halt the xeyes application out of your X screen. you are going to notice that the RGM restarts the software basically straight away. The messages in /var/adm/messages (see illustration 4.15) point out that the RGM diagnosed the failure and restarted the service.

    After the vice probe determines that the service is online, indicated via provider is on-line in /var/adm/messages, assassinate the fashion again. The aid has two homes that verify how many times it's restarted by means of the RGM inside a undeniable time length. These properties are Retry_count and Retry_interval (see example 4.16). After the discrete variety of screw ups, the developed-in common sense of the GDS determines that the latest node is unhealthy and releases the service so that it will too exist All started on another node. If the service too experiences issues on this node, then the RGM will now not fail the provider lower back to its long-established node until the time period, in seconds, as defined by pass of the resource neighborhood's Pingpong_interval property, has passed. instead, the GDS attempts to maintain the provider working on the ultimate node. This deportment is ruled by means of one more property referred to as Failover_mode.

    The direct of the Pingpong_interval property is to keep away from a provider that fails to start from perpetually looping, resulting within the service migrating from side to side between cluster nodes. In a check ambiance, you could should reset the value of Pingpong_interval to a lessen value. Doing so allows for you to restart your service after getting corrected any problems you encountered.

    instance 4.15. pattern RGM Messages

    The /var/adm/messages file consists of information on the state alterations of the aid businesses and elements in the cluster.

    Nov 23 04:00:23 phys-summer2 Cluster.RGM.world.rgmd: [ID 529407 daemon.notice] useful resource neighborhood xeyes-rg state on node phys-summer2 trade to RG_ONLINE Nov 23 04:01:23 phys-summer2 Cluster.RGM.international.rgmd: [ID 922363 daemon.notice] useful resource xeyes-rs fame msg on node phys-summer2 trade to <provider is on-line.> Nov 23 04:01:25 phys-summer2 Cluster.PMF.pmfd: [ID 887656 daemon.notice] system: tag="xeyes-rg,xeyes-rs,0.svc", cmd="/bin/sh -c /tmp/start_xeyes myhost:1.0", Failed to dwell up. Nov 23 04:01:25 phys-summer2 Cluster.RGM.international.rgmd: [ID 784560 daemon.notice] useful resource xeyes-rs status on node phys-summer2 alternate to R_FM_FAULTED Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 922363 daemon.notice] aid xeyes-rs fame msg on node phys-summer2 alternate to <provider daemon no longer operating.> 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 useful resource neighborhood xeyes-rg has been blocked because the number of restarts within the previous 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 since the utility exited. Nov 23 04:01:25 phys-summer2 Cluster.RGM.international.rgmd: [ID 494478 daemon.notice] resource xeyes-rs in useful resource neighborhood xeyes-rg has requested failover of the aid group on phys-summer2. Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 423291 daemon.error] RGM is never failing aid group <xeyes-rg> off of node <phys-summer2>, as a result of there are no different present or competencies masters Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 702911 daemon.error] aid <xeyes-rs> of aid neighborhood <xeyes-rg> failed pingpong investigate on node <phys- summer1>. The aid community aren't mastered by means of 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 since the utility exited. instance 4.16. Retry, Failover Mode, and Ping-pong Interval properties

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

    # clresource betray > -p retry_count,retry_interval,failover_mode xeyes-rs === substances === aid: xeyes-rs --- established and extension properties --- Retry_interval: 370 class: common Description: Time by which computer screen attempts to restart a failed resource Retry_count instances. class: int Retry_count: 2 type: general Description: shows the number of instances a computer screen restarts the resource if it fails. category: int Failover_mode: soft type: usual Description: Modifies restoration movements taken when the resource fails. class: enum # clresourcegroup exhibit -p pingpong_interval xeyes-rg === aid groups and materials === useful resource neighborhood: xeyes-rg Pingpong_interval: 3600

    in the previous example, the monitor variable property can exist modified only via stopping the aid and editing the Start_command property. however of puny significance birthright here, since the xeyes program contain to exist restarted to alternate the goal X server on which it displays, it does construct a change in instances the location a variable can exist modified while a carrier is running. Examples encompass changing debugging tiers to expend and changing directories for log data.

    To create a useful resource classification that has new extension residences that can exist modified should you requisite to alternate them, you should both write your useful resource category from scratch or create a subclass of the GDS, as described in a later area.

    helping New applications the expend of the advanced Agent Toolkit

    Many utility brokers in the existing Solaris Cluster utility unencumber are derived from the superior Agent Toolkit methodology [AdvGDSTlkit]: HA-PostgreSQL, HA-MySQL, and HA containers, to identify three. All three expend the SUNW.gds agent as their groundwork. however, in its raw form, the SUNW.gds agent has some barriers.

    The motive at the back of the toolkit is that each one new software brokers contain many middling requirements:

  • They may require one or more extension homes.
  • They requisite to provide debugging information.
  • They might deserve to disable the process-monitoring facility (pmfadm) for functions that leave no glaring newborn procedures to video display.
  • They ought to provide a Start_command script, at least, and probably Stop_command, Probe_command, and Validate_command scripts.
  • The toolkit additionally simplifies plenty of the travail vital to wield Oracle Solaris Zones and SMF. as a consequence, presenting this prolonged framework makes it possible for your developers to heart of attention on the application-particular integration travail instead of on debugging the framework itself. After the travail is finished, the new resource category is registered the usage of a registration script.

    developing useful resource forms with the aid of making a Subclass of the GDS

    The expertise of creating a subclass of the GDS, in location of writing a brand new useful resource category from scratch, is that the new useful resource classification inherits the entire most beneficial practices which are already allotment of the accustomed GDS code. additionally, creating a subclass of the GDS permits you to create your personal useful resource classification extension houses whereas maintaining the identical stage of flexibility as in case you had started from scratch. at last, your new resource classification, which is a subclass of the GDS, has a limpid name, enabling you to effectively distinguish components of the brand new useful resource type. in case you as an alternative used the advanced Agent Toolkit or the SUNW.gds agent, then you would requisite to examine what the aid is through examining the extension homes or reviewing the code. This step would exist censorious since the aid classification can exist set to SUNW.gds, in preference to MYCORP.appsvr, for example.

    You create a subclass of the GDS with the aid of making a resource character registration (RTR) file where the RT_basedir parameter is set to the directory containing binaries used with the aid of the established GDS strategies: delivery, cease, Validate, and so forth. then you definitely lengthen the RTR file by using defining your own aid class extension properties. finally, you keep the components parameters in the RTR file to factor to your scripts that override the typical GDS habits.

    a yoke of present sun aid varieties are implemented this way, together with the HA-Logical locality agent (SUNW.ldom), which become covered in the locality "Failover guest Domains" in Chapter 3, "Combining Virtualization technologies with Oracle Solaris Cluster software."

    The RTR file for the SUNW.ldom aid category is proven in instance four.17. during this RTR file, the RT_basedir parameter is set to the common listing for the GDS kit, that is, /opt/SUNWscgds/bin. Of the common strategies, simplest Init, Boot, and Validate had been overridden the expend of classes that can exist establish within the ../../SUNWscxvm/bin directory. unlike a common GDS aid class, the Start_command, Stop_command, Probe_command, and Validate_command properties are assigned fastened values and can't exist modified. here's indicated by the Tunable = not anything settings. furthermore, each command, apart from validate_command, is referred to as with a constant set of arguments, namely, -R %RS_NAME -T %RT_NAME -G %RG_NAME. The %variable assemble is corresponding to the $variable syntax establish in shell scripts. It means that after a useful resource of this character is instantiated, expend the names you assigned it as arguments. as an example, in case you wrote a resource category referred to as FOO.bar and then created a aid group known as whizz-rg containing a resource referred to as bang-rs of this class, the argument passed can exist -R bang-rs -T FOO.bar -G whizz-rg. With these arguments, which you can then construct calls to the RMAPI or DSDL APIs to retrieve or set homes.

    In contrast to the Start_command, Stop_command, and Probe_command houses, the Validate_command property doesn't expend this assemble. as a substitute, the RGM passes the validate command All of the properties listed for the useful resource category on the command line. Then the validate command parses this list and determines whether the configuration is valid.

    instance 4.17. RTR File for the SUNW.ldom resource classification

    right here textual content suggests one of the vital key materials of the RTR file for the SUNW.ldom useful 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=/decide/SUNWscgds/bin; Init = ../../SUNWscxvm/bin/init_xvm; Boot = ../../SUNWscxvm/bin/boot_xvm; beginning = gds_svc_start; cease = 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 listing of bracketed resource property declarations # that approach after the aid-category declarations # The property-identify announcement requisite to exist the first attribute # after the open curly of a paramtable entry # # here are the gadget described homes. each of the gadget defined # properties contain a default cost set for each of the attributes. examine # man rt_reg(four) for a circumstantial clarification. # PROPERTY = Start_timeout; MIN = 60; DEFAULT = 300; PROPERTY = Stop_timeout; MIN = 60; DEFAULT = 300; . . . # here is an optional property. Any value provided can exist used as # absolutely the path to a command to invoke to validate the application. # If no cost is equipped, The validation can exist skipped. # PROPERTY = Validate_command; EXTENSION; STRING; DEFAULT = ""; TUNABLE = NONE; DESCRIPTION = "Command to validate the utility"; # This property should exist particular, on the grounds that this is the most efficacious mechanism # that shows how to delivery the utility. seeing that a worth should # exist offered, there is not any default. The cost requisite to exist an absolute course. PROPERTY = Start_command; EXTENSION; STRINGARRAY; DEFAULT = "/decide/SUNWscxvm/bin/control_xvm birth -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to start utility"; # this is an not obligatory property. Any cost offered should exist used as # absolutely the path to a command to invoke to halt the application. # If no cost is supplied, signals could exist used to cease the application. # # It is thought that Stop_command will no longer return until the # application has been stopped. PROPERTY = Stop_command; EXTENSION; STRING; DEFAULT = "/choose/SUNWscxvm/bin/control_xvm cease -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to cease application"; # here's an not obligatory property. Any value supplied can exist used as # the absolute route to a command to invoke to probe the software. # If no value is equipped, the "simple_probe" can exist used to probe # the utility. # PROPERTY = Probe_command; EXTENSION; STRING; DEFAULT = "/decide/SUNWscxvm/bin/control_xvm probe -R %RS_NAME -G %RG_NAME -T %RT_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to probe utility"; # here's an optional property. It determines whether the utility # makes expend of community to communicate with its purchasers. # PROPERTY = Network_aware; EXTENSION; BOOLEAN; DEFAULT = FALSE; TUNABLE = AT_CREATION; DESCRIPTION = "Determines whether the application makes expend of community"; # this is an not obligatory 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 badge despatched to the application for being stopped"; # this is an optional property, which determines even if to failover when # retry_count is handed throughout retry_interval. # PROPERTY = Failover_enabled; EXTENSION; BOOLEAN; DEFAULT = true; TUNABLE = WHEN_DISABLED; DESCRIPTION = "Determines whether to failover when retry_count is handed all over retry_interval"; # this is an optional property that specifies the log stage GDS movements. # PROPERTY = Log_level; EXTENSION; ENUM NONE, info, ERR ; DEFAULT = "info"; TUNABLE = every time; DESCRIPTION = "Determines the log stage for event based mostly traces"; Property = Debug_level; Extension; Per_node; Int; Min = 0; Max = 2; Default = 0; Tunable = each time; Description = "Debug stage"; Property = Domain_name; Extension; String; Minlength = 1; Tunable = WHEN_DISABLED; Description = "LDoms guest domain name"; Property = Migration_type; Extension; Enum common, MIGRATE ; Default = "MIGRATE"; Tunable = each time; Description = "category of visitor domain migration to exist carried out"; PROPERTY = Plugin_probe; EXTENSION; STRING; DEFAULT = ""; TUNABLE = every time; DESCRIPTION = "Script or command to verify the guest domain"; PROPERTY = Password_file; EXTENSION; STRING; DEFAULT = ""; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The complete route to the file containing the target host password"; scdsbuilder GUI

    To personalize an agent past what is accredited through the GDS, which you can expend the Agent Builder command, scdsbuilder (see the scdsbuilder(1HA) man page). This command has three code technology alternate options, and the ensuing files are wrapped in a Solaris kit so you might installation to your cluster nodes:

  • DSDL code (see the section "statistics carrier construction Library").
  • ksh code, including All of the requisite scha_control commands (see the allotment "aid management API"). With the ksh code, you are growing your own resource category.
  • A ksh registration script for a GDS agent. birthright here, the code generates the acceptable clresource create command.
  • that you may customise the resulting code to your sure needs. however, with the ksh registration script for the GDS agent, the scope for modification is restricted. The instance in determine four.7 suggests the expend of the third alternative.

    Figure 4.7

    figure 4.7 the expend of the scdsbuilder GUI to create a new useful resource type

    The scdsbuilder command starts the Solaris Cluster Agent Builder GUI, as shown in pattern 4.7. in this instance, records has already been circumstantial for every box accessible to the person. a brief code of SUNW is unique for the supplier identify, and tstgds is discrete for the software identify. This facts is then used to generate both the identify of the kit that Agent Builder creates for you and the identify of the useful resource classification that you're going to because of this use.

    The tips you supply within the different fields is used as follows:

  • The RT version permits you to specify a version quantity for this useful resource class. which you can identify which version of the agent you're working when it's placed into creation.
  • The working listing is used by using Agent Builder as a working enviornment by which it can create your equipment and write different linked, intermediate info.
  • Your goal software determines even if you opt for the scalable or failover alternative. If a specific instance of an application can race on distinctive nodes without detain without corrupting any of its records information, then that you may select the scalable choice. a answerable example of such an software is an internet server. For All different purposes, corresponding to databases and file features, opt for the failover option.
  • The community mindful verify box is used to verify even if any aid created the expend of this aid class should contain the port_list property set. The port_list property is then used through the GDS carrier to provide a simple probe mechanism.
  • The supply character altenative determines no matter if the resulting code makes expend of the c programming language, ksh, or the GDS (see the allotment "SUNW.gds" in Chapter 2, "Oracle Solaris Cluster: features and structure") to create the data service. to expend the C option, you must contain a C compiler installed for your system.
  • once you contain entered the information and clicked on the next button, you're introduced with the monitor shown in determine four.8.

    Figure 4.8

    determine 4.eight finishing the resource character definition the usage of scdsbuilder

    Integrating Your utility-specific common sense

    you employ the fields in this 2nd screen to give the locality of the classes (which can exist compiled executables or scripts) and their linked arguments that should exist used to delivery, cease, probe, and validate your facts service when it's keep in on the goal cluster nodes. For every application, you can set a deadline on how lengthy it could pick for the application to finished. If the program does not comprehensive within the allocated time duration, then the aid is positioned birthright into a failed state, reminiscent of STOP_FAILED.

    you are required to provide a worth most efficacious for the birth application. All of the different programs are not obligatory. Any classes specific must exit with a return code of zero best when they've effectively completed their work. in the event that they fail to operate their disbursed project, they requisite to return a worth stronger than 100. Values beneath which are used by means of the Solaris Cluster commands and contain selected meanings (see the intro(1CL) man page).

    The programs you allocate to the start and halt instructions ought to return efficiently handiest when your goal software has definitely achieved the pertinent operation. If the halt command leaves the software under its control running, or no longer fully stopped, however the halt command returns correctly, then the cluster framework erroneously determines that it is safe to delivery the resource neighborhood on one other cluster node. In some circumstances, mainly when the software uses a global file equipment, this influence could influence in statistics corruption because the two cases of the software might write to their data files in an uncontrolled vogue.

    If no cease command is provided, the fashion tree that consequences from the birth command is terminated the expend of the assassinate command.

    The validate command enables you to examine that your application is correctly configured on All of the potential nodes on which it could actually run. once again, if the program determines that your application is misconfigured, the validate program contain to exit with a nonzero exit code.

    The means to comprise a probe command is likely one of the key advantages of the usage of the Solaris Cluster framework. A probe command allows you to jot down a software that determines the fitness of your software. for example, when you are writing a probe for a database, you may verify even if it may possibly execute fundamental SQL statements, equivalent to developing or deleting a desk, or adding or deleting a listing. in case you enact not give a probe script, then default methods are used as an alternative.

    For non-community-conscious purposes, the system-monitoring command pmfadm (see the pmfadm(1M) man page) displays the system tree spawned through your delivery command. handiest if All of the procedures contain failed will the cluster framework try to restart the carrier. therefore, in case your service includes discrete strategies and only one fashion fails, then pmfadm will no longer admire this vice unless it factors the entire other procedures to fail as smartly. due to this fact, in case you deserve to computer screen your utility with a stronger diploma of granularity, you ought to give a custom vice probe.

    If the software is network-mindful, then the default probe tries to open the port listed in the port_list property. because here's a simple probe, it makes no attempt to retrieve any statistics. however the default probe efficiently opens the ports, that doesn't necessarily testify middling application health.

    within the preceding instance, you would install the kit generated by means of scdsbuilder on your total cluster nodes. you may then register the brand new useful resource category so that you could create new materials of this type. When the RGM is requested to create a useful 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/native/bin/my_start -r foo-rs -g bar-rg command. In each circumstances, the initial arguments are fastened, however which you can modify them as a result the usage of the clresource command.

    useful resource classification Registration File

    if you pick to write down an agent from scratch using either the RMAPI or DSDL APIs, you contain to first portray the houses of your proposed resource category in a file accepted as the aid class registration (RTR) file. This file gives the RGM with particulars on which programs to designation and which variables are required to manage the selected software.

    instance four.18 shows an extract from the SUNW.LogicalHostname RTR file. because the illustration shows, All of the courses for this aid character are located within the directory defined by RT_BASEDIR. The RTR file additionally defines classes with the intent to, among different tasks, start, cease, and probe (Monitor_start) the rational IP address that the aid plumbs. These addresses are, in turn, defined in the HostnameList property.

    The extension houses you define are All application-specific. They may, for example, treat with the region of the application binaries, it truly is, the utility domestic listing. If a property has a default value, then you could define it in the RTR file to retailer your equipment administrator from having to override it every time she or he creates a aid of this category. additionally, that you could location limits on what values limpid houses can pick and after they will too exist changed.

    illustration four.18. Extract from the SUNW.LogicalHostname RTR File

    right here textual content suggests one of the crucial key constituents of the RTR file for the SUNW.LogicalHostname aid type:

    # # Copyright 1998-2008 sun Microsystems, Inc. All rights reserved. # expend is field to license terms. # #ident "@(#)SUNW.LogicalHostname 1.20 08/05/20 SMI" # Registration assistance and Paramtable for HA Failover IPaddress # # note: key words are case insensitive, i.e. users may too expend any # capitalization style they want # RESOURCE_TYPE ="LogicalHostname"; VENDOR_ID = SUNW; RT_DESCRIPTION = "Logical Hostname aid type"; SYSDEFINED_TYPE = LOGICAL_HOSTNAME; RT_VERSION ="three"; API_VERSION = 2; INIT_NODES = RG_PRIMARIES; RT_BASEDIR=/usr/cluster/lib/rgm/rt/hafoip; FAILOVER = real; # To permit Global_zone_override GLOBAL_ZONE = real; delivery = 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 # #$improve #$upgrade_from "1.0" each time #$upgrade_from "2" every time # The paramtable is a list of bracketed resource property declarations # that approach after the resource-type declarations # The property-name declaration ought to exist the primary attribute # after the open curly of a paramtable entry # # The Paramtable can't contain TIMEOUT homes for methods # that are not within the RT PROPERTY = Start_timeout; MIN=360; DEFAULT=500; . . . # HostnameList: list of hostnames managed by means of this useful resource. All contain to be # on the identical subnet. If want > 1 subnet with a RG, create as many # components as there are subnets. PROPERTY = HostnameList; EXTENSION; STRINGARRAY; TUNABLE = AT_CREATION; DESCRIPTION = "record of hostnames this resource manages"; . . . aid management API

    The aid management API (RMAPI) is a collection of low-level capabilities contained in the libscha.so library with both C and shell interfaces. the entire feature names offered 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 using the Agent Builder are built the usage of these instructions, so that you can insert further traces during this code the location the feedback point out. however, for stronger wield over the answerable judgment imposed on your utility you contain to write your application agent from scratch.

    facts carrier construction Library

    The facts service evolution Library (DSDL) is a collection of bigger-degree features encapsulated in the libdsdev.so library that builds on the RMAPI performance. This library can best exist accessed the expend of a c language interface. due to this fact, it's probably more time-consuming to keep in writing an entire application agent using this strategy, although it does present the optimum stage of performance and flexibility.

    if you used Agent Builder to create a resource type, which you could personalize it by pass of inserting added DSDL code where the feedback point out. in any other case, you must write your agent from scratch.

    the entire characteristic names offered via the library are prefixed with scds_ and are documented in allotment 3HA of the Solaris Cluster lead pages. The NFS agent source code [NFSAgent] serves as a superb example of how these APIs are used. the usage of the nfs_svc_start.c supply as a specific instance, the library is initialized with scds_initialize(). aid and useful resource neighborhood names are then retrieved the usage of scds_get_resource_name() and scds_get_resource_group_name() calls, respectively. finally, the fame of the aid is determined with the aid of the RMAPI scha_resource_setstatus() call. many of the coding distress concerned with the usage of these interfaces is consumed by means of the logic that describes how the agent should noiseless behave in a number of failure scenarios. as an instance, how many times should noiseless the agent attempt to restart the service before giving up and doubtlessly failing over? What may noiseless the agent enact according to a network failure?

    One abilities of the usage of the GDS is that the entire most appropriate practices for provider habits are already in the logic of the code that makes up the agent, saving you from re-growing that code.

    helpful Utilities for pile customized statistics services

    The Solaris Cluster utility comes with two classes that you will find very helpful in case you create your aid classification from scratch: hatimerun (see the hatimerun(1M) man web page) and pmfadm.

    hatimerun Command

    right through the start, cease, Monitor_start, and Validate methods of your resource type, you're going to deserve to race a variety of classes to function the required common sense steps. as a result of your goal is unreasonable availability, you can not quest ahead to a program that might under no circumstances respond or return, whether that program has gone into a loop or is unable to retrieve some vital data from the community, disk, or other software. due to this fact, you should locality time constraints on the duration of the program's execution. here's the characteristic of the hatimerun command. It allows for you to execute a software below its control and set a restrict on the time it might pick to respond. If the application in query fails to respond in a well timed fashion, it is terminated through default.

    The hatimerun command too makes it possible for you to leave the program running asynchronously in the background, alternate the exit code back after a timeout, or expend a selected badge to terminate your program.

    essentially the most accustomed utilization of this command is to your probe commands or in the steps main up to stopping or starting your application.

    pmfadm Command

    if you write a customized probe to your service, you construct a conclusion what constitutes a in shape carrier. The criteria could consist of utility-specific checks to determine if the statistics it's providing to potential shoppers is sound or well timed. If the utility contains discrete approaches, you could are looking to assess that each and every manner is running, the expend of the ps command. All of those exams combine to give you the most efficient assessment of your utility's present health. however, your probe is scheduled to construct its exams handiest at measure intervals. in spite of the fact that that you would exist able to tune these checks to pick location at shorter intervals, doing so outcomes in a greater load on your gadget. subsequently, you should wait, on common, half the probe term before your probe detects a condition the location your utility has completely failed, signification that the entire approaches contain exited. once once more, this does not aid a total lot toward your purpose of elevated availability.

    The solution is to expend pmfadm, the system-monitoring facility command. if you start your application beneath pmfadm, it screens All of the strategies your software spawns to a degree that you investigate. by using default, it displays All of the utility's infant tactics. in the event that they All exit, pmfadm immediately restarts your application for you on the situation that it has not already passed a preset number of restarts inside a undeniable time interval.

    probably the most established utilization of this command is to your birth command to exist sure that your key utility techniques are monitored and that comprehensive screw ups are reacted to instantly.

    libschost.so Library

    Some functions save or construct expend of configuration counsel concerning the physical hostname of the server on which the application is running. Such functions will obviously fail when the utility is placed in a resource neighborhood and moved between the nodes of a cluster. This failure occurs as a result of calls to uname or gethostbyname bear distinctive responses on the global zone of each and every cluster node. Oracle software Server and the Oracle E-enterprise Suite are two examples of courses that risk such failures [LibHost].

    to beat this hindrance, you employ the LD_PRELOAD characteristic to permit the runtime linker to interpose the libschost.so.1 library in the dynamic linking method. birthright here instance shows how this is done. that you would exist able to expend the identical construct inside your aid delivery or Monitor_start (probe) methods, as required.

    instance 4.19. the pass to expend the sclibhost.so.1 Library to trade the String returned as the Hostname

    Use the uname command to monitor the present hostname.

    # uname -n phys-winter1

    Set the LD_PRELOAD_32, LD_PRELOAD_64 and SC_LHOSTNAME ambiance 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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