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Test Code : 1Z0-879
Test denomination : Oracle Solaris 10 System Administrator(R) Certified Professional Upgrade
Vendor denomination : Oracle
real questions : 612 real Questions

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

growing New resource types | 1Z0-879 real Questions and VCE drill Test

This chapter is from the ebook 

As described within the zone "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 hold 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. right here checklist highlights the main points you should harmonize with. For an entire list espy "analyzing the utility for Suitability" in [SCDevGuide].

  • Is your application crash-tolerant? this is notable because in a incredibly obtainable ambiance your application should live 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 live 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 hoist uphold issues with utility companies.
  • Can your software hasten on a multihomed equipment, it truly is, one with a number of public networks? Your utility should live in a position to tackle situations the Place IP addresses are configured and unconfigured from community adapters as services tide around the cluster. This has consequences for the style your software binds to the community.
  • Does your software exercise difficult-coded route names for the vicinity of its data? in that case, then symbolic hyperlinks may no longer live enough to create sure that the facts is saved in a location it really is arrogate with the exercise 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 hold a few the right passage to achieve the necessary integration:

  • that you would live able to exercise 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 passage 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 option does not create a new aid class, it does permit you to define one or greater extension properties. This option is additionally rather standard and gives appreciable flexibility.
  • that you could exercise the GUI scdsbuilder utensil and customise the ensuing shell script or C supply the exercise of the aid administration API (RMAPI) and the records provider structure Library (DSDL) APIs. If huge customization toil is required, this option may effect in an elevated maintenance burden.
  • that you may exercise the RMAPI or DSDL APIs without deliberate to develop your resource character from scratch. This alternative trades the structure and renovation expenses for optimal flexibility and efficiency.
  • each option is discussed in additional aspect in right 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 hold to register it earlier than attempting to create a useful resource of that type. The commands in right here sample disclose a passage to check if the useful resource character is registered and then the passage 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 live registered.

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

    besides the standard 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 sum of the patches and hold improvements that the GDS receives.

    illustration 4.14 shows tips on how to exercise the GDS to create the X11 program xeyes totally accessible. You inaugurate through making a Start_command program. in this illustration, a script calls the whole route denomination of the software with a parameter it truly is passed to the shell script. This script should exist on sum 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 sum of the cluster nodes.

    subsequent, you create a resource to characterize your program. in the illustration, the Start_command property is inevitable with the aid of the script you wrote (and which should exist on sum nodes). The array parameter to exercise is too exact. as a result of this software does not hear on any community ports, you Place the network_aware property to false. This capacity that the probe mechanism used could live 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 dispute to the clresource create command.

    The final two steps discipline the RGM that it should manipulate 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 hold allowed far off X11 valued clientele to array in your X server the usage of xhost and you hold distinctive the revise X disclose to create exercise of (exchange a cost arrogate to your atmosphere for myhost:1.0), then the xeyes software will seem on your reveal. which you can switch the resource neighborhood between nodes and the RGM will abolish the xeyes system and restart it on the new node, phys-summer2, as the sample shows.

    example 4.14. developing a simple, enormously purchasable xeyes carrier

    listing the script that may live 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 passage to manipulate 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 denomination Node identify Suspended popularity ---------- --------- --------- ------ xeyes-rg phys-summer1 No Offline phys-summer2 No online

    To exhibit how the GDS handles application failure, discontinue 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 failing probe determines that the service is online, indicated via provider is on-line in /var/adm/messages, abolish the way 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 sample 4.16). After the distinct 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 live sum 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 passage 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 even of the Pingpong_interval property is to retain 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 disclose > -p retry_count,retry_interval,failover_mode xeyes-rs === substances === aid: xeyes-rs --- natural 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 live modified only via stopping the aid and editing the Start_command property. however of slight significance right here, since the xeyes program hold to live restarted to alternate the goal X server on which it displays, it does create a change in instances the Place a variable can live modified while a carrier is running. Examples encompass changing debugging tiers to exercise and changing directories for log data.

    To create a useful resource classification that has new extension residences that can live 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 exercise 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. sum three exercise 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 hold many medium 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 toil vital to manipulate Oracle Solaris Zones and SMF. as a consequence, presenting this prolonged framework makes it workable for your developers to hub of attention on the application-particular integration toil instead of on debugging the framework itself. After the toil 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 Place of writing a brand new useful resource category from scratch, is that the new useful resource classification inherits the entire most advantageous practices which are already allotment of the usual 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 positive 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 live faultfinding since the aid classification can live 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 natural 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 set the components parameters in the RTR file to factor to your scripts that override the typical GDS habits.

    a couple of present sun aid varieties are implemented this way, together with the HA-Logical zone agent (SUNW.ldom), which become covered in the zone "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 exercise of classes that can live organize 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 live modified. here's indicated by the Tunable = notone 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 organize in shell scripts. It means that after a useful resource of this character is instantiated, exercise 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 dispute passed can live -R bang-rs -T FOO.bar -G whizz-rg. With these arguments, which you can then create 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 exercise this assemble. as a substitute, the RGM passes the validate command sum 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 further after the aid-category declarations # The property-identify announcement requisite to live the first attribute # after the open curly of a paramtable entry # # here are the gadget described homes. each of the gadget defined # properties hold a default cost set for each of the attributes. examine # man rt_reg(four) for a minute clarification. # PROPERTY = Start_timeout; MIN = 60; DEFAULT = 300; PROPERTY = Stop_timeout; MIN = 60; DEFAULT = 300; . . . # here is an optional property. Any value provided can live used as # absolutely the path to a command to invoke to validate the application. # If no cost is equipped, The validation can live skipped. # PROPERTY = Validate_command; EXTENSION; STRING; DEFAULT = ""; TUNABLE = NONE; DESCRIPTION = "Command to validate the utility"; # This property should live particular, on the grounds that this is the most efficient mechanism # that shows how to delivery the utility. seeing that a worth should # live offered, there is not any default. The cost requisite to live an absolute course. PROPERTY = Start_command; EXTENSION; STRINGARRAY; DEFAULT = "/decide/SUNWscxvm/bin/control_xvm rise -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 live used as # absolutely the path to a command to invoke to discontinue the application. # If no cost is supplied, signals could live 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 live used as # the absolute route to a command to invoke to probe the software. # If no value is equipped, the "simple_probe" can live 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 exercise of community to communicate with its purchasers. # PROPERTY = Network_aware; EXTENSION; BOOLEAN; DEFAULT = FALSE; TUNABLE = AT_CREATION; DESCRIPTION = "Determines whether the application makes exercise 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 mark 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 live 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 exercise 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 sum of the indispensable 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. right here, the code generates the acceptable clresource create command.
  • that you may customise the resulting code to your inevitable 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 exercise of the third alternative.

    Figure 4.7

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

    The scdsbuilder command starts the Solaris Cluster Agent Builder GUI, as shown in figure 4.7. in this instance, records has already been minute for every box accessible to the person. a brief code of SUNW is unique for the supplier identify, and tstgds is distinct 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 materiel 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 hasten on distinctive nodes without deliberate without corrupting any of its records information, then that you may select the scalable choice. a Good sample of such an software is an internet server. For sum 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 exercise of this aid class should hold 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 option determines no matter if the resulting code makes exercise 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 exercise the C option, you must hold a C compiler installed for your system.
  • once you hold 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 zone of the classes (which can live compiled executables or scripts) and their linked arguments that should live used to delivery, cease, probe, and validate your facts service when it's set in on the goal cluster nodes. For every application, you can set a deadline on how lengthy it could purchase for the application to finished. If the program does not comprehensive within the allocated time duration, then the aid is positioned right into a failed state, reminiscent of STOP_FAILED.

    you are required to provide a worth most efficient for the birth application. sum 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 hold selected meanings (see the intro(1CL) man page).

    The programs you allot to the start and discontinue instructions ought to return efficiently handiest when your goal software has definitely achieved the pertinent operation. If the discontinue command leaves the software under its control running, or no longer fully stopped, however the discontinue 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 way tree that consequences from the birth command is terminated the exercise of the abolish command.

    The validate command enables you to examine that your application is correctly configured on sum of the potential nodes on which it could actually run. once again, if the program determines that your application is misconfigured, the validate program hold 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 accomplish 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 sum of the procedures hold failed will the cluster framework try to restart the carrier. therefore, in case your service includes distinct strategies and only one way fails, then pmfadm will no longer admire this failing 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 failing 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 medium application health.

    within the preceding instance, you would install the kit generated by means of scdsbuilder on your whole 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 settle to write down an agent from scratch using either the RMAPI or DSDL APIs, you hold to first relate 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 denomination 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, sum 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 sum application-specific. They may, for example, consult 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 materiel 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 positive houses can purchase and after they will too live 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. sum rights reserved. # exercise is territory 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 exercise 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 further after the resource-type declarations # The property-name declaration ought to live 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. sum hold 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 Place the feedback point out. however, for stronger manipulate over the Good judgment imposed on your utility you hold to write your application agent from scratch.

    facts carrier construction Library

    The facts service development 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 live accessed the exercise of a c language interface. due to this fact, it's probably more time-consuming to set 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 passage 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 sample 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 effort concerned with the usage of these interfaces is consumed by means of the logic that describes how the agent should still behave in a number of failure scenarios. as an instance, how many times should still the agent attempt to restart the service before giving up and doubtlessly failing over? What may still the agent accomplish according to a network failure?

    One abilities of the usage of the GDS is that the entire most arrogate 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 structure 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 hasten a variety of classes to role the required common sense steps. as a result of your goal is exorbitant availability, you can not eye 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 zone 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 limit on the time it might purchase 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 workable for you to leave the program running asynchronously in the background, alternate the exit code back after a timeout, or exercise a selected mark to terminate your program.

    essentially the most usual 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 create a decision 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 telling or well timed. If the utility contains distinct approaches, you could are looking to assess that each and every manner is running, the exercise of the ps command. sum of those exams combine to give you the most efficient assessment of your utility's present health. however, your probe is scheduled to create its exams handiest at standard intervals. in spite of the fact that that you would live able to tune these checks to purchase Place at shorter intervals, doing so outcomes in a greater load on your gadget. subsequently, you should wait, on common, half the probe period before your probe detects a condition the Place your utility has completely failed, meaning that the entire approaches hold exited. once once more, this does not aid a whole lot toward your purpose of elevated availability.

    The solution is to exercise pmfadm, the system-monitoring facility command. if you start your application beneath pmfadm, it screens sum of the strategies your software spawns to a degree that you investigate. by using default, it displays sum of the utility's infant tactics. in the event that they sum 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 natural utilization of this command is to your birth command to live sure that your key utility techniques are monitored and that comprehensive screw ups are reacted to instantly.

    libschost.so Library

    Some functions reclaim or create exercise of configuration advice 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. right here instance shows how this is done. that you would live able to exercise the identical construct inside your aid delivery or Monitor_start (probe) methods, as required.

    instance 4.19. the passage to exercise 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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