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As described in the part "statistics service and software agents" in Chapter 2, "Oracle Solaris Cluster: points and structure," Oracle has a considerable listing of supported agents that cowl many of the functions on your records middle. These software brokers are maintained by means of Oracle and are significantly proven on each and every new liberate of each the Solaris Cluster utility and the utility itself. in spite of this, inevitably you can have an application that is not a part of the current agent portfolio.software Suitability
before creating a aid type for your application, you must verify no matter if the application meets the standards for being made extremely obtainable. the following record highlights the main features you have to believe. For an entire list see "examining the utility for Suitability" in [SCDevGuide].
after you have decided that your application is suitable for being made extremely attainable, you have a few the right way to obtain the indispensable integration:
every choice is mentioned in additional element in the following sections.well-known facts provider
The prevalent information service (GDS) is provided with the Solaris Cluster software. The SUNW.gds agent is packaged in the SUNWscgds equipment, which is put in as regular with the aid of the Solaris Cluster software installer software. The SUNW.gds agent is considered the preferred way to create both failover and scalable substances. The GDS is supported with the aid of Oracle, however you need to guide the script that you deliver for the Start_command, Stop_command, Probe_command, and Validate_command strategies.
by way of default, the SUNW.gds useful resource category is not registered, so that you need to register it earlier than attempting to create a useful resource of that class. The commands in right here instance demonstrate the way to examine if the resource category is registered and then a way to register it, if it is no longer already present.illustration 4.13. Registering the SUNW.gds aid class
Use the clresourcetype command to investigate no matter if the SUNW.gds useful resource type has to be registered.# clresourcetype list | grep SUNW.gds # clresourcetype register SUNW.gds # clresourcetype record | grep SUNW.gds SUNW.gds:6
moreover the commonplace resource residences, the GDS agent has four properties to allow you to combine your application: Start_command, Stop_command, Probe_command, and Validate_command. These homes are described in "Integrating Your utility-certain logic." by using the GDS because the groundwork for your application, you automatically advantage from all the patches and have improvements that the GDS receives.
illustration 4.14 suggests the way to use the GDS to make the X11 program xeyes enormously obtainable. You start by using making a Start_command software. during this example, a script calls the total direction identify of the software with a parameter that is passed to the shell script. This script have to exist on all of the cluster nodes on which the application is supposed to run.
subsequent, having checked that the SUNW.gds resource class is registered, you create the resource neighborhood. during this example, you permit the useful resource neighborhood's node checklist to default to all the cluster nodes.
subsequent, you create a resource to symbolize your software. within the instance, the Start_command property is detailed by the script you wrote (and which must exist on all nodes). The reveal parameter to use is additionally precise. as a result of this program doesn't hear on any community ports, you put the network_aware property to false. This capacity that the probe mechanism used will be the endured existence of the xeyes manner that the Start_command application leaves operating within the history. by using default, any resource you create is enabled in order that when the useful resource neighborhood is brought on-line, the resource is automatically begun. To exchange the default, you could specify the -d argument to the clresource create command.
The closing two steps coach the RGM that it must manage or control the xeyes-rg resource group after which to deliver that resource neighborhood online. The action of bringing the useful resource neighborhood online starts the aid because it was created in an enabled state.
Assuming you have allowed far flung X11 consumers to screen for your X server the use of xhost and you have detailed the relevant X screen to use (exchange a worth proper to your atmosphere for myhost:1.0), then the xeyes software will seem on your reveal. that you can change the aid community between nodes and the RGM will kill the xeyes method and restart it on the brand new node, phys-summer2, because the example suggests.example 4.14. developing a simple, enormously accessible xeyes carrier
record the script that might be used to start the xeyes command.# cat /tmp/start_xeyes #!/bin/ksh /usr/openwin/demo/xeyes -screen $1 & exit 0
investigate that the SUNW.gds resource category is registered, and then create the aid neighborhood and aid in order to handle the xeyes service.# clresourcetype listing | 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 community on-line.# clresourcegroup manage xeyes-rg # clresourcegroup on-line xeyes-rg # clresourcegroup popularity xeyes-rg === Cluster useful resource companies === community identify Node name Suspended status ---------- --------- --------- ------ xeyes-rg phys-summer1 No online phys-summer2 No Offline # clresourcegroup switch -n phys-summer2 xeyes-rg # clresourcegroup popularity xeyes-rg === Cluster aid companies === group identify Node identify Suspended popularity ---------- --------- --------- ------ xeyes-rg phys-summer1 No Offline phys-summer2 No online
To reveal how the GDS handles application failure, quit the xeyes program from your X display. you'll notice that the RGM restarts the software pretty much immediately. The messages in /var/adm/messages (see illustration four.15) point out that the RGM recognized the failure and restarted the provider.
After the fault probe determines that the service is online, indicated with the aid of carrier is on-line in /var/adm/messages, kill the technique again. The aid has two homes that check how repeatedly it's restarted through the RGM inside a undeniable time length. These houses are Retry_count and Retry_interval (see example four.sixteen). After the unique number of screw ups, the built-in good judgment of the GDS determines that the present node is unhealthy and releases the carrier so that it can also be started on a further node. If the carrier also experiences problems on this node, then the RGM will not fail the carrier lower back to its fashioned node until the time duration, in seconds, as described by the useful resource group's Pingpong_interval property, has handed. as a substitute, the GDS attempts to retain the carrier operating on the closing node. This conduct is governed via an extra property called Failover_mode.
The aim of the Pingpong_interval property is to prevent a provider that fails to birth from endlessly looping, resulting in the carrier migrating from side to side between cluster nodes. In a verify ambiance, you may need to reset the price of Pingpong_interval to a reduce cost. Doing so allows you to restart your provider after you have corrected any issues you encountered.example four.15. pattern RGM Messages
The /var/adm/messages file consists of advice on the state changes of the resource groups and supplies in the cluster.Nov 23 04:00:23 phys-summer2 Cluster.RGM.global.rgmd: [ID 529407 daemon.notice] aid group 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 status msg on node phys-summer2 alternate to <provider is on-line.> Nov 23 04:01:25 phys-summer2 Cluster.PMF.pmfd: [ID 887656 daemon.notice] method: tag="xeyes-rg,xeyes-rs,0.svc", cmd="/bin/sh -c /tmp/start_xeyes myhost:1.0", Failed to reside up. Nov 23 04:01:25 phys-summer2 Cluster.RGM.world.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] useful resource xeyes-rs repute msg on node phys-summer2 alternate to <service daemon no longer running.> Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 423137 daemon.error] A useful resource restart attempt on aid xeyes-rs in aid neighborhood 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.international.rgmd: [ID 494478 daemon.notice] aid xeyes-rs in useful resource group xeyes-rg has requested failover of the aid community on phys-summer2. Nov 23 04:01:25 phys-summer2 Cluster.RGM.world.rgmd: [ID 423291 daemon.error] RGM is never failing useful resource group <xeyes-rg> off of node <phys-summer2>, because there are no different present or abilities masters Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 702911 daemon.error] aid <xeyes-rs> of aid group <xeyes-rg> failed pingpong verify on node <phys- summer1>. The resource neighborhood are not 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 effort 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 aid restart request because the utility exited. illustration 4.sixteen. Retry, Failover Mode, and Ping-pong Interval residences
Use the clresource command to verify the property values of the xeyes-rs resource.# clresource demonstrate > -p retry_count,retry_interval,failover_mode xeyes-rs === elements === resource: xeyes-rs --- general and extension properties --- Retry_interval: 370 category: general Description: Time through which video display makes an attempt to restart a failed aid Retry_count instances. category: int Retry_count: 2 category: common Description: indicates the variety of times a monitor restarts the resource if it fails. classification: int Failover_mode: soft category: normal Description: Modifies restoration movements taken when the useful resource fails. class: enum # clresourcegroup display -p pingpong_interval xeyes-rg === aid groups and resources === resource group: xeyes-rg Pingpong_interval: 3600
in the previous example, the display variable property will also be changed only by using stopping the useful resource and editing the Start_command property. although of little significance here, because the xeyes software ought to be restarted to trade the goal X server on which it displays, it does make a change in situations the place a variable can also be changed while a provider is working. Examples include changing debugging stages to make use of and changing directories for log files.
To create a aid class that has new extension homes that will also be modified if you happen to need to alternate them, you deserve to both write your resource category from scratch or create a subclass of the GDS, as described in a later part.assisting New applications the use of the advanced Agent Toolkit
Many utility brokers within the existing Solaris Cluster software free up are derived from the superior Agent Toolkit methodology [AdvGDSTlkit]: HA-PostgreSQL, HA-MySQL, and HA containers, to identify three. All three use the SUNW.gds agent as their basis. although, in its raw form, the SUNW.gds agent has some barriers.
The cause in the back of the toolkit is that every one new software brokers have many usual requirements:
The toolkit additionally simplifies much of the work essential to handle Oracle Solaris Zones and SMF. as a consequence, providing this prolonged framework permits your developers to focus on the utility-particular integration work in place of on debugging the framework itself. After the work is comprehensive, the brand new useful resource category is registered the use of a registration script.constructing useful resource types through creating a Subclass of the GDS
The talents of creating a subclass of the GDS, rather than writing a brand new useful resource type from scratch, is that the new aid category inherits all the premiere practices that are already a part of the general GDS code. additionally, making a subclass of the GDS makes it possible for you to create your personal aid classification extension houses while keeping the same degree of flexibility as if you had begun from scratch. finally, your new resource type, which is a subclass of the GDS, has a definite name, enabling you to without problems distinguish components of the brand new useful resource category. if you as an alternative used the superior Agent Toolkit or the SUNW.gds agent, then you definitely would need to examine what the useful resource is through analyzing the extension properties or reviewing the code. This step can be imperative since the useful resource type would be set to SUNW.gds, instead of MYCORP.appsvr, for example.
You create a subclass of the GDS via creating a resource type registration (RTR) file where the RT_basedir parameter is determined to the listing containing binaries used through the common GDS strategies: birth, cease, Validate, and so forth. then you prolong the RTR file through defining your personal useful resource type extension properties. at last, you put the method parameters in the RTR file to point to your scripts that override the average GDS conduct.
several present solar useful resource types are applied this fashion, including the HA-Logical area agent (SUNW.ldom), which turned into lined within the part "Failover visitor Domains" in Chapter three, "Combining Virtualization technologies with Oracle Solaris Cluster application."
The RTR file for the SUNW.ldom useful resource class is proven in example four.17. during this RTR file, the RT_basedir parameter is determined to the commonplace listing for the GDS kit, that's, /opt/SUNWscgds/bin. Of the common methods, handiest Init, Boot, and Validate were overridden the usage of programs that are located within the ../../SUNWscxvm/bin directory. unlike a common GDS aid type, the Start_command, Stop_command, Probe_command, and Validate_command houses are assigned mounted values and can't be modified. here is indicated by way of the Tunable = NONE settings. moreover, every command, other than validate_command, is referred to as with a consistent set of arguments, particularly, -R %RS_NAME -T %RT_NAME -G %RG_NAME. The %variable assemble is comparable to the $variable syntax found in shell scripts. It ability that when a useful resource of this classification is instantiated, use the names you assigned it as arguments. as an example, if you wrote a resource classification known as FOO.bar after which created a resource community referred to as whizz-rg containing a useful resource known as bang-rs of this type, the argument passed would be -R bang-rs -T FOO.bar -G whizz-rg. With these arguments, you can then make calls to the RMAPI or DSDL APIs to retrieve or set homes.
In distinction to the Start_command, Stop_command, and Probe_command homes, the Validate_command property doesn't use this construct. as an alternative, the RGM passes the validate command all the properties listed for the useful resource class on the command line. Then the validate command parses this listing and determines whether the configuration is valid.example four.17. RTR File for the SUNW.ldom useful resource type
here text shows one of the key elements of the RTR file for the SUNW.ldom resource class:. . . 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; delivery = 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 useful resource property declarations # that come after the useful resource-type declarations # The property-identify declaration ought to be the first attribute # after the open curly of a paramtable entry # # the following are the device defined homes. every of the device defined # houses have a default price set for each and every of the attributes. analyze # man rt_reg(four) for an in depth clarification. # PROPERTY = Start_timeout; MIN = 60; DEFAULT = 300; PROPERTY = Stop_timeout; MIN = 60; DEFAULT = 300; . . . # here is an not obligatory property. Any price provided can be used as # absolutely the direction to a command to invoke to validate the software. # If no value is provided, The validation should be skipped. # PROPERTY = Validate_command; EXTENSION; STRING; DEFAULT = ""; TUNABLE = NONE; DESCRIPTION = "Command to validate the application"; # This property have to be distinctive, considering that this is the simplest mechanism # that indicates how to birth the software. on account that a value have to # be offered, there is not any default. The value have to be an absolute direction. PROPERTY = Start_command; EXTENSION; STRINGARRAY; DEFAULT = "/choose/SUNWscxvm/bin/control_xvm start -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to start utility"; # here is an non-compulsory property. Any value supplied can be used as # the absolute direction to a command to invoke to stop the application. # If no cost is equipped, signals can be used to stop the application. # # It is believed that Stop_command will no longer return except the # utility has been stopped. PROPERTY = Stop_command; EXTENSION; STRING; DEFAULT = "/choose/SUNWscxvm/bin/control_xvm stop -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to stop software"; # this is an not obligatory property. Any value offered should be used as # the absolute direction to a command to invoke to probe the application. # If no price is provided, the "simple_probe" could be used to probe # the application. # 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"; # this is an not obligatory property. It determines whether the utility # uses network to speak with its purchasers. # PROPERTY = Network_aware; EXTENSION; BOOLEAN; DEFAULT = FALSE; TUNABLE = AT_CREATION; DESCRIPTION = "Determines even if the software uses network"; # here is an non-compulsory property, which determines the signal sent to the # software for being stopped. # PROPERTY = Stop_signal; EXTENSION; INT; MIN = 1; MAX = 37; DEFAULT = 15; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The sign despatched to the application for being stopped"; # here is an optional property, which determines even if to failover when # retry_count is exceeded right through retry_interval. # PROPERTY = Failover_enabled; EXTENSION; BOOLEAN; DEFAULT = genuine; TUNABLE = WHEN_DISABLED; DESCRIPTION = "Determines even if to failover when retry_count is passed all through retry_interval"; # here is an not obligatory property that specifies the log level GDS events. # PROPERTY = Log_level; EXTENSION; ENUM NONE, information, ERR ; DEFAULT = "info"; TUNABLE = every time; DESCRIPTION = "Determines the log stage for adventure based mostly traces"; Property = Debug_level; Extension; Per_node; Int; Min = 0; Max = 2; Default = 0; Tunable = anytime; Description = "Debug stage"; Property = Domain_name; Extension; String; Minlength = 1; Tunable = WHEN_DISABLED; Description = "LDoms visitor area name"; Property = Migration_type; Extension; Enum regular, MIGRATE ; Default = "MIGRATE"; Tunable = every time; Description = "category of visitor area migration to be performed"; PROPERTY = Plugin_probe; EXTENSION; STRING; DEFAULT = ""; TUNABLE = anytime; DESCRIPTION = "Script or command to determine the guest domain"; PROPERTY = Password_file; EXTENSION; STRING; DEFAULT = ""; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The complete course to the file containing the target host password"; scdsbuilder GUI
To personalize an agent beyond what is accepted through the GDS, that you could use the Agent Builder command, scdsbuilder (see the scdsbuilder(1HA) man page). This command has three code generation alternate options, and the ensuing data are wrapped in a Solaris package so you might install for your cluster nodes:
which you could customize the resulting code to your particular needs. despite the fact, with the ksh registration script for the GDS agent, the scope for modification is restricted. The illustration in determine four.7 suggests using the third alternative.
determine 4.7 using the scdsbuilder GUI to create a new resource classification
The scdsbuilder command begins the Solaris Cluster Agent Builder GUI, as proven in figure 4.7. in this instance, facts has already been exact for each field purchasable to the person. a brief code of SUNW is targeted for the provider identify, and tstgds is distinctive for the application identify. This records is then used to generate each the identify of the equipment that Agent Builder creates for you and the name of the useful resource type that you'll subsequently use.
The suggestions you deliver within the different fields is used as follows:
after you have entered the statistics and clicked on the subsequent button, you're offered with the display shown in figure 4.8.
figure four.eight completing the aid type definition using scdsbuilderIntegrating Your application-selected common sense
you use the fields during this 2d display to provide the location of the classes (which may also be compiled executables or scripts) and their associated arguments that will be used to beginning, cease, probe, and validate your facts carrier when it's installed on the target cluster nodes. For each and every program, you can set a closing date on how lengthy it might take for the program to finished. If the program doesn't complete inside the allocated time duration, then the aid is placed right into a failed state, similar to STOP_FAILED.
you're required to provide a worth most effective for the birth software. all the different courses are not obligatory. Any programs precise ought to exit with a return code of zero simplest when they've successfully achieved their work. in the event that they fail to function their allotted assignment, they ought to return a value enhanced than a hundred. Values below that are used with the aid of the Solaris Cluster instructions and have specific meanings (see the intro(1CL) man web page).
The classes you assign to the beginning and prevent instructions need to return effectively handiest when your target application has in reality accomplished the valuable operation. If the cease command leaves the application below its control running, or no longer absolutely stopped, but the stop command returns correctly, then the cluster framework erroneously determines that it is secure to beginning the resource community on an additional cluster node. In some situations, specially when the software uses a worldwide file equipment, this outcomes might influence in records corruption because the two instances of the software could write to their statistics information in an uncontrolled fashion.
If no stop command is supplied, the method tree that results from the birth command is terminated the use of the kill command.
The validate command allows for you to assess that your application is as it should be configured on the entire talents nodes on which it could actually run. once again, if the software determines that your software is misconfigured, the validate application have to exit with a nonzero exit code.
The capability to include a probe command is without doubt one of the key advantages of the use of the Solaris Cluster framework. A probe command allows you to write down a program that determines the health of your utility. for example, if you're writing a probe for a database, you may examine whether it can execute basic SQL statements, akin to creating or deleting a table, or adding or deleting a checklist. in case you do not supply a probe script, then default strategies are used in its place.
For non-community-conscious functions, the system-monitoring command pmfadm (see the pmfadm(1M) man page) displays the technique tree spawned through your start command. simplest if all the approaches have failed will the cluster framework attempt to restart the provider. hence, in case your service includes multiple techniques and only 1 process fails, then pmfadm will not appreciate this fault unless it explanations the entire different approaches to fail as neatly. as a result, if you deserve to computer screen your software with a stronger diploma of granularity, you must deliver a customized fault probe.
If the software is community-aware, then the default probe tries to open the port listed within the port_list property. as a result of here is an easy probe, it makes no try and retrieve any records. however the default probe efficiently opens the ports, that doesn't always point out standard software fitness.
in the previous illustration, you can set up the package generated by scdsbuilder on all of your cluster nodes. you could possibly then register the new aid class in order that you might create new elements of this type. When the RGM is requested to create a aid, it calls the validate command: /usr/native/bin/my_validate -o some_param. If that command succeeds and also you permit the aid, the RGM calls the /usr/native/bin/my_start -r foo-rs -g bar-rg command. In each situations, the initial arguments are fastened, but that you may regulate them as a result using the clresource command.resource classification Registration File
if you decide to jot down an agent from scratch using either the RMAPI or DSDL APIs, you ought to first describe the homes of your proposed aid classification in a file common as the resource category registration (RTR) file. This file provides the RGM with details on which courses to call and which variables are required to control the certain software.
example four.18 suggests an extract from the SUNW.LogicalHostname RTR file. as the instance suggests, all the programs for this resource type can be found in the listing described with the aid of RT_BASEDIR. The RTR file also defines classes a good way to, among other projects, delivery, cease, and probe (Monitor_start) the logical IP handle that the resource plumbs. These addresses are, in flip, described within the HostnameList property.
The extension homes you define are all utility-certain. They may, for example, seek advice from the region of the application binaries, that is, the application domestic listing. If a property has a default value, then you can define it in the RTR file to store your device administrator from having to override it each and every time she or he creates a aid of this type. furthermore, you could region limits on what values certain properties can take and once they may also be changed.instance four.18. Extract from the SUNW.LogicalHostname RTR File
right here textual content shows one of the vital key constituents of the RTR file for the SUNW.LogicalHostname aid category:# # Copyright 1998-2008 sun Microsystems, Inc. All rights reserved. # Use is discipline to license phrases. # #ident "@(#)SUNW.LogicalHostname 1.20 08/05/20 SMI" # Registration suggestions and Paramtable for HA Failover IPaddress # # observe: key phrases are case insensitive, i.e. clients may also use any # capitalization style they wish # RESOURCE_TYPE ="LogicalHostname"; VENDOR_ID = SUNW; RT_DESCRIPTION = "Logical Hostname aid class"; SYSDEFINED_TYPE = LOGICAL_HOSTNAME; RT_VERSION ="3"; API_VERSION = 2; INIT_NODES = RG_PRIMARIES; RT_BASEDIR=/usr/cluster/lib/rgm/rt/hafoip; FAILOVER = authentic; # To enable Global_zone_override GLOBAL_ZONE = authentic; 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" anytime # The paramtable is an inventory of bracketed aid property declarations # that come after the useful resource-class declarations # The property-name declaration must be the first attribute # after the open curly of a paramtable entry # # The Paramtable can not contain TIMEOUT homes for methods # that aren't within the RT PROPERTY = Start_timeout; MIN=360; DEFAULT=500; . . . # HostnameList: checklist of hostnames managed by using this aid. All ought to be # on the identical subnet. If want > 1 subnet with a RG, create as many # supplies as there are subnets. PROPERTY = HostnameList; EXTENSION; STRINGARRAY; TUNABLE = AT_CREATION; DESCRIPTION = "list of hostnames this aid manages"; . . . resource administration API
The useful resource management API (RMAPI) is a set of low-degree functions contained in the libscha.so library with each C and shell interfaces. all of the feature names provided by means of this interface are prefixed with scha_. The shell interfaces are listed in part 1HA of the Solaris Cluster guide pages.
The ksh scripts generated by the Agent Builder are developed the use of these instructions, so you can insert extra strains in this code the place the comments indicate. although, for improved manage over the common sense imposed for your utility you ought to write your software agent from scratch.facts carrier building Library
The statistics provider development Library (DSDL) is a group of bigger-degree functions encapsulated within the libdsdev.so library that builds on the RMAPI functionality. This library can handiest be accessed the usage of a c programming language interface. because of this, it is doubtlessly extra time-consuming to write down a complete application agent the usage of this approach, even though it does present the foremost degree of efficiency and suppleness.
if you used Agent Builder to create a resource classification, which you could customize it via inserting additional DSDL code the place the comments indicate. in any other case, you need to write your agent from scratch.
all of the feature names supplied by means of the library are prefixed with scds_ and are documented in part 3HA of the Solaris Cluster manual pages. The NFS agent supply code [NFSAgent] serves as a good example of how these APIs are used. using the nfs_svc_start.c source as a selected illustration, the library is initialized with scds_initialize(). useful resource and useful resource group names are then retrieved the use of scds_get_resource_name() and scds_get_resource_group_name() calls, respectively. eventually, the popularity of the resource is determined through the RMAPI scha_resource_setstatus() call. most of the coding effort panic with using these interfaces is consumed via the common sense that describes how the agent should behave in a number of failure scenarios. as an example, how repeatedly should the agent try and restart the provider before giving up and doubtlessly failing over? What should the agent do based on a network failure?
One abilities of using the GDS is that all of the most excellent practices for provider conduct are already within the logic of the code that makes up the agent, saving you from re-developing that code.beneficial Utilities for constructing custom records services
The Solaris Cluster utility comes with two classes that you'll find very useful in case you create your useful resource class from scratch: hatimerun (see the hatimerun(1M) man web page) and pmfadm.hatimerun Command
all over the birth, stop, Monitor_start, and Validate strategies of your aid category, you will need to run quite a few classes to operate the necessary common sense steps. as a result of your goal is excessive availability, you can't stay up for a application that could on no account respond or return, even if that program has gone into a loop or is unable to retrieve some crucial data from the network, disk, or different program. due to this fact, you must vicinity time constraints on the duration of the software's execution. here's the characteristic of the hatimerun command. It permits you to execute a software below its manage and set a limit on the time it may take to respond. If the software in query fails to respond in a timely vogue, it is terminated with the aid of default.
The hatimerun command additionally enables you to leave the software operating asynchronously within the background, alternate the exit code back after a timeout, or use a specific sign to terminate your program.
probably the most ordinary utilization of this command is to your probe instructions or in the steps leading as much as stopping or starting your application.pmfadm Command
in case you write a customized probe for your service, you decide what constitutes a suit service. The standards could include application-selected assessments to determine if the information it's supplying to advantage shoppers is legitimate or well timed. If the software carries distinct processes, you could want to check that each and every system is running, using the ps command. All of those tests mix to deliver you the choicest evaluation of your software's latest fitness. despite the fact, your probe is scheduled to make its checks best at usual intervals. notwithstanding that you would be able to tune these assessments to ensue at shorter intervals, doing so outcomes in a enhanced load for your system. subsequently, you ought to wait, on common, half the probe period earlier than your probe detects a situation where your utility has absolutely failed, which means that all the processes have exited. as soon as once more, this doesn't aid lots towards your aim of high availability.
The answer is to use pmfadm, the manner-monitoring facility command. in case you start your software below pmfadm, it monitors all of the approaches your application spawns to a stage that you just check. through default, it displays all the utility's infant tactics. in the event that they all exit, pmfadm instantly restarts your software for you on the condition that it has no longer already passed a preset variety of restarts within a certain time interval.
essentially the most standard utilization of this command is on your beginning command to be sure that your key utility methods are monitored and that comprehensive disasters are reacted to automatically.libschost.so Library
Some purposes store or make use of configuration counsel in regards to the genuine hostname of the server on which the utility is working. Such applications will most likely fail when the application is placed in a aid group and moved between the nodes of a cluster. This failure occurs as a result of calls to uname or gethostbyname produce distinctive responses on the world zone of every cluster node. Oracle application Server and the Oracle E-business Suite are two examples of classes that risk such failures [LibHost].
to beat this limitation, you use the LD_PRELOAD feature to allow the runtime linker to interpose the libschost.so.1 library within the dynamic linking system. the following instance indicates how here's performed. that you can use the same assemble inside your useful resource beginning or Monitor_start (probe) strategies, as required.instance four.19. a way to Use the sclibhost.so.1 Library to alternate the String again as the Hostname
Use the uname command to screen the latest 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/sixty four/libschost.so.1 # SC_LHOSTNAME=myhost # export SC_LHOSTNAME LD_PRELOAD_32 LD_PRELOAD_64 # uname -n myhost
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