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Oracle Solaris Cluster Data Services Developer's Guide     Oracle Solaris Cluster 4.0
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Document Information


1.  Overview of Resource Management

2.  Developing a Data Service

3.  Resource Management API Reference

4.  Modifying a Resource Type

5.  Sample Data Service

Overview of the Sample Data Service

Defining the Resource Type Registration File

Overview of the RTR File

Resource Type Properties in the Sample RTR File

Resource Properties in the Sample RTR File

System-Defined Properties in the RTR File

Extension Properties in the RTR File

Providing Common Functionality to All Methods

Identifying the Command Interpreter and Exporting the Path

Declaring the PMF_TAG and SYSLOG_TAG Variables

Parsing the Function Arguments

Generating Error Messages

Obtaining Property Information

Controlling the Data Service

How the Start Method Works

What the Start Method Does

Verifying the Configuration

Starting the Application

Start Exit Status

How the Stop Method Works

What the Stop Method Does

Stopping the Application

Stop Exit Status

Defining a Fault Monitor

How the Probe Program Works

What the Probe Program Does

Obtaining Property Values

Checking the Reliability of the Service

Comparing Restart With Failover

Restarting the Data Service

Probe Exit Status

How the Monitor_start Method Works

What the Monitor_start Method Does

Starting the Probe

How the Monitor_stop Method Works

What the Monitor_stop Method Does

Stopping the Monitor

Monitor_stop Exit Status

How the Monitor_check Method Works

Handling Property Updates

How the Validate Method Works

What the Validate Method Does

Validate Method Parsing Function

Validating Confdir

Validate Exit Status

How the Update Method Works

What the Update Method Does

Stopping the Monitor With Update

Restarting the Monitor

Update Exit Status

6.  Data Service Development Library

7.  Designing Resource Types

8.  Sample DSDL Resource Type Implementation

9.  Oracle Solaris Cluster Agent Builder

10.  Generic Data Service

11.  DSDL API Functions

12.  Cluster Reconfiguration Notification Protocol

A.  Sample Data Service Code Listings

B.  DSDL Sample Resource Type Code Listings

C.  Requirements for Non-Cluster-Aware Applications

D.  Document Type Definitions for the CRNP

E. Application


Overview of the Sample Data Service

The sample data service starts, stops, restarts, and switches the DNS application among the nodes of the cluster in response to cluster events, such as administrative action, application failure, or node failure.

Application restart is managed by the Process Monitor Facility (PMF). If the number of applications that die exceeds the failure count within the failure time window, the fault monitor fails over the resource group that contains the application resource to another node.

The sample data service provides fault monitoring in the form of a PROBE method that uses the nslookup command to ensure that the application is healthy. If the probe detects a hung DNS service, the probe tries to correct the situation by restarting the DNS application locally. If restarting the DNS application locally does not improve the situation and the probe repeatedly detects problems with the service, the probe attempts to fail over the service to another node in the cluster.

Specifically, the sample data service includes the following elements: