dns(5)

NAME | Description | Examples | Attributes | See Also

NAME

SUNW.dns, dns – resource type implementation for failover Domain Name Service (DNS)

Description

The DNS data service for Sun Cluster 3.2 is configured as a resource managed by the Sun Cluster Resource Group Manager (RGM). You must set the following properties on a DNS resource.

See r_properties(5) for a complete description of the following resource properties.

Standard Properties

Network_resources_used

Default

No default

Tunable

At creation

Port_list

Default

53/udp

Tunable

At creation

For DNS resources, the value of 53/udp is the only recommended value.

Retry_count

Default

2

Tunable

When disabled

Retry_interval

Default

300

Tunable

When disabled

Thorough_probe_interval

Default

60

Tunable

Any time

Extension Properties

Confdir_list

Type string array. This property is the path name to the configuration directory that contains the file named.conf of the DNS resource. You must specify only one value for this property at resource creation time.

DNS_mode

Type string array. This property is the configuration file to be used for starting DNS. The default is conf, which means that the DNS is started by using the named.conf file located in the directory pointed to by the value of the Confdir_list property. A value of boot means that DNS is started with the named.boot file as the configuration file. You can specify the value of this property at resource creation time only.

Monitor_retry_count

Type integer. Default is 4. This property controls the restarts of the fault monitor. It indicates the number of times the fault monitor is restarted by the process monitor facility and corresponds to the -n option passed to the pmfadm(1M) command. The number of restarts is counted in a specified time window (see the property Monitor_retry_interval). Note that this property refers to the restarts of the fault monitor itself, not DNS. The restarts of DNS are controlled by the system-defined properties Thorough_Probe_Interval and Retry_IntervalandRetry_Count, as specified in the description of those system-defined properties. See clresource(1CL). You can modify the value for this property any time.

Monitor_retry_interval

Type integer. Default is 2. Indicates the time (in minutes) over which the failures of the fault monitor are counted and corresponds to the -t option passed to the pmfadm(1M) command. If the number of times the fault monitor fails exceeds the extension property Monitor_retry_count, the fault monitor is not restarted by the Process Monitor Facility. You can modify the value for this property any time.

Probe_timeout

Type integer. Default is 120. Indicates the time-out value (in seconds) used by the fault monitor to probe a DNS instance. You can modify the value for this property any time.

Examples

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Example 1 Initiating a Failover DNS Resource




For this example to work, you must first install the data service. This example instantiates a failover DNS resource named dnss in a resource group named dns-rg. dns-rg is assumed to contain at least one LogicalHostname resource, which identifies the logical hostnames associated with the resource group.

example# clresourcetype register SUNW.dns example# clresource create -g dns-rg –t SUNW.dns \ -p Confdir_list=/global/dns dnss

In this example, the DNS resource created is named dnss, which listens on port 53, with a corresponding configuration directory path name /global/dns. The configuration file that is used for starting the DNS resource is named.conf, located under /global/dns.

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Example 2 Instantiating a Failover DNS Resource




For this example to work, the data service must first be installed. This example instantiates a failover DNS resource named dns in a resource group named dns-rg, which uses the LogicalHostname resource lh-specific.

example# clresourcetype register SUNW.dns example# clresource create –g dns-rg –t SUNW.dns \ -p Confdir_list=/global/dns \ -p Network_resources_used=lh-specific dns-lh

In this example, the LogicalHostname resource lh-specific must be a resource in the dns-rg resource group.

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Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Availability	SUNWscdns

See Also

in.named(1M), pmfadm(1M), scha_resource_get(3HA), clresourcetype(1CL), clresourcegroup(1CL), named.conf(4), attributes(5), r_properties(5)

Sun Cluster Data Services for DNS Guide for Solaris OS

NAME | Description | Examples | Attributes | See Also