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SRV Records

What are SRV (Service) Records?

An SRV record is intended to provide information on available services for systems, most commonly used with SIP configurations. SRV records have a unique system for naming: an underscore followed by the name of the service, followed by a period, an underscore, then the protocol, another dot, and then the name of the domain (automatically appended to the name field of the record).

An example would be: _http._tcp.example.com.
This would be the service record for web requests for the example.com domain.

SRV Record Fields

Field Description

A) Name SRV records have a unique system for naming. The naming system is an underscore followed by the name of the service, followed by a period, an underscore, then the protocol, another dot, and then the name of the domain (automatically appended to the name field of the record). An example would be: _http._tcp.example.com. would be the service record for web requests for the example.com domain.

B) TTL The TTL (Time to Live) in seconds is the length of time the record will cache in resolving name servers and web browsers. The longer the TTL, then remote systems will lookup the DNS record less frequently. Your nameservers will also receive less query traffic since most queries are answered by resolving name servers. Conversely, the shorter the TTL the faster any changes you make to your DNS will propagate in servers that have cached data. However, your domain will receive more query traffic.

Recommended values:

Records that are static and don’t change often should have TTL’s set between 1800 (being on the low end) to 86400 seconds (30 minutes to 1-day cache).

Records configured with Failover or that change often should have TTL’s set anywhere from 180 to 600 (3 to 10 minutes cache).

If a change is needed for a record with a high TTL, then the TTL can be lowered prior to making the change and then raised back up again after the changes were made.


C) Priority The priority functions in the same way as the MX Level does in MX Records. The lower the number in the priority field, the higher the preference of the associated target. 0 is the highest priority (lowest number).

D) Weight The weight of the record allows an administrator to distribute load to multiple targets (load balance). It is used to determine relative capacity and load between two SRV fields within the same priority, hits will be assigned proportionately by weight. This can also allow the administrators to have a powerful and weak server and share the appropriate loads between those systems. 0 is the lowest load.

E) Port The port of the service offered.

F) Host The system that will receive the service.

G) Notes Add a helpful note with keywords so you can search for your records later.

H) Save Save your record changes and don’t forget to commit your changes after you’re done making record changes for this domain!


SRV record


Video Tutorial: How to Add, Edit, and Delete Records

ADD A SRV RECORD

1.Select Managed DNS and click on Domains
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2. Select the Domain Name you want to add a SRV record to.
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3. Under the SRV Records section, click the plus_icon to add a record.
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4. Enter a name for the record and edit the default TTL if needed. SRV records have a unique system for naming: an underscore followed by the name of the service, followed by a period, an underscore, then the protocol, another dot, and then the name of the domain (automatically appended to the name field of the record). For example: _http._tcp.example.com. The notes section lets you add a helpful note about this record if you wish. Click Save and Close.

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Information on the NX Domain feature can be found in the Disabling a Record tutorial.

EDIT A SRV RECORD

1. Select Managed DNS and click on Domains
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2. Select the Domain Name you want to edit
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3. Under the SRV Records section, select a record by clicking the check mark next to it, then click the edit_icon icon to edit a record.
edit srv
Please note, you can not edit a record that has not been committed following its creation.

4. Edit any of the record data you wish to change. Click Save and Close.
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DELETE A SRV RECORD

1. Select Managed DNS and click on Domains
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2. Select the Domain Name you want to delete records from.
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3. Under the SRV Records section select a record by clicking the check mark next to it, click the delete_icon icon to delete a record.
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Please note, you can not delete a record that has not been committed following its creation.

4. The record will now show as strike through text, and is now in the queue of changes to be committed.
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5. If this was a mistake, you can click the undo_icon icon to undo the deleted record.
undo delete srv