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SRV Records (view source)

Revision as of 16:42, 26 December 2023

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A Service record (SRV record) is a specification of data in the Domain Name System (DNS) defining the location, i.e. the hostname and port number, of servers for specified services. It is defined in [http://tools.ietf.org/html/rfc2782 RFC 2782].
A Service record ('''SRV record''') is a specification of data in the Domain Name System ('''DNS''') defining the location (i.e. the hostname and port number) of servers for specified services. It is defined in [https://datatracker.ietf.org/doc/html/rfc2782 RFC2782].


XMPP often require SRV support by network elements.
== Default Ports ==
=== XMPP ===
 
For TCP connections ([https://datatracker.ietf.org/doc/html/rfc6120 RFC6120])
 
* Server 2 Server ('''S2S''') - 5269
* Client 2 Server ('''C2S''') - 5222 ('''START TLS''') / 5223 ('''DIRECT TLS''')


== Record format ==
== Record format ==
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* '''name''': the domain name for which this record is valid.
* '''name''': the domain name for which this record is valid.
* '''TTL''': standard DNS time to live field.
* '''TTL''': standard DNS time to live field.
* '''class''': standard DNS class field (this is always ''IN'').
* '''class''': standard DNS class field (this is always '''IN''').
* '''priority''': the priority of the target host, lower value means more preferred.
* '''priority''': the priority of the target host, lower value means more preferred.
* '''weight''': A relative weight for records with the same priority.
* '''weight''': A relative weight for records with the same priority.
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== XMPP SRV records ==
== XMPP SRV records ==
  _xmpp-client._tcp.example.net. TTL IN SRV priority weight port target
  _xmpp-client._tcp.domain.tld. TTL IN SRV priority weight port target
  _xmpp-server._tcp.example.net. TTL IN SRV priority weight port target
_xmpps-client._tcp.domain.tld. TTL IN SRV priority weight port target
  _xmpp-server._tcp.domain.tld. TTL IN SRV priority weight port target
_xmpps-server._tcp.domain.tld. TTL IN SRV priority weight port target


=== Example 1 ===
=== Example 1 ===
  _xmpp-client._tcp.example.net. 86400 IN SRV 5 0 5222 example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 5 0 5222 domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 5 0 5269 example.net.
_xmpps-client._tcp.domain.tld. 86400 IN SRV 5 0 5223 domain.tld.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 5 0 5269 domain.tld.


The XMPP domain is example.net and the server is example.net.
The XMPP domain is domain.tld and the server is domain.tld.


=== Example 2 ===
=== Example 2 ===
  _xmpp-client._tcp.example.net. 86400 IN SRV 5 0 5222 server.example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 5 0 5222 server.domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 5 0 5269 server.example.net.
_xmpps-client._tcp.domain.tld. 86400 IN SRV 5 0 5223 server.domain.tld.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 5 0 5269 server.domain.tld.


The XMPP domain is example.net and the server is server.example.net.
The XMPP domain is domain.tld and the server is server.domain.tld.


=== Example 3 ===
=== Example 3 ===
  _xmpp-client._tcp.example.net. 86400 IN SRV 5 50 5222 server1.example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 5 50 5222 server1.domain.tld.
  _xmpp-client._tcp.example.net. 86400 IN SRV 10 30 5222 server2.example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 10 30 5222 server2.domain.tld.
  _xmpp-client._tcp.example.net. 86400 IN SRV 10 10 5222 server3.example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 10 10 5222 server3.domain.tld.
  _xmpp-client._tcp.example.net. 86400 IN SRV 10 10 5222 server4.example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 10 10 5222 server4.domain.tld.
  _xmpp-client._tcp.example.net. 86400 IN SRV 15 0 5222 backup.example.net.
  _xmpp-client._tcp.domain.tld. 86400 IN SRV 15 0 5222 backup.domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 5 50 5269 server1.example.net.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 5 50 5269 server1.domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 10 30 5269 server2.example.net.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 10 30 5269 server2.domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 10 10 5269 server3.example.net.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 10 10 5269 server3.domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 10 10 5269 server4.example.net.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 10 10 5269 server4.domain.tld.
  _xmpp-server._tcp.example.net. 86400 IN SRV 15 0 5269 backup.example.net.
  _xmpp-server._tcp.domain.tld. 86400 IN SRV 15 0 5269 backup.domain.tld.
 
The XMPP domain is domain.tld and the principal server is server1.domain.tld which used 50% after server2.domain.tld 30%, server3.domain.tld 10%, server4.domain.tld 10% too, if server1 is down, server2, server3 and server4 will work, if servers 1/2/3/4 are down, backup will work.


The XMPP domain is example.net and the principal server is server1.example.net which used 50% after server2.example.net 30%, server3.example.net 10%, server4.example.net 10% too, if server1 is down, server2, server3 and server4 will work, if servers 1/2/3/4 are down, backup will work.
=== Retrieving XMPP SRV records ===
$ dig SRV _xmpp-client._tcp.domain.tld
$ dig SRV _xmpp-server._tcp.domain.tld


== Retrieving SRV records ==
== External links ==
$ dig SRV _xmpp-client._tcp.example.net
* [https://wiki.xmpp.org/web/Tech_pages/XEP-0368 XEP-0368: SRV records for XMPP over TLS]
$ dig SRV _xmpp-server._tcp.example.net
* [https://datatracker.ietf.org/doc/html/rfc2782 RFC2782: A DNS RR for specifying the location of services (DNS SRV)]
* [https://datatracker.ietf.org/doc/html/rfc6120 RFC6120: Extensible Messaging and Presence Protocol (XMPP): Core]
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