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Service location (SRV) records in DNS offer
flexibility for networks that contain multiple servers for a
particular service. One example of when SRV records come in handy
is when you have multiple HTTP servers.
SRV records let you easily move a service from
one host to another. Using SRV records, you can also designate
specific hosts as the primary host for a given service and others
as the secondary host.
Resolvers that support SRV records submit a
request to the DNS server in the subject domain, requesting a
specific TCP/IP service, such as HTTP. The DNS server responds with
a list of all servers in the domain that have a corresponding SRV
record for the specified service. The client can then choose a host
based on that list.
To create an SRV record, follow these
- Open the DNS console on the server,
right-click the location for the new record, and choose Other New
- In the Resource Record Type dialog box,
choose Service Location, and click Create Record.
- Select the predefined service type for the
service, and choose either TCP or UDP depending on the requirements
of the service.
- For the Priority value, specify an integer
between 0 and 65535 to allocate a preference order for the target
server. A lower value gives the server a lower priority; the client
attempts connections starting with higher priority servers
- For the Weight value, specify an integer
between 0 and 65535. When multiple servers have the same priority,
the Weight value serves as a secondary priority indicator. DNS
returns hosts with a higher weight first to the client. To turn off
weighting and improve SRV query response time, use a value of