Add DNS record sets
It's important to understand the difference between DNS record sets and individual DNS records. A DNS record set (also known as a resource record set) is a collection of records in a DNS zone.
You define record sets in the Azure portal. The configuration settings depend on the record type for the set to create.
Suppose you choose to create a set of A
records (or Address record) to identify IP addresses associated with your domain. To create the A
records, you need to provide the TTL (time to live) and the IP addresses. The TTL value specifies how long each record is cached by clients.
Things to know about DNS record sets
Let's examine some characteristics of DNS record sets.
All records in a DNS record set must have the same name and the same record type.
Consider the following example where we have two records in a record set. All records have the same name,
www.contoso.com.
. All records have the same record type,A
. Each record in the set has a different value. In this case, each record provides a different IP address.www.contoso.com. 3600 IN A 134.170.185.46 www.contoso.com. 3600 IN A 134.170.188.221
A DNS record set can't contain two identical records.
A record set of type
CNAME
can contain only one record.A
CNAME
record (or Canonical name record) provides an alias of one domain name to another. This record is used to provide another name for your domain. The DNSlookup
operation tries to find your domain by retrying thelookup
with the other name specified in theCNAME
record.You can create a record set that doesn't have any records. This set is called an empty record set.
If you have an empty record set for your domain, this set doesn't appear on your Azure DNS name servers.