Node Cookbook - Third Edition

How it works...

DNS is one of the oldest service discovery mechanisms available and has of course been around since before the Word Wide Web. DNS is primarily used for resolving hostnames (for example www.google.com ) into IP addresses. However DNS can also be used to provide other information. For service discovery we are interested in two pieces of information: the IP address and the port number that the service resides on. To find this information using DNS we need to query two types of records: SRV records and A records.

DNS record types A full list of DNS record types can be found on Wikipedia at this URL https://en.wikipedia.org/wiki/List_of_DNS_record_types.

Under the hood the concordant module firstly performs an SRV query, this returns ...