Soa updating zone files
The zone file may also contain various directives that are marked with a keyword starting with the dollar sign character. The parameters of the SOA record also specify a list of timing and expiration parameters (serial number, slave refresh period, slave retry time, slave expiration time, and the maximum time to cache the record).
The most notable is the $ORIGIN keyword, which specifies the starting point for the zone in the DNS hierarchy. Some DNS server software, such as BIND, also requires at least one additional name server record.
The field record class indicates the namespace of the record information.
The most commonly used namespace is that of the Internet, indicated by parameter IN, but others exist and are in use, e.g., CHAOS.
Azure DNS supports importing and exporting zone files by using the Azure command-line interface (CLI).
Zone file import is not currently supported via Azure Power Shell or the Azure portal.
This format was originally used by the Berkeley Internet Name Domain (BIND) software package, but has been widely adopted by other DNS server software – though some of them (e.g.
NSD, Power DNS) are using the zone files only as a starting point to compile them into database format, see also Microsoft DNS with Active Directory-database integration.
Resource records may occur in any order in a zone file, with some exceptions. ; equivalent to above line, "@" represents zone origin @ IN MX 50 mail3 ; equivalent to above line, but using a relative host name
The format of the Azure CLI command to export a DNS zone is: As with the zone import, you first need to sign in, choose your subscription, and configure the Azure CLI to use Resource Manager mode.
A Domain Name System (DNS) zone file is a text file that describes a DNS zone.
The description consists of several fields separated by white space (spaces or tabs) as follows: The name field may be left blank.
If so, the record inherits the field from the previous record.