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Top Forums UNIX for Advanced & Expert Users Changing hosting company for one domain, how to deal with DNS? Post 303043351 by Neo on Saturday 25th of January 2020 11:00:53 PM
Old 01-26-2020
This is all controlled by the TTL (time-to-live) settings of your DNS entries.

Long before any such transition is done, you should set the TTL of all your DNS entries to the shortest possible time.

As I recall, the shortest TTL most DNS providers permit is around 5 or 10 minutes, but please check me on that. YMMV based on DNS provider.

Because DNS is cached in the global Internet, you need to begin this "set our DNS TTLs short" long before the transition process.

The first step is to know what your current TTLs are.

Do you know the value of this critical metric?
 

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Net::DNS::Question(3)					User Contributed Perl Documentation				     Net::DNS::Question(3)

NAME
Net::DNS::Question - DNS question class SYNOPSIS
"use Net::DNS::Question" DESCRIPTION
A "Net::DNS::Question" object represents a record in the question section of a DNS packet. METHODS
new $question = Net::DNS::Question->new("example.com", "MX", "IN"); Creates a question object from the domain, type, and class passed as arguments. qname, zname print "qname = ", $question->qname, " "; print "zname = ", $question->zname, " "; Returns the domain name. In dynamic update packets, this field is known as "zname" and refers to the zone name. qtype, ztype print "qtype = ", $question->qtype, " "; print "ztype = ", $question->ztype, " "; Returns the record type. In dymamic update packets, this field is known as "ztype" and refers to the zone type (must be SOA). qclass, zclass print "qclass = ", $question->qclass, " "; print "zclass = ", $question->zclass, " "; Returns the record class. In dynamic update packets, this field is known as "zclass" and refers to the zone's class. print $question->print; Prints the question record on the standard output. string print $qr->string, " "; Returns a string representation of the question record. data $qdata = $question->data($packet, $offset); Returns the question record in binary format suitable for inclusion in a DNS packet. Arguments are a "Net::DNS::Packet" object and the offset within that packet's data where the "Net::DNS::Question" record is to be stored. This information is necessary for using compressed domain names. COPYRIGHT
Copyright (c) 1997-2002 Michael Fuhr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Update, Net::DNS::Header, Net::DNS::RR, RFC 1035 Section 4.1.2 perl v5.8.0 2002-10-12 Net::DNS::Question(3)
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