Bind: Can you configure multiple domains using the same nameserver Post: 303039479

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Top Forums UNIX for Beginners Questions & Answers Bind: Can you configure multiple domains using the same nameserver Post 303039479 by rbatte1 on Monday 7th of October 2019 10:53:31 AM

10-07-2019

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It is usually (but not always) better to keep to a single A record for an IP address with a matching PTR record so the IP address can be used to find out the host. Other things, such as service names or alternate domain entries can be added as CNAME or alias records. If you have a service that other things connect to and use that has a logical name, then it is usual to define that as an alias. When you come to replace your servers, if the applications all use a CNAME/alias then you can edit the DNS to move the alias to point to the new server when you are happy that it is ready.

Additionally, if you have a cluster of servers, you might consider more things. For an Active/Passive cluster, you would have an A record for each server, but make every connection to the application(s) to use a separate IP address that you move to the active server, a virtual IP if you like. Consider:-

ServerA: 10.10.10.1 with PTR of 10.10.10.1 to ServerA
ServerB: 10.10.10.2 with PTR of 10.10.10.2 to ServerB
ServerC: 10.10.10.3 with PTR of 10.10.10.3 to ServerC
Myapp: 10.10.10.101 with no PTR record

Make the 'active' server also offer the Myapp IP address and make connections point to service name Myapp

For an Active/Active cluster, you need some sort of load-balancer, but that's a whole extra topic.

What do you actually want to do with the applications offered by the server and how would you consider transferring them to a replacement later?

Robin

rbatte1

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mail::spf::mech::ptr

Mail::SPF::Mech::PTR(3) 				User Contributed Perl Documentation				   Mail::SPF::Mech::PTR(3)

NAME

       Mail::SPF::Mech::PTR - SPF record "ptr" mechanism class

DESCRIPTION

       An object of class Mail::SPF::Mech::PTR represents an SPF record mechanism of type "ptr".

   Constructors
       The following constructors are provided:

       new(%options): returns Mail::SPF::Mech::PTR
	   Creates a new SPF record "ptr" mechanism object.

	   %options is a list of key/value pairs representing any of the following options:

	   qualifier
	   domain_spec
	       See "new" in Mail::SPF::Mech.

       new_from_string($text, %options): returns Mail::SPF::Mech::PTR; throws Mail::SPF::ENothingToParse, Mail::SPF::EInvalidMech
	   Creates a new SPF record "ptr" mechanism object by parsing the string and any options given.

   Class methods
       The following class methods are provided:

       default_qualifier
       qualifier_pattern
	   See "Class methods" in Mail::SPF::Mech.

       name: returns string
	   Returns 'ptr'.

       name_pattern: returns Regexp
	   Returns a regular expression that matches a mechanism name of 'ptr'.

   Instance methods
       The following instance methods are provided:

       text
       qualifier
       params
       stringify
	   See "Instance methods" in Mail::SPF::Mech.

       domain_spec: returns Mail::SPF::MacroString
	   Returns the "domain-spec" parameter of the mechanism.

       match($server, $request): returns boolean
	   Checks whether the mechanism's target domain name, or a sub-domain thereof, is a "valid" domain name for the given request's IP address
	   (see "ip_address" in Mail::SPF::Request), and returns true if it does, or false otherwise.  See "valid_domain_for_ip_address" in
	   Mail::SPF::Util for how domains are validated.  See RFC 4408, 5.5, for the description of an equivalent algorithm.

SEE ALSO

       Mail::SPF, Mail::SPF::Record, Mail::SPF::Term, Mail::SPF::Mech

       <http://tools.ietf.org/html/rfc4408>

       For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS

       Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>

perl v5.16.2							    2013-08-25						   Mail::SPF::Mech::PTR(3)