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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resolvxc

RESOLV.CONF(5)							File Formats Manual						    RESOLV.CONF(5)

NAME

       resolv.conf - Domain Name System resolver configuration

SYNOPSIS

       /etc/resolv.conf

DESCRIPTION

       The  /etc/resolv.conf  is used to configure how the host will use the Domain Name System to resolve hostnames to IP addresses.  It may con-
       tain these two lines:

	      nameserver     IP-address
	      domain	     domain-name

       The nameserver entry tells the IP address of the host to use for DNS queries.  If it is set to 127.0.0.1 (which is the  default)  then  the
       local  name  daemon is used that may use the /etc/hosts database to translate host names.  You normally only need a nameserver entry if the
       name server is at the other side of a router.  The default nonamed name server can't look beyond the local network.

       The domain entry tells the default domain to use for unqualified hostnames.  This entry is usually not given in which case  the	domain	of
       the local host is used.

       The long version of this story can be found in resolver(5).

FILES

       /etc/resolv.conf    DNS resolver configuration file.

SEE ALSO

       resolver(5), hosts(5), nonamed(8), boot(8).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																    RESOLV.CONF(5)