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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LEARN ABOUT CENTOS

pdns_control

PDNS_CONTROL(8) 					      System Manager's Manual						   PDNS_CONTROL(8)

NAME

       pdns_control - Control the pDNS nameserver

SYNOPSIS

       pdns_control [options] command

DESCRIPTION

       pdns_control is used to send commands to a running pDNS nameserver.

OPTIONS

       A summary of options is included below.

       --help
	      Show summary of options.

       --chroot=...
	      Where PowerDNS is chrooted

       --config-dir=...
	      Location of configuration directory (pdns.conf)

       --config-name=...
	      Name of this virtual configuration - will rename the binary image

       --remote-address=...
	      Remote address to query

       --remote-port=...
	      Remote port to query

       --secret=...
	      Secret needed to connect to remote PowerDNS

       --socket-dir=...
	      Where the controlsocket will live

COMMANDS

       ccounts
	      Show the content of the cache

       notify <domain>
	      Adds  a  domain  to  the	notification list, causing PDNS to send out notifications to the nameservers of a domain. Can be used if a
	      slave missed previous notifications or is generally hard of hearing.

       notify-host <domain> <host>
	      Same as above but with operator specified IP address as destination, to be used if you know better than PowerDNS.

       cycle  Restart the nameserver so it reloads its configuration.

       ping   Check if the server is alive.

       purge [<record>]
	      Purge entries from the packet cache. If the record name ends with a dollar ($) all entries that end with that name are  removed.	If
	      no record is specified the entire cache is purged.

       rediscover
	      Instructs backends that new domains may have appeared in the database, or, in the case of the Bind backend, in named.conf.

       retrieve <domain>
	      Retrieve a slave domain from its master. Done nearly immediatly.

       set <variable> <value>
	      Set the configuration parameter <variable> to <value>. Currently only the query-logging can be set.

       show <variable>
	      Show a single statistic, as present in the output of the list command.

       quit   Tell a running pdns_server to quit.

       status Show usage statistics.

       uptime Show the uptime of the running server.

       version
	      Print the version of the running pdns daemon.

FILES

       <socket>
	      Control socket used to communicate with pdns_server.

SEE ALSO

       pdns_server(8)

PowerDNS							   December 2002						   PDNS_CONTROL(8)