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Jeff
Asked: 2012-10-26 01:12:39 +0800 CST

How do I update my servers' domain name for Reverse DNS?

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I'm updating my mail servers' rDNS and I think I have it all figured out except for one thing.

When I installed my OS (Debian Etch), the installer asked me to enter the "domain name".

  1. Is the "domain name" updated by using the hostname command?
  2. If so, which config file(s) are updated when using the hostname command?
  3. If not, how do I change my servers' domain name?

My current /etc/hosts:

127.0.0.1       localhost
67.228.178.164  mrspock.example-old.com      mrspock

My current /etc/hostname:

mrspock

$ hostname -f

mrspock.example-old.com

I need to update hostname -f to be mrspock.example-new.com.

debian

2 Answers

  1. Best Answer

    Answering my own question.

    It appears (according to this and this) that you only need to update /etc/hosts to change the domain name specified during install on a Debian system:

    127.0.0.1       localhost
67.228.178.164  mrspock.example-new.com      mrspock

    That should do it. Please correct me if I'm wrong, but I can't find any other info on changing the domain name. Also, hostname -f produces "mrspock.example-new.com" after updating /etc/hosts, as expected.

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  2. Is the "domain name" updated by using the hostname command?

    If so, which config file(s) are updated when using the hostname command?

    No! hostname Command update /etc/hostname

    how do I change my servers' domain name?

    you can change your domainname by:

    # domainname <NEWNAME>
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