Skip to content

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.
  • Labs icon Lab
  • A Cloud Guru
Google Cloud Platform icon

DNS: Create a Reverse Zone File

Creating reverse zones is crucial to DNS server configuration, and in performing reverse name service lookups. In this video, we will see how to configure the zone in `/etc/named.conf` and create the Start of Authority record as well as other records in the reverse zone file. Then we'll test our configuration with a reverse query.

Google Cloud Platform icon

Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon May 01, 2020

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.

Table of Contents

  1. Challenge

    Get the IP Address for the Primary Interface for the Lab Server

    Record the IP address for the primary interface:

    ifconfig -a
  2. Challenge

    Add the Reverse Zone Configuration to the /etc/named.conf File. Then Run the named-checkconf Command to Verify the Configuration

    vim /etc/named.conf

    Take the last three octets of the public IP address and enter them in reverse where you see (such as 11.31.172). Insert the zone configuration just before the include statements at the bottom of the file:

    zone "" {
       type master;
       file "/var/named/";

    Then run the named-checkconf command to verify the configuration.

  3. Challenge

    Create the Reverse Zone File and Check the Configuration for Syntax Errors with named-checkzone

    1. Create the reverse zone file and enter the following information:
      vim /var/named/
    2. Enter in the following:
      $TTL    86400
      @       IN      SOA (
                                10030         ; Serial
                                 3600         ; Refresh
                                 1800         ; Retry
                               604800         ; Expiry
                                86400         ; Minimum TTL
      ; Name Server
      @        IN      NS
      ; PTR Record Definitions
      93       IN      PTR
      30       IN      PTR
      72       IN      PTR
      ; Mail Exchange Records
      @		IN	MX	10
      @		IN	MX	20
    3. Run the named-checkzone command to check the zone file for syntax errors.
  4. Challenge

    Change the File Permissions and the Group Owner for /var/named/

    1. Change the file permissions for /var/named/
      chmod 760 /var/named/
    2. Change the group owner of the file to named:
      chgrp named /var/named/
  5. Challenge

    Restart the named Service

    systemctl restart named
  6. Challenge

    Run a Query to Test the Configuration

    nslookup x.x.x.x localhost

    Replace x.x.x.x with what ifconfig -a returned for an IP address earlier.

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.

Start learning by doing today

View Plans