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DNS and BIND: Working with RNDC Keys

BIND uses a shared secret key authentication method to grant privileges to hosts. It is important to know how to generate this key for administration purposes. In this hands-on lab we will learn to configure the RNDC key and configuration file, and link it to the `named` service. To accomplish this, we will install the BIND package and recreate the RNDC key and configuration. We will then copy the new configuration to the `named.conf` file. To complete this lab, you will have to show that a new configuration has been created and that DNS queries are being cached on `localhost`.

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Path Info

Clock icon Intermediate
Clock icon 15m
Clock icon Oct 18, 2019

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Table of Contents

  1. Challenge

    Install, start, and enable the `named` service.

    # yum install bind bind-utils -y
    # systemctl start named
    # systemctl enable named
  2. Challenge

    Recreate the RNDC key and configuration file.

    • Remove the rndc key file. rm /etc/rndc.key
    • Stop the named service. systemctl stop named
    • Generate an rndc key and configuration file. rndc-confgen -r /dev/urandom > /etc/rndc.conf
  3. Challenge

    Link the RNDC configuration to the named configuration.

    • Open the /etc/rndc.conf file with vim /etc/rndc.conf
    • Copy the section "Copy to the named.conf file"
    • Open the /etc/named.conf file for editing with vim /etc/named.conf
    • Paste the section into /etc/named.conf just before the include statements and delete the # signs at the beginning of the lines.
  4. Challenge

    Start the named service.

    systemctl start named
  5. Challenge

    Test the configuration to ensure DNS records are being cached on localhost.


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