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DNS: 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

Level
Clock icon Intermediate
Duration
Clock icon 15m
Published
Clock icon May 01, 2020

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Table of Contents

  1. Challenge

    Log in to the lab server with the `cloud_user` and issue `sudo -i` to gain root access.

    $ ssh cloud_user@**.**.**.** . (your lab server IP)
Password:

    $ sudo -i
[sudo] password for cloud_user: 
# 
# id
uid=0(root) gid=0(root) groups=0(root) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

  2. Challenge

    Install the `bind` and `bind-utils` packages. Start and enable the `named` service.

    1. Install bind and bind-utils:
    # yum install -y bind bind-utils
    1. Start and enable the named service:
    # systemctl start named
# systemctl enable named

  3. Challenge

    Recreate the RNDC key and configuration file.

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

  4. Challenge

    Link the RNDC configuration to the `named` configuration.

    1. Open the /etc/rndc.conf file with vim:
    # vim /etc/rndc.conf

    1. Copy the section "Copy to the named.conf file"

    2. Open the /etc/named.conf file for editing with vim.

    # vim /etc/named.conf
    1. Paste the copied section into /etc/named.conf just before the include statements and delete the # signs at the beginning of the lines.

  5. Challenge

    Start the `named` service.

    # systemctl start named

  6. Challenge

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

    # nslookup www.google.com 127.0.0.1
A Cloud Guru - Labs - DNS: Working with RNDC Keys
Author
A Cloud Guru

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!

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