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DNS: Configure a Caching Only Name Server

Creating a caching-only name server is the most basic type of BIND configuration. This configuration is the main building block for more advanced BIND configurations. Students will learn to configure a caching-only name server and test name resolution with the `nslookup` command.

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Path Info

Clock icon Beginner
Clock icon 15m
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@<"provided lab server IP">
    $ 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.

    # yum install -y bind bind-utils
  3. Challenge

    Verify the `named` configuration for `localhost`. Then check the configuration for syntax errors with the `named-checkconf` command.

    # cat /etc/named.conf
    # named-checkconf
  4. Challenge

    Start and enable the `named` service.

    # systemctl start named
    # systemctl enable named
  5. Challenge

    Run a DNS query against the DNS server defined in `/etc/resolv.conf`. Next, run a DNS query against `localhost`.

    # nslookup
    # nslookup localhost

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