DNS: Configure a Caching Only Name Server

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15 minutes
  • 5 Learning Objectives

About this Hands-on Lab

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.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

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">
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
Install the `bind` and `bind-utils` packages.
# yum install -y bind bind-utils
Verify the `named` configuration for `localhost`. Then check the configuration for syntax errors with the `named-checkconf` command.
# cat /etc/named.conf
# named-checkconf
Start and enable the `named` service.
# systemctl start named
# systemctl enable named
Run a DNS query against the DNS server defined in `/etc/resolv.conf`. Next, run a DNS query against `localhost`.
# nslookup google.com
# nslookup google.com localhost

Additional Resources

First, we'll install the bind and bind-utils packages. Then, verify the named configuration for localhost and check the configuration with named-checkconf. Finally, we'll start the named service and test name resolution using the nslookup command.

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