DNS and BIND: Create a Forward Zone File

15 minutes
  • 6 Learning Objectives

About this Hands-on Lab

Zone files are a key component of configuring DNS servers. In this lab we will configure a forward zone file, and add TTL, SOA, NS and A records. This allows a name server to resolve a query, given the hostname, and returns the IP address. This is the most common type of DNS query.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install and Start the Named Service, then Create the File /var/named/fwd.labdomain.com.db
yum install -y bind
systemctl start named
vim /var/named/fwd.labdomain.com.db
Add the TTL and SOA Records to the Zone File

 $TTL 86400  

@       IN      SOA     nameserver.labdomain.com.     root.labdomain.com.      (
                                10030   ;Serial
                                3600    ;Refresh
                                1800    ;Retry
                                604800  ;Expiry
                                86400   ;Minimum TTL
)
Add the NS Record to the Zone File
@       IN      NS      nameserver.labdomain.com.
Add the A Records to the Zone File
nameserver      IN      A       172.31.18.93
mailprod        IN      A       172.31.18.30
mailbackup      IN      A       172.31.18.72
Add the CNAME Record to the Zone File
dns     IN      CNAME   nameserver.labdomain.com.
Save the File and Quit the Editor
:wq

Additional Resources

ABC Company is currently in the process of setting up their own internally-hosted DNS service. The next phase of the project is to create the forward zone files. The DNS administrator fell sick and is unavailable, but there the project has a tight timeline. We have been designated as a resource to create the forward zone files until the DNS Administrator returns.

To complete this lab, we need to use the vim command to create and open a forward zone file and create the following records to complete this lab:

TTL Record
SOA Record
A Records:
nameserver
mailprod
mailbackup
CNAME Record:
dns = nameserver.yourdomain.com.

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