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DNS: Create a Forward Zone

Zones and zone files are key components in configuring DNS servers. In this lab, we will configure a forward zone and a forward zone file, then add TTL, SOA, NS, and A records. Next, we will run a syntax check on the `named.conf` and the forward zone file with `named-checkconf` and `named-checkzone`, respectively. 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.

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Path Info

Clock icon Intermediate
Clock icon 15m
Clock icon May 01, 2020

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Table of Contents

  1. Challenge

    Add the forward zone configuration to the `/etc/named.conf` file. Then run the `named-checkconf` command to verify the configuration.

    1. Add the forward zone configuration:
    vim /etc/named.conf
    1. Insert the zone configuration just before the include statements at the bottom of the file:
    zone "" {
       type master;
       file "/var/named/";
    1. Run the named-checkconf command to verify the configuration.
  2. Challenge

    Create the forward zone file and check the configuration for syntax errors with `named-checkzone`.

    1. Create the forward zone file and enter the following information:
    vim /var/named/
    1. Enter in the following:
    $TTL    86400
    @       IN      SOA (
                              10030         ; Serial
                               3600         ; Refresh
                               1800         ; Retry
                             604800         ; Expiry
                              86400         ; Minimum TTL
    ; Name Server
    @        IN      NS
    ; A Record Definitions
    nameserver       IN      A
    mailprod         IN      A
    mailbackup       IN      A
    ; Canonical Name/Alias
    dns        IN    CNAME
    ; Mail Exchange Records
    @        IN    MX    10
    @        IN    MX    20
    1. Run the named-checkzone command to check the zone file for syntax errors.
    named-checkzone /var/named/
  3. Challenge

    Change the file permissions and the group owner for `/var/named/`.

    1. Change the file permissions for /var/named/
    chmod 760 /var/named/
    1. Change the group owner of the file to named.
    chgrp named /var/named/
  4. Challenge

    Restart the named service.

    systemctl restart named
  5. Challenge

    Run a query to test the configuration.

    nslookup localhost

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