DNS Server (BIND)

1# Ubuntu / Debian
2sudo apt-get update
3sudo apt-get install -y bind9 bind9utils bind9-doc
4 
5# RHEL / Fedora
6sudo dnf install -y bind bind-utils
7 
8sudo systemctl enable named
9sudo systemctl start named

1sudo nano /etc/bind/named.conf.local
2 
3# Add zone block:
4zone "example.com" {
5    type master;
6    file "/etc/bind/db.example.com";
7};
8 
9# Create zone file:
10sudo nano /etc/bind/db.example.com
11 
12# Example records:
13# $TTL 86400
14# @   IN SOA ns1.example.com. admin.example.com. (2024010101 3600 1800 604800 86400)
15# @   IN NS  ns1.example.com.
16# ns1 IN A   192.168.1.10
17# www IN A   192.168.1.20
18 
19sudo named-checkconf
20sudo named-checkzone example.com /etc/bind/db.example.com
21sudo systemctl restart named

1zone "1.168.192.in-addr.arpa" {
2    type master;
3    file "/etc/bind/db.192";
4};
5 
6# db.192:
7# 10  IN PTR ns1.example.com.
8# 20  IN PTR www.example.com.

1# Ubuntu — Netplan or resolv.conf
2echo "nameserver 192.168.1.10" | sudo tee /etc/resolv.conf
3 
4# Test
5dig @192.168.1.10 www.example.com
6nslookup www.example.com 192.168.1.10

1dig @localhost example.com
2dig @localhost www.example.com A
3sudo journalctl -u named -f

1# Increment serial number in SOA when editing zone
2sudo rndc reload example.com
3sudo rndc status
4 
5# Flush cache
6sudo rndc flush