What is Nginx default port?

Nginx uses port 80 for HTTP and 443 for HTTPS.

What is MySQL default port?

MySQL uses port 3306 for client connections.

Redis uses port 6379 by default.

Domain Name System servers and resolvers

3 services

bind9 systemctl: named

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Most widely used DNS server. Authoritative and recursive resolver.

apt install bind9 bind9-utils bind9-dnsutils

53tcpDNS queries (TCP)53udpDNS queries (UDP)953tcprndc control

dnsmasq systemctl: dnsmasq

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Lightweight DNS forwarder and DHCP server. Good for small networks and development.

apt install dnsmasq

53tcpDNS53udpDNS67udpDHCP server68udpDHCP client

unbound systemctl: unbound

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Validating, recursive, caching DNS resolver. Lightweight and secure.

apt install unbound unbound-anchor

53tcpDNS53udpDNS