DNS is the internet Yellow Pages. It connects the domain names to IP addresses. If you enter the domain name in the search bar of your browser, the browser queries the DNS and returns the IP address of the resource. And as you can see,if DNS is broken, the wrong resource IP can be returned, resulting in unavailability of the server, or worse, presenting phishing sites. DNS is the most vital component of the internet.

Because DNS is so vital, it is very well protected, it is distributed and decentralised. And more functionality is added to the database, like security features as DNSsec to assure authenticity of presented sites.

DNS entries are managed via the domain registrars.

For our self-hosting purposes several DNS records must be managed:

• A-records and AAA-records translate domain names in IPv4 and IPv6 addresses respectively
• CAA-record types are needed for the TLS certificates, used by the “Lets encrypt” integration
• CNAME-records can be used for referral purposes
• TEXT and MX types of records are mostly used for email, Yunohost will help you configure these records for your server.

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