DNS

What

• DNS stands for “Domain Name System”

• At the most basic level DNS provides a key/value lookup from a domain name (e.g., google.com) to an IP address (e.g., 85.129.83.120), which is required in order for your computer to route a request to the appropriate server.

  • Analogizing to phone numbers, the difference between a domain name and IP address is the difference between “call John Doe” and “call 201-867–5309.”

• you need DNS to look up the IP address for a domain

Creating new DNS for old systems

• Can have multiple DNS ie aliases for the same endpoint.

• If the application is not changing the entrypoint to cater for the new path, can use nginx/ingress to map the new dns and path to the application's entry point path

  • ie app.com/ -> /

  • ie app.com/ and blah.com/ -> /

  • ie app.com/direct -> /direct

Links

• https://www.freecodecamp.org/news/what-is-dns-anyway/