How to fix DNS Internal Resolution inside the Nginx docker container
Sometimes, errors with Docker and some containers can become cryptic when it is about networking. Today, it was Nginx that was not able to reach another container.
Install and configure a DNS server with Bind9 on Linux
A service DNS (Domain Name Service) allows domain name resolution to an IP Address and other resources. This service is useful for example for browsing internet websites and not have to know IPs addresses for these websites.