How to Plesk 🐙

Setting up your own name servers (vanity) on "only" 1. Web server with Plesk. This tutorial explicitly refers to the following environment
- 1und1 Dedicated Server / Cloud Server and all hosting contracts with additional IPv4 / IPv6.
- 3 IPv4 [1 default IPv4 (webhosting) and 2 IPv4 for own DNS server]
- Plesk with DNS server as "Primary Name Server".
Operating system and web server (Apache with or without Nginx, or IIS) is unimportant

Elasticsearch is a powerful, fast search engine for Unix and requires Java 8 or higher.
Elasticsearch is characterized by an extremely high performance, speed and accuracy with the largest data volume. In combination with the world-renowned forum and community software from WoltLab with its state-of-the-art content management system, Elasticsearch gets up to speed starting at 100,000 data records and impresses with its amazingly high performance.

No access to Plesk Panel – Error 500 – What to do now?
MySQL server doesn't start?
Solution: You have to delete MySQL socket! The rebirth of the MySQL socket.
Only two little commands are the ultimate solution after an unsuccessful start of MySQL server and the entire Plesk panel.
Have fun with the following solution. Knowledge is power.