What is the best way to protect your server from hacking and dos attacks?

Question

linux

Previously, I launched a Django server uWSGI and Nginx on Ubuntu 14.04, but for some reason after 20 minutes I lost access via ssh (
Please tell me what is the best way to protect yourself from attacks from outside, thanks in advance)

Answer 1

Most likely they are brute forcers.
There is information here.
Google in the direction of protection against brute force.

Answer 2

you need to turn off password authorization, only using keys and allow login only to your user (not root)
https://serversforhackers.com/series/ssh-usage-tip...

Answer 3

cloudflare will go the main thing then un shoot off

Answer 4

1. fail2ban
2. in the file /etc/ssh/sshd_config add:
# Authentication:
LoginGraceTime 120
PermitRootLogin prohibit-password
StrictModes yes
# What ports, IPs and protocols we listen for - port for ssh access
# prescribe your own other than 22, for example 22222
Port 22

Answer 5

port-knocking