SSH

creating a ssh key

ssh-keygen -t rsa -C "my server"

set a path where it should save

confirm 2 times with enter so no password is set

the key is now generated

connect to your server using your normal password

ssh root@myip

create the .ssh folder

mkdir ~/.ssh

open ~/.ssh/authorized_keys using nano

nano ~/.ssh/authorized_keys

copy your public key from the .pub file (in this example my-server.pub) and paste it into the ssh session

close nano by pressing ctrl + X

confirm with Y

confirm with Enter

open the sshd (ssh deamon) config file using nano

nano /etc/ssh/sshd_config

enabling using ssh key by removing the # Infront of PubkeyAuthentication yes

before:

#PubkeyAuthentication yes

after:

PubkeyAuthentication yes

disabling the password usage by replacing yes with no in at PasswordAuthentication

before:

PasswordAuthentication yes

after:

PasswordAuthentication no

close nano once again using CTRL + X, confirming with Y, and then confirming with enter

restart sshd

service sshd restart

exit the ssh session

exit

connect again using the ssh key

ssh root@myip -i my-server

now everything is done, auth over password isn’t possible anymore and your server is secured using an ssh key.