Basic SSH Configuration (Ubuntu Server 16.04)
Basic SSH Server configuration
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1) Install SSH Server
$ sudo apt update
$ sudo apt install openssh-server
*note: for older version of ubuntu use "apt-get"
$ sudo systemctl enable ssh
$ sudo systemctl start ssh
*note: ssh run on port 22
2) Basic Configuration
Change port number
Port 22222
Set maximum login attempt to 3 (default is 6)
MaxAuthTries=3
Disable password authentication
PasswordAuthentication no
Restart SSH server
sudo systemctl restart ssh
now we need to use the private key to login to server
3) Connecting to ssh server using public key
Check .ssh directory and make sure "authorized_keys" is available,
$ ls ~/.ssh/
$ touch ~/.ssh/authorized_keys
Create SSH Keys (for linux only) for windows please use (putty keygen)
$ ssh-keygen
Check for your public key
$ cat ~/.ssh/id_rsa.pub
4) Download Link
Putty -- https://cnhv.co/23t2
puttygen -- https://cnhv.co/23v0