SSH Setup

When you create a new user in linux, and you have to login as the new user say

ssh deploy@surajg.tech

To be able to do this, perform the following steps:

• Install openssh-server

sudo apt update 
sudo apt install openssh-server

• Configure SSH server

sudo nano /etc/ssh/sshd_config

• Port: By default, SSH uses port 22. You can change this port if desired, especially for security reasons.
• Permit Root Login: It's generally recommended to disable remote root login for security purposes. You can set this option to no.
• Password Authentication: You may choose to allow or disallow password authentication for SSH. Disabling password authentication and using SSH keys instead is generally more secure.
• Allow Users/Allow Groups: You can specify which users or groups are allowed to connect via SSH.
• Restart SSH Service

Allow SSH Through Firewall

sudo ufw allow
ssh sudo ufw enable

Open /etc/ssh/sshd_config

• Add the following lines:

PubkeyAuthentication yes 
AuthorizedKeysFile .ssh/authorized_keys

• Create a folder

mkdir -p ~/.ssh

• Paste your public key in your machine

sudo nano ~/.ssh/authorized_keys

• To ensure right syntax

cat /usr/sbin/sshd -t

• Ensure that the .ssh directory and the authorized_keys file have the correct permissions. The .ssh directory should have permissions 700, and the authorized_keys file should have permissions 600. You can set these permissions using the chmod command.