Install OpenSSH Server in ubuntu

Install OpenSSH Server

# In server

sudo apt install openssh-server
sudo vim /etc/ssh/sshd_config

- Edit sshd_config change to

PasswordAuthentication no

sudo service ssh restart
sudo ufw allow ssh

# In client

ssh-keygen
cd .ssh
cat id_rsa.pub
- Copy public key

# In Server

- ssh for user
echo "public_key_string" >> /home/<user>/.ssh/authorized_keys
- ssh for root
echo "public_key_string" >> /root/.ssh/authorized_keys

sudo service ssh restart

# In client

ssh <user>@<serverIP>