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Ssh

Open SSH as server

  • Install SSH server 
    sudo apt update
sudo apt install openssh-serve
sudo systemctl status ssh  # Check ssh running status
    If SSH is running, you will see Active: active (running) in the output information.
  • Allow SSH to go through firewall
    • Check if the firewall is activated: sudo ufw status. If inactivated, you will see Status: inactivate.
    • Allow SSH to go through firewall: sudo ufw allow OpenSSH
    • Activate firewall (if inactivated): sudo ufw enable
    • Check firewall status: sudo ufw status, and you will see information like Status: active...
  • Check IP of the server. You can use anyone of the following commands: 
    ifconfig
ip addr show | grep inet
hostname -I

Connect the server by SSH from a client

ssh <username>@<server_ip_address>

Note that <server_ip_address> can be either ipv4 or ipv6.