About

This is a guide for setting up SSH on Unix systems. This guide assumes that the SSH server is running on a Unix system and the client is also a Unix system.

Server Setup

1. Install SSH server

   # Arch
   sudo pacman -S openssh
   
   # Ubuntu
   sudo apt install openssh-server

2. Start SSH server

   sudo systemctl start sshd
   sudo systemctl enable sshd

3. Configure SSH server

   sudo vim /etc/ssh/sshd_config

   # Disable password authentication
   PasswordAuthentication no
   
   # Disable root login
   PermitRootLogin no
   
   # Only allow specific users
   AllowUsers <username>

Client Setup

1. Generate SSH key

   ssh-keygen -t ed25519 -C "[email protected]"

2. Copy SSH key to server

   ssh-copy-id -i ~/.ssh/id_ed25519.pub <username>@<server_ip>

3. Configure SSH client

   vim ~/.ssh/config

   Host <alias>
       HostName <server_ip>
       User <username>
       IdentityFile ~/.ssh/id_ed25519