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ssh.md

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Install

sudo apt-get install openssh-server

Connect

ssh -p PORT USER@SERVER_IP

# Execute one command and exit.
ssh -p PORT USER@SERVER_IP ls

SSH in Virtual Machine needs a port forwarding rule in network settings for the VM. Name ssh, host port 3022, guest port 22.

# SSH to local VM via port forwarding.
ssh -p 3022 [email protected]

sudo command

# It will ask for the root password in the remote machine
ssh -t [email protected] "sudo command"

Alias

/etc/ssh/ssh_config   # system-wide
~/.ssh/config         # per user (better)

# Add this in the config.
Host server_name
  Port 22
  User user
  HostName 123.456.789.255

# Connect with this now.
ssh server_name

SSH with RSA key

This is used to log in without writing the password each time. Also, it is much more secure.

Generate private/public keys in /home/user/.ssh

ssh-keygen
  • Private key id_rsa stays in the host machine in ~/.ssh.
  • Public key id_rsa.pub goes on the server in a ~/.ssh/authorized_keys file.

Simple as that, the next ssh is password-less.

To transfer a public key, use this:

ssh-copy-id [email protected]

This automates the manual creation of an ~/.ssh/authorized_keys file and putting the id_rsa.pub key in.