SSH

SSH

Vocabulary

• SSH stands for Secure SHell
• SSH is a remote login program
• SSH uses port 22 to connect your computer to another computer
• The ssh-agent is a program that holds private keys used for public key authentication. See: https://linux.die.net/man/1/ssh-agent
• $SSH_AUTH_SOCK is an env variable required for ssh-add to work

Helpful Commands

• SSH into an ubuntu server on port 2222

  • ssh -i <key> ubuntu@<address> -p 2222 -vvvv

• Add your rsa_id or dsa_id to the ssh-agent

  • ssh-add

• Delete all identities from the agent:

  • ssh-add -D

• Add an identity to the ssh-agent and store the passprhase in your keychain.

  • ssh-add -K ~/.ssh/id_rsa

• Start the ssh-agent in the background

  • eval "$(ssh-agent -s)"

• Create a public key using a private key that lives in a file

  • ssh-keygen -y -f <private key> > <public key>