SSH

• https://docs.github.com/en/github/authenticating-to-github/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent#adding-your-ssh-key-to-the-ssh-agent
• https://linux.101hacks.com/unix/ssh-add/
• https://www.funtoo.org/OpenSSH_Key_Management,_Part_2
• https://www.freecodecamp.org/news/the-ultimate-guide-to-ssh-setting-up-ssh-keys/

KEYGEN

Create a SSH new key

ssh-keygen -t rsa

AGENT

Start agent

eval "$(ssh-agent -s)"

List agent identities

ssh-add -l

Add SSH private key to agent

ssh-add -K ~/.ssh/id_rsa

Remove all identities from agent

ssh-add -D

load all keys from keychain

get the agent to load all keys whose passphrases are stored on Keychain

ssh-add -A 

Kill agent

ssh-agent -k

COPY

Copy public key to remote server

ssh-copy-id -i ~/.ssh/id_rsa user@host

Add your public key to authorized_keys

cat your_public_key.pub >> .ssh/authorized_keys

Debug SSH commands

ssh -v {commands}

CONNECT

ssh -i ~/.ssh/mykey

Steps to create & authenticate a key

1. Create a key with: ssh-keygen -t rsa
1. Add a passphrase
1. Copy the public key to the remote resource
1. Add the key to the local agent: ssh-add -K /path/to/key
1. Add passphrase here (this is the first and last time)
1. Add the host entry to ~/.ssh/config
1. Test with ssh {Host from config}

Tunneling

ssh -L [LOCAL_IP:]LOCAL_PORT:DESTINATION:DESTINATION_PORT [USER@]SSH_SERVER