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generate keys

mkdir .ssh; cd .ssh
ssh-keygen -t ed25519 -C "email@email.com"
# or 
ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

activate ssh-agent

  • check if agent is running
# start the ssh-agent in the background
eval "$(ssh-agent -s)"
  • add keys to the agent
ssh-add ~/.ssh/id_ed25519

autostart ssh-agent on shell login

  • add to .bashrc or .profile
env=~/.ssh/agent.env

agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }

agent_start () {
    (umask 077; ssh-agent >| "$env")
    . "$env" >| /dev/null ; }

agent_load_env

# agent_run_state: 0=agent running w/ key; 1=agent w/o key; 2=agent not running
agent_run_state=$(ssh-add -l >| /dev/null 2>&1; echo $?)

if [ ! "$SSH_AUTH_SOCK" ] || [ $agent_run_state = 2 ]; then
    agent_start
    ssh-add
elif [ "$SSH_AUTH_SOCK" ] && [ $agent_run_state = 1 ]; then
    ssh-add
fi

unset env

passwordless ssh

  • copy public key to the authorized_hosts file and place that on whatever server
cd ~/.ssh
cp id_ed25519.pub authorized_keys

Multi-ssh and tmux

  1. install tmux
  2. use ssh-multi.sh
# shell expansion with ranges to create multiple host names 
ssh-multi.sh -u jay -d "$(echo k8-ctl-{1..3}) $(echo k8-worker-{1..3}) $(echo k8-etcd-{1..3})"

put keys on git hub

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/adding-a-new-ssh-key-to-your-github-account