SSH to an AWS server by name

aws_ssh.sh

function instance_by_name() {
  aws ec2 describe-instances \
    --filters "Name=tag:Name,Values=$1"  \
    | jq -r '.Reservations | map(.Instances) | flatten | map(.NetworkInterfaces) | flatten | map(.Association.PublicIp) | first'
}

SSH_KEY="/path/to/ssh/key"
alias staging='ssh -i $SSH_KEY ec2-user@$(instance_by_name staging)'
alias production='ssh -i $SSH_KEY ec2-user@$(instance_by_name production)'

May want to add a comment distinguishing, e.g., "the production server" from "a production server", which hopefully won't matter much, but could cause some confusion if someone were expecting to find specific log output, etc.