How to add ssh keys to multiple hosts

Thanh Phu on January 6, 2020

Requisite

  • list.txt: list of hosts
  • ~/.ssh/id_rsa.pub: keys to add

Bash script

copy.sh

#!/bin/bash
for ip in `cat list.txt`; do
    sshpass -p "yourpassword" ssh-copy-id -o StrictHostKeyChecking=no -i ~/.ssh/id_rsa.pub [email protected]$ip
done

Explanation

  • sshpass pass your password to the ssh prompt
  • -o StrictHostKeyChecking=no ignores the “host identity not established” prompt, allowing sshpass to do its job

How to execute

sudo apt install -y sshpass
chmod +x copy.sh
./copy.sh

Reference