How to create elliptic-curve key for ansible user and add it to remote servers using Bash script

Here is a video tutorial

Scripts and configuration files are available here:

Install sshpass

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sudo zypper install sshpass

Debian

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sudo apt install sshpass

Red Hat

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sudo dnf install sshpass

Create a file

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vim pass_file_ansible

and place a password for the ansible user to connect to remote hosts.

Make the script read only for this user

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chmod 400 pass_file_ansible

Create a list of servers with IP addresses or hostnames

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vim servers

Create a script

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vim  ssh-copy-id.sh

And add the below content

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#!/bin/bash
ssh-keygen -t ed25519 -C "ansible@rancher.local"
servers=$(cat servers)
for i in $servers; do
  sshpass -f pass_file_ansible ssh-copy-id -i ~/.ssh/id_ed25519.pub ansible@$i
done

Make sure that PasswordAuthentication has set boolean value to yes in /etc/ssh/sshd_config file on remote servers.
Make the script executable

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chmod +x ssh-copy-id.sh

Execute the script

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./ssh-copy-id.sh