Use an SSH Key with Non-root Users

Introduction

AKLWEB HOST provides a feature that allows you to pre-install SSH keys when creating a new instance, so you can SSH to the instance as root with the key. However, the key doesn’t work for non-root users. This tutorial describes three methods to use SSH keys with non-root users.

Requirements

• A AKLWEB HOST Linux or BSD instance
• A non-root user account (it is example_user in this tutorial)

Option 1: Create a New SSH Key

1. SSH to the instance as root.
2. Create an SSH key for example_user.# sudo -u example_user ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/home/example_user/.ssh/id_rsa): Created directory '/home/example_user/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/example_user/.ssh/id_rsa Your public key has been saved in /home/example_user/.ssh/id_rsa.pub
3. Save the private key, /home/example_user/.ssh/id_rsa, to your computer. For example, you might copy it to your local .ssh folder as ~/.ssh/example_user_id_rsa.
4. Delete the private key from your instance.# rm /home/example_user/.ssh/id_rsa
5. Rename the public key to authorized_keys.# mv /home/example_user/.ssh/id_rsa.pub /home/example_user/.ssh/authorized_keys

If you saved the private key as ~/.ssh/example_user_id_rsa, you can SSH to the server as your non-root example_user:

$ ssh -i ~/.ssh/example_user_id_rsa example_user@192.0.2.123

Option 2: Move the root SSH Key to the Non-root User

In this case, we’ll move the root key to the example_user, which also disables the root user’s SSH key access.

1. SSH to the instance as root.
2. Create the .ssh directory for example_user.# mkdir /home/example_user/.ssh
3. Move the root key to example_user’s SSH directory.# mv /root/.ssh/authorized_keys /home/example_user/.ssh/
4. Change the ownership of the .ssh directory from root to example_user so OpenSSH can read it.# chown -R example_user:example_user /home/example_user/.ssh

Option 3: Use Startup Scripts

If you are deploying many instances, you may use the AKLWEB HOST Startup Scripts feature to create a non-root user and move the SSH key automatically.

Create a Startup Script

1. Select Scripts in the Customer Portal.
2. Click the plus button to create a new startup script.
3. Paste the following script.#!/bin/sh useradd -m -s /bin/bash example_user mv /root/.ssh /home/example_user/ chown -R example_user:example_user /home/example_user/.ssh

You can deploy instances with this script and one or more SSH keys. When the instance deploys, the script creates example_user, then moves the public SSH keys from root to example_user. Now you can SSH to the new instance as example_user with the keys you provided.