Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Add multiple SSH keys to the authorized_keys file to enable SSH authentication when connecting to a server.

Step 1: Generate first ssh key Type the following command to generate your first public and private key on a local workstation. Next provide the required input or accept the defaults. Please do not change the filename and directory location.

workstation 1 $ ssh-keygen -t rsa

Finally, copy your public key to your remote server using scp

workstation 1 $ scp ~/.ssh/id_rsa.pub user@remote.server.com:.ssh/authorized_keys

Step 2: Generate next/multiple ssh key

  1. Login to 2nd workstation
  2. Download original the authorized_keys file from remote server using scp:
workstation 2 $ scp user@remote.server.com:.ssh/authorized_keys ~/.ssh
  1. Now create the new pub/private key:
workstation 2 $ ssh-keygen -t rsa
  1. Now you have new public key. APPEND this key to the downloaded authorized_keys file using cat command:
workstation 2 $ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
  1. Finally upload authorized_keys to remote server again:
workstation 2 $ scp ~/.ssh/authorized_keys user@remote.server.com:.ssh/

You can repeat step 2 for each user or workstations for remote server.

Step 3: Test your setup Now try to login from Workstation 1, 2 and so on to remote server. You should not be asked for a password:

workstation 1 $ ssh user@remote.server.com
workstation 2 $ ssh user@remote.server.com
@shivamgupta211

This comment has been minimized.

Copy link

@shivamgupta211 shivamgupta211 commented May 3, 2018

very clear article. Thanks for sharing

@timcondit

This comment has been minimized.

Copy link

@timcondit timcondit commented Nov 3, 2018

Why no attribution for the original author? @nixcraft

Howto use multiple SSH keys for password less login

@jamesdehart

This comment has been minimized.

Copy link

@jamesdehart jamesdehart commented Nov 5, 2018

Why no attribution for the original author?

Howto use multiple SSH keys for password less login

+1 @tcondit

@madhusudan12

This comment has been minimized.

Copy link

@madhusudan12 madhusudan12 commented Nov 1, 2019

How does scp work without ssh key(public key) added to .ssh/authorized_keys ? You are doing scp before the key got apppended to the server

@vadorvatsal

This comment has been minimized.

Copy link

@vadorvatsal vadorvatsal commented Sep 14, 2020

Thanks for sharing. Clear and precise answer.

@vadorvatsal

This comment has been minimized.

Copy link

@vadorvatsal vadorvatsal commented Sep 14, 2020

How does scp work without ssh key(public key) added to .ssh/authorized_keys ? You are doing scp before the key got apppended to the server

@madhusudan12 visit this link to understand how scp works https://linuxize.com/post/how-to-use-scp-command-to-securely-transfer-files/

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment