Setting Up Passwordless SSH Login between a Client and Two Servers

Passwordless SSH login using SSH keys can enhance security and simplify remote access to servers. This guide will walk you through the process of generating SSH keys and configuring passwordless logins between a client and two servers.

Step 1: Generate SSH Key Pair on the Client Machine

Open a terminal on the client machine and run the following command:

ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_client -C "[email protected]"

Step 2: Copy the Public Key to the Servers

Replace <username> and <server1_hostname> with your username and the hostname or IP address of the first server:

ssh-copy-id -i ~/.ssh/id_ed25519_client.pub <username>@<server1_hostname>

Repeat the process for the second server:

ssh-copy-id -i ~/.ssh/id_ed25519_client.pub <username>@<server2_hostname>

Alternatively, you can manually add the public key to ~/.ssh/authorized_keys on each server.

Step 3: SSH Configuration on the Client

Edit the SSH config file on the client:

nano ~/.ssh/config

Add the following lines:

Host server1

HostName <server1_hostname>

User <server1_username>

IdentityFile ~/.ssh/id_ed25519_client

Host server2

HostName <server2_hostname>

User <server2_username>

IdentityFile ~/.ssh/id_ed25519_client

Save and exit.

Step 4: Test SSH Connection

You should now be able to connect to each server without entering a password:

ssh server1

ssh server2

Replace <server1_hostname>, <server1_username>, <server2_hostname>, and <server2_username> with the actual values for each server.

Congratulations! You have successfully set up passwordless SSH login between your client and two servers.

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