Ssh authentication

To set up password-less SSH authentication from the thor user on the jump host to all app servers via their respective sudo users, follow these steps:

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Step 1: Generate SSH Key on Jump Host

Log in as thor on the jump host and generate an SSH key pair:

ssh-keygen -t rsa -b 4096

• Press Enter for the default location (~/.ssh/id_rsa).
• Leave the passphrase empty for password-less access.

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Step 2: Copy the Public Key to Each App Server

For each server, copy thor's public key to the corresponding sudo user (e.g., username for appserver):

ssh-copy-id username@app-server1
ssh-copy-id username@app-server2
ssh-copy-id bruce@app-server3

Replace username, username, bruce with the respective sudo usernames and app-serverX with actual server names or IPs.

If ssh-copy-id isn’t available, manually copy the key:

cat ~/.ssh/id_rsa.pub | ssh username@app-server1 'mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys'

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Step 3: Verify Password-less Login

Test by running:

ssh username@app-server1

If it logs in without a password, authentication is working.

Repeat for other servers:

ssh username@app-server2
ssh bruce@app-server3

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Step 4: Restrict Root Access (Optional for Security)

Prevent password login in /etc/ssh/sshd_config:

PermitRootLogin no
PasswordAuthentication no

Then restart SSH:

sudo systemctl restart sshd

Now thor can access all app servers without needing a password, ensuring smooth automation for scripts. 🚀 Let me know if you need modifications!