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🔐 Setting Up SSH Key for Secure VPS Access ​

AstroStake recommends using SSH keys instead of passwords for improved security and ease of access when managing your node infrastructure.

This guide will walk you through the process of creating and using SSH keys to access your VPS.

Prerequisites ​

Make sure you have:

  • A local machine (Linux, macOS, or Windows with WSL)
  • Access to your VPS (IP address and login credentials)

Step 1: Generate Your SSH Key ​

Run the following command on your local machine:

bash
ssh-keygen -t ed25519 -C "your_email@example.com"

Press Enter to accept the default file location (recommended), and set a passphrase if you'd like extra protection.

Your keys will be saved to:

  • Private key: ~/.ssh/id_ed25519
  • Public key: ~/.ssh/id_ed25519.pub

🧠 Never share your private key (id_ed25519) with anyone.

Step 2: Upload Your Public Key to the VPS ​

Replace username and vps_ip with your actual values:

bash
ssh-copy-id -i ~/.ssh/id_ed25519.pub username@vps_ip

If ssh-copy-id is not available, you can do it manually:

bash
cat ~/.ssh/id_ed25519.pub

Then, SSH into your VPS and paste the key into ~/.ssh/authorized_keys.

Edit your VPS SSH configuration:

bash
sudo nano /etc/ssh/sshd_config

Update this setting to disable password login:

PasswordAuthentication no

Then restart SSH:

bash
sudo systemctl restart sshd

⚠️ Make sure your SSH key is working before disabling password login.

To disable root login safely, follow this separate guide:
👉 Disable Root Login (Safely)

Step 4: Connect Using SSH Key ​

Now you can log in with your key:

bash
ssh username@vps_ip

If your key has a passphrase, you’ll be prompted to enter it.

Optional: Use SSH Config for Easier Access ​

Create or edit your SSH config file:

bash
nano ~/.ssh/config

Example entry:

Host astrovps
  HostName vps_ip
  User username
  IdentityFile ~/.ssh/id_ed25519

Now you can connect simply by running:

bash
ssh astrovps

✅ Done! ​

You’ve secured your VPS with SSH key authentication. Keep your private key safe, and consider backing it up in a secure location.

If you run into issues, feel free to reach out in our community channels or DM @AstroStake on X.

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