How to Generate an SSH Key on macOS for Accessing a VPS Ubuntu

[MyrinNew]

Step 1: Generate an SSH Key

1. Open the Terminal on your macOS.
2. Run the following command to generate a new SSH key:

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

• -t rsa: Specifies the type of key (RSA).
• -b 4096: Defines the key size (4096 bits).
• -C "your_email@example.com": Adds a comment to the key (usually your email).
  1. When prompted, specify the file name for the key. Press Enter to use the default path.
  2. You can add a passphrase to the key for extra security or leave it blank by pressing Enter.

Step 2: View the Public Key

Your public SSH key is stored at:






~/.ssh/id_rsa.pub







To view the public key, use:






cat ~/.ssh/id_rsa.pub







Copy the public key.





Step 3: Add the Public Key to Your VPS

1. Connect to your VPS manually using a password:

ssh username@server_ip

1. On the VPS, open or create the authorized_keys file:

mkdir -p ~/.ssh
nano ~/.ssh/authorized_keys

1. Paste the public key you copied into the file.
2. Save and exit the editor.
3. Set the appropriate permissions for the file and directory:

chmod 600 ~/.ssh/authorized_keys
chmod 700 ~/.ssh










Step 4: Test Password-Free Access

On your macOS, test the SSH connection without a password:






ssh username@server_ip










Step 5: Optional Configuration

To simplify SSH access, you can configure the ~/.ssh/config file:






nano ~/.ssh/config







Add the following:






Host my-vps
HostName server_ip
User username
IdentityFile ~/.ssh/id_rsa







Now you can connect using:






ssh my-vps










Conclusion

By following these steps, you can securely and conveniently access your VPS without needing to enter a password every time. This method enhances both security and efficiency in server management.




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