Step 2: Setting up public key ssh authentication
Your mirror server will need to use public key ssh authentication to talk to your production server. To set this up, you will need to ssh into your mirror server and enter the following commands:

1. Create your public and private key pair by typing: ssh-keygen -t dsa and press Enter.
2. The key generator will ask you where you want to save your key. Press Enter to accept the default.
3. Next, the generator will prompt you to enter a passphrase. Press Enter without entering a passphrase. (You must leave this blank to allow for the automated tasks we will setup in steps 3 and 4.)
4. Finally, you will need to copy your public key to your production server. Do this by entering the following command (you will need to enter your password just this one time after you press Enter):
   • cat ~/.ssh/id_dsa.pub | ssh user@serverIP “cat - >> ~/.ssh/authorized_keys”
     user = the username of your production server
     serverIP = the IP address of your production server

Finally, you can test your setup by entering: ssh user@serverIP. If you’ve set this up correctly, you shouldn’t have to enter any login details, and now you are ready for Step 3: Using Rsync to mirror data between servers.

If you need further assistance setting up public key authentication, the steps listed above were gleaned from this post at LinuxQuestions.org.

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