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You may have read about using ssh, SCP, and rsync, but they all require a password, which is understandable due to security. By the way … this is not recommended for a business environment. However, there are times when you have to do this in cron, so you have to do it without intervention. First, use ssh-keygen on the local server to generate public and private keys. Note: When you are asked to enter the password, just press the Enter key and do not provide any password here.
Suppose you want to copy between two hosts host_src and host_dest. host_src is the host where you would run the scp, ssh, or rsyn command, regardless of the direction of the file copy.
- On host_src, run this command as the user running scp / ssh / rsync $ ssh-keygen -t rsa This will prompt for a passphrase. Just hit the Enter key. Then it will generate an id (private key) and a public key. Never share the private key with anyone! ssh-keygen shows where you saved the public key. This is by default ~ / .ssh / id_rsa.pub: Your public key has been saved in
- Transfer the id_rsa.pub file to host_dest by ftp, scp, rsync or any other method.
- At host_dest, log in as the remote user you plan to use when running scp, ssh, or rsync on host_src.
- Copy the contents of id_rsa.pub to ~ / .ssh / allowed_keys
$ cat id_rsa.pub >> ~ / .ssh / allowed_keys $ chmod 700 ~ / .ssh / allowed_keys If this file does not exist, the above command will create it. Make sure to remove permission for others to read this file. If it is a public key, why prevent others from reading this file? The key owner has probably distributed it to a few relying parties and has not put in place any additional security measures to check whether it is actually a relying party.
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