SSH login without passwords
SSH Private-Public Key Pair Login Everyone would agree with the fact that SSH is the most widely used remote access protocol used in Linux based operating systems. The primary reason behind the popularity of SSH is, it utilizes one way encryption, supports many encryption algorithms as well as pre-shared keys for authentication. There are a couple of remote file sharing software that rely on SSH for protection like SCP, SFTP, RSYNC. Among them, RSYNC is really popular for taking backups. But because RSYNC to a remote host relies on SSH, and SSH prompts for a password, automating the backup process cannot be done with default settings. Here is where private-public key pair kicks in to save the day. With the help of the key pair, it is possible to utilize SSH to a remote host without using passwords. The methodology is pretty simple. HostA generates a private and public key pair. While generating the pair, no passphrases are used because the objective is to enable SSH wit...