How to configure the ssh service so that you can connect to the remote host without entering the account password-linux operation and maintenance

We know that the ssh protocol can connect to a remote server by entering the account name and password. So, can you log in directly without entering the account number and password? The answer is yes, and in daily work, this requirement is also common. For example, if you use scp to do remote backup, and want to write scp into crontab, but you must not be able to enter the account password in crontab, then you need to log in without account password. ssh is an asymmetric encryption protocol with public and private keys. The public key is used to encrypt information. Each host will store the public keys of other hosts in the known_hosts file under the .ssh directory of its own home directory. If you want to do account-free password, the key point is this public key. Suppose a server host SERVER, a client CLIENT, the client wants to connect to SERVER without login. Then just append the client’s public key to the end of ~/.ssh/authorized_keys of the SERVER machine. The following two situations demonstrate how to log in without a password: The client is a windows system The client is a linux system The client is…