SSH to add a trust relationship, so that SSH and SCP commands do not require password verification

Briefly describe the method:

First, run the command ssh-keygen-t sra \ on the local machine to generate the RSA key.

(This command generates a key pair: id_rsa and id_rsa.pub. They are saved in ~ by default ~ /. Ssh/directory. You can change id_rsa.pub to local_rsa.pub to avoid the same name as id_rsa.pub on the remote host. During the generation process, pass phrase is required. This is used to protect the use of the private key. That is, you must enter this password every time you use the private key, therefore, do not enter any characters here. Press enter directly .)

Copy the generated public key to the/root/. Ssh directory on the desired machine. Run the following command:
SCP id_rsa.pub peer IP Address:/root/. Ssh/authorized_keys
After SSH, SCP, and sftp access, no password is required.