SSH set private key for two Linux hosts without password access

Create a public and private key on the server host (called a host): Ssh-keygen-t RSA all the way back, if you want to set a passphrase, set a passphrase when prompted passphrase to view the generated public and private keys: LS ~/.ssh id_ Rsa.pub id_rsa Public key content output to the appropriate file: Cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys Delete the original public key file: Rm-f ~/.ssh/id_ Rsa.pub settings File property is set to 400:chmod ~/.ssh/authorized_keys copy the private key to another Linux host (called the B host) file placement path: ~/.ssh/id_rsa Set file access chmod 600 ~/.ssh/id_rsa in this way, from the B host login a host, you can not enter the login password, to achieve no password directly login!