Access the remote host through SSH to Establish a trust relationship

SSH remote control is often used. After a trust relationship is established, you can achieve password-less access. After hostname is set, you can avoid the trouble of entering an IP address. The procedure is as follows:
1, Ssh-keygen-B 1024-T RSA, there are several options for you to enter the private key, just enter It is in ~ Several files are generated under/. Ssh/, one of which is Id_dsa.pub, which is the public key that generates host. 2. Copy It To The ~ of host B ~ /. Ssh, and The name of authorized_keys is saved. SCP id_rsa.pub user @ IP:/home/QW/. Ssh/authorized_keys 3. In this way, host B can access a without a password. 4. Modify the/etc/hosts file in B and add host a hostname to correspond to the IP address. Then SSH can be used to access a with hostname.