ssh-copy-id帮你建立信任

[nameA@machineA]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/nameA/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/nameA/.ssh/id_rsa.
Your public key has been saved in /home/nameA/.ssh/id_rsa.pub.
The key fingerprint is:
bb:3b:14:be:5d:45:ab:72:27:ec:93:21:c6:a3:7d:77 nameA@machineA
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|                 |
|        .   .    |
|       .X. o .   |
|       .o.  +    |
|       .*+.o     |
|       +++C+o E  |
|      . +C++ .   |
+-----------------+