ssh生成密钥

[root@master ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
cb:da:37:9f:3c:88:16:83:ce:16:4c:e2:84:9b:fc:70 root@master
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|   .             |
|  . o .          |
| . = + .S        |
|  = E +.o.       |
|   + o .o+ .     |
|    . +oo +...   |
|     ..... o+.   |
+-----------------+
[root@master ~]#

[root@master ~]# ssh-copy-id 192.168.31.129
root@192.168.31.129's password: 
Now try logging into the machine, with "ssh '192.168.31.129'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@master ~]#