ssh 公钥认证

[grid @busrac1~]$ ssh-keygen -t rsa		//一路回车
[grid @busrac1~]$ ssh-keygen -t dsa
[grid @busrac1~]$ cd .ssh
[grid @busrac1.ssh]$ cat *.pub >authorized_keys


[oracle@oadb ~]$  ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_rsa): 
Created directory '/home/oracle/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/oracle/.ssh/id_rsa.
Your public key has been saved in /home/oracle/.ssh/id_rsa.pub.
The key fingerprint is:
ef:6a:a8:00:71:54:bc:cd:38:bc:e9:cf:ab:b7:bb:32 oracle@oadb
The key's randomart image is:
+--[ RSA 2048]----+
|  .o.            |
| .  .            |
|. .. =           |
| o  = o          |
|.    +  S        |
| .  o    .       |
|  ..   .  .      |
|   .E.o ..       |
|    oBB*...      |
+-----------------+
[oracle@oadb ~]$ 
[oracle@oadb ~]$ cd .ssh/
[oracle@oadb .ssh]$ ls
id_rsa  id_rsa.pub

[oracle@oadb ~]$ ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_dsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/oracle/.ssh/id_dsa.
Your public key has been saved in /home/oracle/.ssh/id_dsa.pub.
The key fingerprint is:
46:58:d0:10:41:d4:2e:c1:1e:8a:f1:e8:26:b2:36:c7 oracle@oadb
The key's randomart image is:
+--[ DSA 1024]----+
|     +BB.        |
|  .   +oo        |
|   = o.+.        |
|  o o o..        |
| .     .S        |
|o o    .         |
|.+.              |
|.o E             |
|. o              |
+-----------------+
[oracle@oadb ~]$ cd .ssh/
[oracle@oadb .ssh]$ ls
id_dsa  id_dsa.pub  id_rsa  id_rsa.pub
[oracle@oadb .ssh]$ ls -ltr
total 16
-rw-r--r-- 1 oracle dba  393 May 13 13:23 id_rsa.pub
-rw------- 1 oracle dba 1675 May 13 13:23 id_rsa
-rw-r--r-- 1 oracle dba  601 May 13 13:24 id_dsa.pub
-rw------- 1 oracle dba  668 May 13 13:24 id_dsa
[oracle@oadb .ssh]$ 

 ssh-keygen -t rsa	 生成id_rsa  id_rsa.pub
 
  ssh-keygen -t dsa  生成id_dsa  id_dsa.pub
  
  cat *.pub >authorized_keys
  
  公钥其实就是id_rsa.pub
  
  
  公匙是被放在 ~/.ssh/authorized_keys 这个文件中
  
  
  id_rsa叫私钥，也就是钥匙，id_rsa.pub叫公钥。