ssh-keygen -t rsa

 

[root@localhost ~]# ssh-keygen -t rsa

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa): 

Created directory '/root/.ssh'.

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:

SHA256:PeMmQH0e2HL+jxZjYJ6/8Hej+ANJ06gm+sUIhzCLNho root@localhost

The key's randomart image is:

+---[RSA 3072]----+

|                 |

|       . o       |

|   o  . + = o    |

|  . +..  Bo= .   |

|E+ . o..SoOoo    |

|o..   ooo+o*+    |

|.     ..+o+ooo   |

|     .  .o o++...|

|      ..   o==+..|

+----[SHA256]-----+

[root@localhost ~]# 

 

进入主机A ~/.ssh/ 目录，会发现生成了一对密钥

Your identification has been saved in /home/test/.ssh/id_rsa.

Your public key has been saved in /home/test/.ssh/id_rsa.pub.

 

### A将公钥文件中的内容复制到 ==> 远程服务器端B

~/.ssh/id_rsa.pub

~/.ssh/authorized_keys

 

## 步骤如下

[root@localhost .ssh]# pwd

/root/.ssh

[root@localhost .ssh]# ll

total 12

-rw------- 1 root root 891 Jun  1 14:52 id_rsa

-rw-r--r-- 1 root root 228 Jun  1 14:52 id_rsa.pub

-rw-r--r-- 1 root root 172 Jun  1 22:28 known_hosts

[root@localhost .ssh]# vi /root/.ssh/authorized_keys

 

### 粘贴id_rsa.pub内的字符串到这个文件,对于OpenSSH来说，我们需要将公钥加入到~/.ssh/authorized_keys中。每个公钥一行，千万注意不要换行，否则可能不能正常工作。

### 修改文件权限

chmod 600 /root/.ssh/authorized_keys

 

 

### 修改/etc/ssh/sshd_config 文件

修改/etc/ssh/sshd_config 文件，将RSAAuthentication 和 PubkeyAuthentication 后面的值都改成yes

将PasswordAuthentication yes 修改成 PasswordAuthentication no

 

### 重启SSHD

/etc/init.d/sshd restart