1.通过ssh-keygen命令生成密钥。

[root@master1 ~]# ssh-keygen  
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:

SHA256:KO5bQregq17ztbYnL4WiF1eSxjBZGCy09nqr8u665n0 root@master1

The key's randomart image is:

+---[RSA 2048]----+

|  ....=.         |

|   ..*           |

|   o. + .        |

|  . .  * .       |

|    +.+ S        |

|   +.* + .       |

|  .++.*..        |

| oo++Eo+..       |

|=*O**+.o*.       |

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

2.通过命令ssh-copy-id master2 ，输入master2密码。即可  

root@master1 ~]# ssh-copy-id master2

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"

/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

root@master2's password:  

Number of key(s) added: 1


Now try logging into the machine, with:   "ssh 'master2'"

and check to make sure that only the key(s) you wanted were added.

3.ssh master2  验证

[root@master1 ~]# ssh master2

Last login: Mon May  6 13:44:35 2024 from node1

[root@master2 ~]#