[root@rhel7 ~]# ssh-keygen  --在客户端主机中生成“密钥对”

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:

:ed::f4:f6:dc::0e:9a:6c::b0:f5:2e:: root@rhel7.rusky.com

The key's randomart image is:

+--[ RSA ]----+

|E.o .            |

|.+ + . o         |

|+ . + = +        |

| o o * * +       |

|  . * . S .      |

|   o   . .       |

|                 |

|                 |

|                 |

+-----------------+

[root@rhel7 ~]# ssh-copy-id 192.168.1.8  --把公钥传送到远程服务器中

The authenticity of host '192.168.1.8 (192.168.1.8)' can't be established.

ECDSA key fingerprint is :b8:f6:7c:::bb::7d:3e::6a::a0:c1:e2.

Are you sure you want to continue connecting (yes/no)? yes

/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:  key(s) remain to be installed -- if you are prompted now it is to install the new keys

root@192.168.1.8's password: 

Number of key(s) added: 

Now try logging into the machine, with:   "ssh '192.168.1.8'"

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

[root@rhel7 ~]# ssh 192.168.1.8  --在客户端主机尝试登陆到服务端主机，此时无需输入密码口令也可直接验证登陆成功

Last login: Sun Aug   ::  from 192.168.1.99

[root@victory ~]# 

# To disable tunneled clear text passwords, change to no here!

PasswordAuthentication no

#PermitEmptyPasswords no

#PasswordAuthentication yes