SSH免密登录

ssh免密登录

1.切入/root/.ssh路径下，使用 ssh-keygen获取主机key。

注：直接回车即可，无需输入任何信息。

[root@likeadmin ~/.ssh]#  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:wHcQJ9gL4yUdpYnxOnMU3HRigDkL5hT4C5itp1E0eAA root@likeadmin

The key's randomart image is:

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

|Eo ....BBB* .    |

|. = +.O+=O.o     |

| * * o+B*..      |

|o + o o=..       |

| o . .+ S        |

|o . .  +         |

| +               |

|.                |

|                 |

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

[root@likeadmin ~/.ssh]#

 

2.检查生成的key文件

[root@likeadmin ~/.ssh]# ls -l

total 12

-rw-------. 1 root root 1675 Apr  3 16:47 id_rsa

-rw-r--r--. 1 root root  396 Apr  3 16:47 id_rsa.pub

-rw-r--r--. 1 root root  177 Apr  3 16:41 known_hosts

[root@likeadmin ~/.ssh]#

 

3.使用ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.164.129生成到目标主机key。

注：192.168.164.129为目标主机IP。

[root@likeadmin ~/.ssh]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.164.129

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

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

/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@192.168.164.129's password:    注：此次输入目标主机root密码。

 

Number of key(s) added: 1

 

Now try logging into the machine, with:   "ssh 'root@192.168.164.129'"

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

 

[root@likeadmin ~/.ssh]#

 

4.测试到ssh免密到目标主机

[root@likeadmin ~/.ssh]# ssh 192.168.164.129

Last login: Tue Apr  2 16:21:12 2019

[root@likenode ~]#

[root@likenode ~]# hostname

likenode

[root@likenode ~]# exit

[root@likeadmin ~/.ssh]#