Linux免密登陆

[root@bogon .ssh]# ssh-keygen -t rsa
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:U+He9vxeISDtG2nT5EZULBNrQAJtn4b2HUcFX3Gi7bg root@bogon
The key's randomart image is:
+---[RSA 2048]----+
|       .o.oo o*+*|
|         +o.o=.=o|
|        ..=oo== .|
|         =o=O+ . |
|        S +*==+. |
|         ..o==. .|
|           .E o .|
|               ..|
|               .o|
+----[SHA256]-----+

* id_rsa : 生成的私钥文件 *
* id_rsa.pub ： 生成的公钥文件*

[root@bogon .ssh]# ssh 192.168.1.65
The authenticity of host '192.168.1.65 (192.168.1.65)' can't be established.
ECDSA key fingerprint is SHA256:JHXcH2MD3f7NaTDe0FGeC8liVsJwD+LuOSWgjXI9Pzo.
ECDSA key fingerprint is MD5:48:55:78:07:c9:d2:0b:5b:74:cc:e1:71:6e:5e:eb:f1.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.65' (ECDSA) to the list of known hosts.
Last login: Tue Aug  4 14:22:50 2020 from 192.168.1.89

[root@bogon .ssh]# ssh 192.168.1.65
Last login: Tue Aug  4 14:32:40 2020 from 192.168.1.89