ssh无密码登陆服务器配置实例

发布时间:2020-12-17编辑:脚本学堂
本文介绍了linux下ssh无密码登录的配置方法,感兴趣的朋友可以参考下。

两台服务器,内网ip分别是:
172.16.3.91 (本地机)
172.16.3.92 (远程机)
现在想在本地机上通过ssh 172.16.3.92登陆到远程机而不需要密码。

1.在本地机上用ssh-keygen 创建公钥私钥。
 

复制代码 代码示例:
[root@rs-1 ~]# 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:
dc:fc:ea:b8:bb:74:d7:75:4b:6a:27:82:28:27:be:d6 root@rs-1

这个过程会提示输入密码,记住直接按回车就行,不要输入密码!要是输入了密码,一会访问的时候就需要输入密码了。

创建之后能看到如下两个文件
 

复制代码 代码示例:
[root@rs-1 .ssh]# ll
total 24
-rw------- 1 root root 1675 May  8 07:18 id_rsa
-rw-r--r-- 1 root root  391 May  8 07:18 id_rsa.pub

id_rsa是私钥
id_rsa.pub是公钥, 主要给远程机使用的

2.把公钥传到远程机上去。
 

复制代码 代码示例:
[root@rs-1 .ssh]# scp id_rsa.pub root@172.16.3.92:~/.ssh/authorized_keys
Address 172.16.3.92 maps to localhost, but this does not map back to the address - POSSIBLE break-IN ATTEMPT!
root@172.16.3.92's password:
id_rsa.pub  100%  391     0.4KB/s   00:00 

3.ssh链接时候就不需要密码了,直接登陆到远程机
 

复制代码 代码示例:
[root@rs-1 .ssh]# ssh 172.16.3.92
Address 172.16.3.92 maps to localhost, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
Last login: Thu May  8 07:19:28 2014 from 172.16.3.91