Linux下制作不用密码可立即登录的SSH用户

一、客户端建立两把钥匙

(1)本例以客户端的monkey用户为例，首先切换到~/.ssh目录下，如果没有该目录的话，需要进行新建

cd ~

mkdir .ssh

chmod 700 .ssh

cd ~/.ssh

(2)执行ssh-keygen命令生成客户端的公钥和私钥

ssh-keygen

[monkey@RHEL6 .ssh]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/monkey/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/monkey/.ssh/id_rsa.
Your public key has been saved in /home/monkey/.ssh/id_rsa.pub.
The key fingerprint is:
20:08:e7:d3:59:3a:13:ae:a2:7a:ce:6f:b2:59:ec:44 monkey@RHEL6.5
The key's randomart image is:
+--[ RSA 2048]----+
|. . . .          |
| + + =           |
|  + O .          |
|   o + .         |
|. . E   S        |
|.. o             |
|.   +            |
|..o=.            |
|.o==o            |
+-----------------+

红色标记的为客户端的私钥，黄色标记的是服务端的公钥

-rw------- 1 monkey monkey 1675 7月  25 01:12 id_rsa
-rw-r--r-- 1 monkey monkey  396 7月  25 01:12 id_rsa.pub

二、将公钥文件上传到服务器上

例如，我们想登陆服务器192.168.1.100的iPanda用户，则需要将客户端的公钥上传到iPanda用户的家目录下

scp  ~/.ssh/id_rsa.pub  iPanda@192.168.1.100:/~

三、将公钥文件放置到服务器的正确目录与文件名

新建~/.ssh目录(如果没有的话)， 并追加文件到 .ssh/authorized_keys中

mkdir .ssh

chmod 700 .ssh

将.id_rsa.pub中的数据追加到.ssh/authorized_keys文件中

cat  id_rsa.pub >>  .ssh/authorized_keys

chmod 644  .ssh/authorized_keys