SSH通过密钥登入.md

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• 在服务端生成密钥对：ssh-keygen -t rsa

[root@twx ~]# ssh-keygen -t rsa
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:
2d:34:ba:cc:f1:1e:8b:80:56:1e:6f:9d:37:8f:64:8d root@twx
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|        o        |
|       o o       |
|    o o S .      |
|   + = = o o     |
|  o o * = E .    |
| .   o o * +     |
|      . o . .    |
+-----------------+

生成的密钥对在/root/.ssh/文件夹下。

• 将公钥文件输出到 一个特定的文件里（见步骤3里的文件名）：cat id_rsa.pub > authorized_keys

-rw------- 1 root root  390 Jul 25 04:38 authorized_keys
-rw------- 1 root root 1675 Jul 25 04:37 id_rsa
-rw-r--r-- 1 root root  390 Jul 25 04:37 id_rsa.pub

• 修改文件权限

chmod 600 authorized_keys
chmod 700 ~/.ssh

• 修改ssh配置文件：vim /etc/ssh/sshd_config
  修改下面三行

RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile      .ssh/authorized_keys  #（注意这个文件名）

退出保存

• 重启ssh服务：service sshd restart

-------至此，服务端已经配置好了-------------------

putty

1. 通过ftp工具把/root/.ssh/id_rsa文件下载到本地
2. 打开puttygen.exe,点击Load,选择id_rsa,然后另存为putty格式的密钥
3. 打开putty,点击SSH-Auth–选择加载private key

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