ECS Linux 服务器公钥秘钥SSH登录

Ubuntu 14.04.1为例，设置步骤如下：

一. 生成密钥的公钥和私钥

1. # ssh-keygen -t rsa 
2. 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): #输入密码

   Enter same passphrase again:                #输入密码

   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:

                 1c:37:a8:a3:65:a2:4a:89:ab:46:30:ad:54:d1:40:eb root@iZ28vo50eu5Z

二. 将生成的私钥（id_rsa）下载到本地的windows机器上，并把公钥导入到.ssh/authorized_keys 文件中去

#  cd /root/.ssh/

1. #cat id_rsa.pub > authorized_keys 

三. 设置sshd  服务器服务，打开以下设置：

1. RSAAuthentication yes 
2. PubkeyAuthentication yes

1. AuthorizedKeysFile      /root/.ssh/authorized_keys 
2.  修改以下设置： 
3. ChallengeResponseAuthentication no 
4. PasswordAuthentication no 
5. UsePAM no 

四. 重启ssh服务

1. #service ssh  restart 

五. 导入私钥到远程工具中，比如xshell。

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