首先登录服务器生成密钥对：
[jiucool@localhost ~]$ ssh-keygen -t rsa -f ~/.ssh/id_rsa_jiucool -C "id_rsa for jiucool.org"
Generating public/private rsa key pair.
Created directory '/home/jiucool/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/jiucool/.ssh/id_rsa_jiucool.
Your public key has been saved in /home/jiucool/.ssh/id_rsa_jiucool.pub.
The key fingerprint is:
05:f8:a8:d8:c1:01:da:03:e0:0f:14:08:23:42:b5:5a id_rsa for jiucool
The key's randomart image is:
+--[ RSA 2048]----+
|%++o .. |
|*= o . . |
|.ooE . o . |
| =.o . .. |
| . + o S |
| . o |
| |
| |
| |
+-----------------+
进入目录，我们可以看到，已经生成了一对公钥也私钥
[jiucool@localhost ~]$ cd ./.ssh
[jiucool@localhost .ssh]$ ls
id_rsa_jiucool id_rsa_jiucool.pub
[jiucool@localhost .ssh]$
接着进行，对公钥进行改名：
[jiucool@localhost .ssh]$ mv id_rsa_jiucool.pub authorized_keys
chmod 600 ./*
然后 vi 修改 配置文件 ,将如下几项值进行修改
vi /etc/ssh/sshd_config
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
PasswordAuthentication no
重启ssh服务
sudo service sshd restart
我们将上述生成的私钥文件，导入到客户端SSH中就可以使用了。
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