使用ssh-keygen生成私钥和公钥

1.使用ssh-keygen生成私钥和公钥

命令如下：

ssh-keygen -t rsa

例子：

fdipzone@ubuntu:~$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/fdipzone/.ssh/id_rsa): 这里输入要生成的文件名 Enter passphrase (empty for no passphrase): 这里输入密码 Enter same passphrase again: 这里重复输入密码 Your identification has been saved in /home/fdipzone/.ssh/id_rsa. Your public key has been saved in /home/fdipzone/.ssh/id_rsa.pub. The key fingerprint is: f2:76:c3:6b:26:10:14:fc:43:e0:0c:4d:51:c9:a2:b0 fdipzone@ubuntu The key's randomart image is: +--[ RSA 2048]----+ | .+=*.. | | . += + | | o oo+ | | E . . o | | ..S. | | .o . | | .o + | | ...oo | | +. | +-----------------+

参数 -t rsa 表示使用rsa算法进行加密，执行后，会在/home/当前用户/.ssh目录下找到id_rsa(私钥)和id_rsa.pub(公钥)

fdipzone@ubuntu:~$ ls -lt ~/.ssh
总用量 12
-rw------- 1 fdipzone fdipzone 1679 2015-08-07 00:28 id_rsa -rw-r--r-- 1 fdipzone fdipzone 397 2015-08-07 00:28 id_rsa.pub

也可以使用 dsa 加密算法进行加密,命令如下:

ssh-keygen -t dsa

2.设定客户端连接使用的ssh私钥和公钥

vim /etc/ssh/ssh_config

找到

#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa
#   IdentityFile ~/.ssh/id_dsa

把前面#去掉，然后在 IdentityFile 后填写你用来执行ssh时所用的密钥