ssh-keygen命令 – 生成SSH密钥文件

ssh-keygen命令来自英文词组SSH key generate的缩写，其功能是生成SSH密钥文件。ssh-keygen命令能够对SSH密钥文件进行生成、管理、转换等工作，支持RSA和DSA两种密钥格式。

语法格式：ssh-keygen 参数 对象

常用参数：

参考示例

创建一个SSH密钥文件：

[root@linuxcool ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 直接回车，以默认路径保存 Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 直接回车，不额外设置密钥密码
Enter same passphrase again: 直接回车，确认不额外设置密钥密码
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:
SHA256:tUB6SjLnvqM7p2l+bmHUZGNqUyyOPmXGyiMp3tC9xNA root@linuxcool.com
The key's randomart image is:
+---[RSA 2048]----+
|         ..      |
|        .oB      |
|      +++Oo.. 	  |
|     ..E@o.o .	  |
| .++Bo.S . 	  |
|..o.*=o 	  |
|..o..+o. 	  |
|   . .oo=.  	  |
|     o*Xo. 	  |
+----[SHA256]-----+

手动指定加密格式并添加注释信息，创建一个SSH密钥文件

[root@linuxcool ~]# ssh-keygen -t rsa -C "welcome to linuxcool.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 直接回车，以默认路径保存
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 直接回车，不额外设置密钥密码
Enter same passphrase again: 直接回车，确认不额外设置密钥密码
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:
SHA256:OQodor0B83DoxbFOY+KUo0swrQAgo8tL3qIHA0t40gQ welcome to linuxcool.com
The key's randomart image is:
+---[RSA 2048]----+
|E.  .            |
|+o.+ o           |
|*o@ X .          |
|BXo/ + . .       |
|*B+ * . S        |
|B.o  + . .       |
|.* .. .          |
|. o              |
|..               |
+----[SHA256]-----+