linux中客户端生成密钥对的方法是什么？

首先在客户端上生成密钥对

[root@localhost ~]# ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): # 直接回收保存在默认路径
Enter passphrase (empty for no passphrase): # 如果将密码留空，可以用私钥进行身份验证，登录时不需要再输入密码。如果输入密码了，需要私钥和密码才能登陆。使用密码保护密码会更加安全。
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:
SHA256:Ot1VM6XM0Cat1dm75ZWPqWx+mSNo04aHDNwqm7p0Q6k root@localhost.localdomain
The key`s randomart image is:
+---[RSA 2048]----+
|            .o .+|
|            .+=+o|
|             =B o|
|       .    .. =o|
|      o.S.  .  +=|
|     o oo...  o.o|
|    E = .+.* . o |
|   . ..+. B O =  |
|    oooo . *.o . |
+----[SHA256]-----+

# 将会在当前用户主目录中生成id_rsa私钥和id_rsa.pub公钥
[root@localhost ~]# ls /root/.ssh/
id_rsa  id_rsa.pub  known_hosts