ssh免密码登录

生成秘钥

$ ssh-keygen.exe
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/17982/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /c/Users/17982/.ssh/id_rsa.
Your public key has been saved in /c/Users/17982/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:sNyM89sJWZx/wsdoa6aJYHM5ySAyEEagW0L4 1782@DESKTOP-4FR0RKP
The key's randomart image is:
+---[RSA 3072]----+
|==o . oo         |
|.o.. o.+.        |
|+.* o.=          |
|o=.= +.B         |
|+ o.o B.S        |
|o+E= o+= +       |
|..o.*=  + o      |
|  . o.   .       |
|                 |
+----[SHA256]-----+

将公钥上传到服务器

$ ssh-copy-id zxc@zhangxuechao.top
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/c/Users/17982/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
zxc@zhangxuechao.top's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'zxc@zhangxuechao.top'"
and check to make sure that only the key(s) you wanted were added.

注意：上传给哪个用户，哪个用户才可以免密