ssh 密钥连接

ssh-keygen
# 输入生成的密钥文件名
Generating public/private rsa key pair.
Enter file in which to save the key (~/.ssh/id_rsa):
# 会生成 id_rsa 和 id_rsa.pub 文件

# 输入连接的密码(此密码是用于本地用户连接而设定的, 只要使用了密钥连接服务器就默认无需再输入密码连接)
# 如果为空, 无需密码
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in ~/.ssh/id_rsa.
Your public key has been saved in ~/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:cdoRGC7IV2+vvtFzPjQAZKqun5WUIZx7Zo6dBp0spGY vm465564@root
The key's randomart image is:
+---[RSA 3072]----+
|        o++      |
|   . o +.+..     |
|    o B = =.     |
|     + B X o.    |
|    E = S . ..   |
|   o . @ o o  o  |
|      o B o o... |
|     . + . . +.  |
|    ..o   o.  .. |
+----[SHA256]-----+

ssh -p 22 username@host -i ~/.ssh/id_rsa
# 如果创建密钥的时候设定了密码, 此处需要的密码是创建密钥的时候的密码, 不是服务器密码