SSH 设置免密登录

生成本机的 SSH 公钥

$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/xxx/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/xxx/.ssh/id_rsa.
Your public key has been saved in /home/xxx/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:WZPLsTKhNoeqzL6lCBhG1XaHvQw2dCiTO5uvXHm5HLU xxx@300-15isk
The key's randomart image is:
+---[RSA 2048]----+
|   .. o.+.       |
|  .  * B.o .     |
| .  . * * *      |
|.    o o B =     |
|..    O S +.     |
|o.   = o.oo .    |
|o   o .o + E     |
|.+ +. ..o o      |
|..B. o.  o       |
+----[SHA256]-----+
$ cat ~/.ssh/id_rsa.pub 
ssh-rsa ... xxx@xxx

将公钥内容拷贝追加到远程机器的指定文件中

ssh xx@xx
cd ~/.ssh
echo '公钥内容' >> ./authorized_keys

（本文完）