（2.3）ssh-copy-id三步实现SSH无密码登录

第一步:在本地机器上使用ssh-keygen产生公钥私钥对

$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/daodao/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/chengang/.ssh/id_rsa.
Your public key has been saved in /home/chengang/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:RymhT9wC+nuQHe9v6e9rSAUYQIxKuKbrEF1tAVWGiwY chengang@chengang-vm
The key's randomart image is:
+---[RSA 2048]----+
|   ..o+**..o     |
|  E .oo*.o...    |
|   +oo+.* +  .   |
| .o.+o.= *    .  |
|.o..  + S o  .   |
|..     o o  .    |
|..    . . .. o   |
|o      .   .+ .  |
|..         oo++. |
+----[SHA256]-----+

第二步:用ssh-copy-id将公钥复制到远程机器中

ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

 注意有一个要输目标节点密码的环节：

 

注意：.ssh是一个隐藏文件。显示隐藏文件 ls -a 或者 ll -a

 

第三步: 登录到远程机器不用输入密码

ssh [email protected]