SSH 免密码登录

每次登录远程服务器都要输密码！！！

事前准备

• 本地机器：local

• 远程机器：remote

实操步骤

• 本地机器生成公钥，私钥: ssh-keygen -t rsa

fengyuruhui$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/chenshan/.ssh/id_rsa): /Users/chenshan/.ssh/id_rsa_test
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/chenshan/.ssh/id_rsa_test.
Your public key has been saved in /Users/chenshan/.ssh/id_rsa_test.pub.
The key fingerprint is:
SHA256:gYV/PFrA08nktGUZ8LlFJ/Fhg7wDRjYQslmwf4UYJZc taotao@mac007
The key's randomart image is:
+---[RSA 2048]----+
|       =oXOO*o==.|
|      .oXoXE+=.+o|
|      .=.=+.+.o .|
|        o.= .=   |
|        S= o. .  |
|        . .      |
|                 |
|                 |
|                 |
+----[SHA256]-----+
fengyuruhui$ ls ~/.ssh/ | grep test
id_rsa_test
id_rsa_test.pub

• 上传本地公钥到远程机器: scp ~/.ssh/id_rsa_test.pub username@remote:.ssh/id_rsa_test.pub

fengyuruhui$  scp ~/.ssh/id_rsa_test.pub username@remote:.ssh/id_rsa_test.pub
username@remote's password:
id_rsa_test.pub 

• 在远程机器上设置 authorized_keys : cat /root/.ssh/id_rsa_test.pub >> /root/.ssh/authorized_keys