Linux SSH密钥创建

1.创建密钥

ssh-keygen -t rsa -b 4096
#执行创建命令，-b参数为指定密钥长度
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
#设置密钥密码，可以直接回车跳过
Enter same passphrase again: 
#确认密码，可以直接回车跳过
Your identification has been saved in /home/user/.ssh/id_rsa.
#公钥
Your public key has been saved in /home/user/.ssh/id_rsa.pub.
#私钥
The key fingerprint is:
SHA256:B25KhIK5xNfR3j7SBi52+e2Z+t0K7Ouhg3IzRqxyuEE pi@Debian
The key's randomart image is:
+---[RSA 4096]----+
|     ..          |
|.o  ....         |
|oo....o o        |
|.... . + o       |
|.  E  + S .      |
|  .  + X *.      |
|   .o * = o+     |
|   o.+ * oo.* .  |
|   .+ + oo*O.o.. |
+----[SHA256]-----+

2.生成authorized_keys

cd
cd .ssh/
cat id_rsa.pub >> authorized_keys

3.修改权限

1.修改权限

chmod 700 .ssh

chmod 600 .ssh/authorized_keys

4.修改ssh的配置文件

vi /etc/ssh/sshd_config

# 允许root登录，但是禁止root密码登录
PermitRootLogin prohibit-password
 
# 通过RSA认证
RSAAuthentication yes
 
# 允许pubKey（id_rsa.pub）登录
PubkeyAuthentication yes

#使用密码  no为不使用密码
PasswordAuthentication yes