SSH uses private key to connect to server without key

General operation commands

If you want to use ssh Connection service , First, we need to generate the private key and public key , The private key is left locally , Upload the public key to the server , So when connecting , Before you can do authentication services .

At the beginning , about linux Every user on the system , Corresponding home There's one in the directory .ssh Hide directory , It is used to store the generated secret key and private key

use ssh-keygen Generate command generate secret key and public key

ssh-keygen -t rsa

Key pair generated successfully , You can see two more files ,id_rsa It's a private key file , Stay on this machine to connect to the server , id_rsa_pub Is the corresponding A public key file , Upload to the server to use

Command to log in ssh -i Private key path user name @IP Address

If you use by default .ssh Private key under There is no need to add -i Option to specify the secret key used

ssh [email protected] -i id_rsa

sshd_config Some option settings

/etc/ssh/sshd_config

Port 22  #  port 
 
# AddressFamily any
#  Listen to specific  ip  The connection of 
 
# ListenAddress 0.0.0.0
# ListenAddress ::
 
#  Whether to allow  root  User remote connection 
PermitRootLogin yes
 
#  Password authentication 
PasswordAuthentication yes

Set file permissions

chmod 0600 ~/.ssh/authorized_keys

permissions

chmod 700 /.ssh
chmod 644 /.ssh/authorized_keys  // All permissions for the public key file 
chmod 600 /.ssh/id_rsa        // All permissions for the private key file 

Report errors invalid format solve

For me, yes windows Using GlassFish Arbitrary file reading Access the private key file ed25519_key when , Copy and paste the saved key file

This may lead to more /n What? , Directly in Linux Firefox I'm going to visit , Then copy and paste , If you save it in the following format, no format error will be reported

Remember to have Line break Oh ！

SSH permision denied Possible solutions

This is mainly the pot on the service side , Don't learn ,Mark！

How to Fix SSH Failed Permission Denied (publickey,gssapi-keyex,gssapi-with-mic)

Finally everything was repaired , As a result, it was connected , Let me enter the password , I'm really convinced , It is said to be the pot of server configuration , File permissions that can be changed locally 、 The key file format has been done

ublickey)

Finally everything was repaired , As a result, it was connected , Let me enter the password , I'm really convinced , It is said to be the pot of server configuration , File permissions that can be changed locally 、 The key file format has been done

I took it SSH Password free login （ The reason why you still need to enter the password after setting and the solution