Establish a secret-free communication between multiple Linux hosts

Set up A Secret communication example between multiple Linux hosts: A to B set up the secret-free communication

• First step a generates a key pair

  ssh-keygen -t rsa  

-t specifies the type of secret key
RSA secret key Type

Key directory: /root/.ssh/ (if the root account, note: The key pair is not shared between different users)
Private key id_rsa
Public Key id_rsa.pub Lock

• The second step is to edit the authentication file under the host root account (other accounts)

  vi /root/.ssh/authorized_keys

  Copy the public key content generated by the previous a host id_rsa.pub to the B host authorized_keys

• The third step is to edit the SSH configuration file for Host B

  vim /etc/ssh/sshd_config

  Find the AuthorizedKeysFile %h/.ssh/authorized_keys comment to remove

• Step Fourth Restart the B host SSH service

  /etc/init.d/ssh restart

• Fifth step a host verification through

  ssh [email protected]主机ip

• If there is a C host with the B root account to establish a secret-free communication, you can directly append the generated public key to the root account of the B host authorized_keys , and then restart.

Establish a secret-free communication between multiple Linux hosts