SSH Configurations RHEL (Redhat Linux) -Command Line

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 SSH (Secure Shell) :-

=>It is a protocol which facilitates secure communications between two systems using a client-server architecture and allows users to log in to server host systems remotely.

=>Unlike other remote communication protocols, such as FTP or Telnet, SSH encrypts the login session, rendering the connection difficult for intruders to collect encrypted passwords.

=>SSH Protocol was developed in 1995 by Tatu Ylonen, Finland.

=>Packages:- openssh

=>Port Number:- TCP 22 (Default Port)

=>Main Config File:- /etc/ssh/sshd_config

=>Daemon Name:- sshd

 SSH CONFIGURATION FILES :-

=>sshd_config - The configuration file for the sshd daemon.

=>sshd_host_dsa_key - The dsa private key used by the sshd daemon.

=>authorised_key - This file holds a list of authorized public key for Servers. When the Client connect to a server, the server authenticates the Client by checking its signed public key stored within this file.

=>id_dsa - Contains the DSA private key of the user.

=>id_dsa.pub - The dsa public key of the user.

=>id_rsa - The rsa private key used by ssh for version 2 of the SSH protocol.

=>id_rsa.pub - The rsa public key used by ssh for version 2 of SSH protocol.


 Check SSH Service :-

   #systemctl status sshd

 => If ssh is not installed, then install the ssh service in both systems (server & Client)
        #yum install openssh*

=> Check the connectivity from both Systems (Server and Client) 
        #ping 192.168.56.11
=> Goto Server create two users  Like, user1 and user2 assign password for the same.  
#useradd user1
#useradd user
=> Go To the client machine and access server users using ssh
#ssh user1@192.168.56.10 (Server IP)

   =>It Will ask you to confirmation say "yes" after that it will ask you for the password. Now your remote connection established from server user.







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