Add user and ssh login settings

1、root@ubuntu:~# adduser kyle

    root@ubuntu:~# passwd kyle #Set password for kyle user

 

2. Add users to groups 

      root@ubuntu:~# usermod -G wheel kyle #Add the user to the group

      root@ubuntu:~# groups kyle #View user group information

 

3. Remove the user from the group

Edit /etc/group to find the GROUP1 line and delete kyle

or with the command

gpasswd -d kyle  wheel

 

4. View the relevant configuration of SUDO

     root@ubuntu:~# visudo /etc/sudoers #查看

 

5. Edit the configuration file /etc/ssh/sshd_config

RSAAuthentication yes

PubkeyAuthentication yes

AuthorizedKeysFile .ssh/authorized_keys (this is the reason for changing the name later)

PasswordAuthentication no (closes the regular password login method, which transmits passwords in clear text)

 

6. Remember to restart the ssh service

  root@ubuntu:~# service sshd restart or /etc/rc.d/init.d/sshd restart