Disable Root Account in Linux for users connecting via SSH

 Testing the user login before disabling root account

[osboxes@master ~]$ ssh root@databasehost

root@databasehost's password:

Last login: Sun Feb  7 01:56:55 2021

[root@databasehost ~]#

Disable root login

[root@databasehost ~]# cp /etc/ssh/sshd_config /etc/ssh/sshd_config_bak

[root@databasehost ~]# grep ^PermitRootLogin /etc/ssh/sshd_config

PermitRootLogin yes

[root@databasehost ~]# sed -i 's/PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config

[root@databasehost ~]# grep ^PermitRootLogin /etc/ssh/sshd_config

PermitRootLogin no

[root@databasehost ~]# systemctl restart sshd

Test the ssh connection to root login to the remote system

[osboxes@master ~]$ ssh root@databasehost

root@databasehost's password:

Permission denied, please try again.

root@databasehost's password: