Disabling ssh logins for the root user is an important security procedure, and is recommended by AirWave. There are 2 steps involved:
1. Add users who can ssh to the server and gain root privileges.
2. Configure the ssh daemon to not allow remote ssh logins by root.
Here's a simple process to achieve this with a user called joemontana:
1: ADD THE JOEMONTANA USER
# useradd joemontana
# passwd joemontana (you'll be prompted for a new password)
# echo "joemontana ALL=(ALL) ALL" >> /etc/sudoers
Now you should test that you can ssh to the server as joemontana and that you can become root with the "sudo su -" command:
$ sudo su -
Now enter joemontana's password. If you get a # prompt, this part was successful.
2: RECONFIGURE AND RESTART SSHD
# echo "PermitRootLogin no" >> /etc/ssh/sshd_config
# service sshd restart