Root User remote login prohibited from CentOS/Linux

Root User remote login prohibited from CentOS/Linux

In Linux, root has almost all permissions. Once the root user password is leaked, it will be a fatal threat to the server. It is prohibited for root users to log on remotely through ssh, in this way, even if the root user password is leaked, the server security can be guaranteed.

For Linux: CentOS 6.5

1: create a common user, doiido, and add it to the corresponding group.
Note: You must create a new user. Otherwise, you will be unable to log on to the server through remote ssh.
# Groupadd doiido

# Useradd-g doiido

Change doiido Password
# Passwd doiido

2: Modify the sshd_config file
# Sed-I's/# PermitRootLogin yes/PermitRootLogin no/'/etc/ssh/sshd_config

3: restart the ssh service.
# Service sshd restart

In this way, even if the root user password is disclosed, other users cannot directly connect to the server through the root user.

Disable remote logon by the root user in Linux