centos 7 command

Named services

/bin/systemctl stop  named.service
/bin/systemctl start named.service

systemctl start NetworkManager

systemctl stop NetworkManager

change network interface

nmtui

#disable root remote login 

vi /etc/ssh/sshd_config

Find this section in the file, containing the line with ¡§PermitRootLogin¡¨ in it.

#LoginGraceTime 2m

#PermitRootLogin no

#StrictModes yes

#MaxAuthTries 6

Make the line look like this to disable logging in through ssh as root.

PermitRootLogin no

Now you¡¦ll need to restart the sshd service:

/etc/init.d/sshd restart

systemctl disable firewalld