Smb & nmb not starting at boot - CentOS7

I would like the smb and nmb to start on boot.

In the terminal (as root) I did:

/sbin/chkconfig smb --add

or

chkconfig --add samba

or

chkconfig --add /sbin/smbd

resault is message like below :

error reading information on service smb: No such file or directory

Centos7 uses systemd . Have a look at man systemctl, specifically systemctl enable ...
chkconfig is stiil used, but just for a few remaining applications that still use init scripts...

You only need this command with both services.

systemctl enable smb nmb