General Information
Ensuring services are auto started on boot.
Example for services that are not the NIC itself:
systemctl enable httpd
To ensure the actual network interface will connect on boot (ens3 interface example):
nmcli con show ens3 | grep autoconnect # Set to yes if autoconnect is no nmcli con mod "ens3" connection.autoconnect yes
Or, edit /etc/sysconfig/network-scripts/ifcfg-ens3, to have the line:
ONBOOT=yes