A minimal install of RedHat 7.x does not enable the network by default (network interfaces are enabled when you login to the GUI bu the network manager – which doesn’t work if there is no GUI).

The available network interfaces may be detected but will not be assigned an IP address.

To enable networking you need login on the console as root and update the system network configuration.

Add or change the line shown below to enable the network.

Then you need to create a config file for each interface, however you need to remember that the name of the config file depends on the interface name which in this case is ens33.

On recent versions of RedHat the network interface may be called something like enp2s0 or even enp1s0f1 (if you prefer to use the old naming then you can turn off the BIOS enumeration of device names).

If you want to use DHCP then you just need the following settings. If you are have installed the network manager then you need to include NM_CONTROLLED=no otherwise these settings will be ignored.

Or if you want to use a static address.

Then you should be able to bring the interface up.