Instale CentOS 7 en su versión minimal installed CentOS 7 (x86_64) y al teclear en la terminal ifconfig me sale lo siguiente:
ifconfig command not found


Para solucionarlo volvemos a teclear en la terminal lo siguiente:
sudo yum clean all && sudo yum -y update && sudo yum install net-tools -y


Volvemos a teclear en la terminal:
ifconfig


Sale lo siguiente:
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.8 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::a00:27ff:fe0c:3495 prefixlen 64 scopeid 0x20 ether 08:00:27:0c:34:95 txqueuelen 1000 (Ethernet)
RX packets 85172 bytes 116749784 (111.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 47349 bytes 3624994 (3.4 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 0 (Local Loopback)
RX packets 8 bytes 672 (672.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8 bytes 672 (672.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Fuente: sharadchhetri.com