Static IP on CentOS 7: how to configure it?

Static IP on CentOS 7 machine network interface

There are several ways to configure a static IP address on a network interface in CentOS 7.
Whoever, private, professional or company, needed to set a static IP address, will have the following guide.

Consider connecting to a Linux CentOS 7 machine through the command line

yum install vim

we configure the network card of reference and to find it we execute

ip addr

we will have the following example result:

enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:0b:d5:2c brd ff:ff:ff:ff:ff:ff
inet 10.10.10.10/24 brd 10.10.10.255 scope global dynamic enp0s3
valid_lft 86146sec preferred_lft 86146sec
inet6 fe80::a00:27ff:fe0b:d52c/64 scope link
valid_lft forever preferred_lft forever

In this case the assignment mode is DHCP, in case we want to change to static we will modify the following file:

vim /etc/sysconfig/network-scripts/ifcfg-enp0s3

adding and modifying the following parameters:

TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s3
DEVICE=enp0s3
ONBOOT=yes

in particular we will modify:

BOOTPROTO=static

and we will add the following variables:

IPADDR=10.10.10.150
NETMASK=255.255.255.0
GATEWAY=10.10.10.254
DNS1=8.8.8.8
DNS2=8.8.4.4

once considered the example of 10.10.10.150 available for static assignment it will be possible to restart the reteli card:

ifdown enp0s3 && ifup enp0s3

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