How to set Static IP in Ubuntu Server

1 - sudo -i ( for super user and not use sudo before every command)

2 - vi /etc/network/interfaces

3 - iface eth0 inet static

        address 192.168.1.100

        netmask 255.255.255.0

        network 192.168.1.0

        broadcast 192.168.1.255

        gateway 192.168.1.1
        dns-nameservers 8.8.8.8
               

4 - save and exit

5 - service networking restart