How to set a static IP address on Ubuntu 14.04 server (and others)
This assumes you want to set a static IP address on the network device eth0.
Open up the interfaces file
sudo nano /etc/network/interfaces
and remove or comment out the line that says
iface eth0 inet dhcp
then add the following lines in its place:
iface eth0 inet static
address [static IP address, i.e. 192.168.1.123]
netmask [i.e. 255.255.255.0]
network [i.e. 192.168.1.0]
broadcast [i.e. 192.168.1.255]
gateway [i.e. 192.168.1.1]
dns-nameservers [i.e. 8.8.8.8]
Save the file and reboot the server. On some systems you may also need to update /etc/resolv.conf and /etc/hosts
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