/etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# Source interfaces
# Please check /etc/network/interfaces.d before changing this file
# as interfaces may have been defined in /etc/network/interfaces.d
# NOTE: the primary ethernet device is defined in
# /etc/network/interfaces.d/eth0
# See LP: #1262951
source /etc/network/interfaces.d/*.cfg


# Read the dynamically created configurations from tmpfs mount. If you want a static
# configuration, disable the line below. However, you will have to manually configure
# each interface on this system. The contents of /etc/network/interfaces.dynamic.d/*.cfg
# are written over EACH boot.
#source /etc/network/interfaces.dynamic.d/*.cfg
#REQUIRED!!! TO /etc/fstab:
# CLOUD_IMG: This file was created/modified by the Cloud Image build process
# The following is used to dynamically configured additional
# NICs. Do not remove unless you know what you are doing.
#none /etc/network/interfaces.dynamic.d tmpfs   nodev,noexec,nosuid,size=64K 0 0