Linux Container Static IP address Assignment

lxc-static-ip.sh

#!/bin/bash
# Script by Brian Tissue
# Used to assign static IP addresses to LXC containers

LXCPATH='/var/lib/lxc'

if [ "$(whoami)" != "root" ]; then
echo "Not running as root. I told you that you needed to be root, come on man..."
echo "Please use su -s then run this script again as root."
exit 0
else
echo "Running as root. Good"
fi

echo "View Existing Configured Containers? [Y,n]"
read input
if [[ $input == "Y" || $input == "y" ]]; then
        ls -latrh "$LXCPATH"
else
        echo "Ok, I guess you don't want to check yourself...."
fi

echo "View this hosts current IP address scheme? [Y,n]"
read input
if [[ $input == "Y" || $input == "y" ]]; then
        ifconfig
	echo "This Host's Current Default Gateway:"
	ip route ls | grep -i default
else
        echo "Ok, I guess you don't want to check yourself...."
fi

echo "-----------------------------------------------------/"
echo
echo "Okay, let's begin to configure the static IP addresses."
echo
echo "-----------------------------------------------------/"

read -p "Enter the container name: " cnname
read -p "Enter Static IP address: " cnipaddress
read -p "Enter Static Subnet Mask: " cnsubnetmask
read -p "Enter Default Gateway: " cndefaultgateway
read -p "Enter DNS Name Server: " cnnameserver

echo "-----------------------------------------------------/"
echo
echo "Let's look the current configuration cntrl+c if you need to quit"
echo
echo "-----------------------------------------------------/"

cat "$LXCPATH"/$cnname/rootfs/etc/network/interfaces

echo "Creating a backup of the original interface configuration for $cnname"

sleep 5

if [ -f "$LXCPATH"/$cnname/rootfs/etc/network/interfaces/*.bak ]
then
    echo "Removing current bakup file of interfaces"
    rm -rf "$LXCPATH"/$cnname/rootfs/etc/network/interfaces/*.bak
else
    echo "Creating Backup Now"
    cp -r "$LXCPATH"/$cnname/rootfs/etc/network/interfaces "$LXCPATH"/$cnname/rootfs/etc/network/interfaces.bak
fi

echo "-----------------------------------------------------/"
echo
echo "Backup file is located at: $cnname/rootfs/etc/network"
echo
echo "-----------------------------------------------------/"

sleep 5

> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces

echo "auto lo" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
echo "iface lo inet loopback" >> "$LXCPATH"/$cnname/rootfs/et c/network/interfaces
echo "auto eth0" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
echo "iface eth0 inet static" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
echo "address $cnipaddress" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
echo "netmask $cnsubnetmask" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
echo "gateway $cndefaultgateway" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
echo "dns-nameserver $cnnameserver" >> "$LXCPATH"/$cnname/rootfs/etc/network/interfaces

echo "View $cnname new IP address scheme? [Y,n]"
read input
if [[ $input == "Y" || $input == "y" ]]; then
        cat "$LXCPATH"/$cnname/rootfs/etc/network/interfaces
else
        echo "Ok, I guess you don't want to check yourself...."
fi

echo "Power on $cnname? [Y,n]"
read input
if [[ $input == "Y" || $input == "y" ]]; then
        lxc-start -n $cnname
	sleep 2
	lxc-ls -f
else
        echo "Exiting Script..."
	exit 0
fi