Update LXC-Container with automatical Snapshot

LXC-Container-Updatescript.md

Usage:

./lxcupdate.sh container1 container2 container3

lxcupdate.sh

#!/bin/bash
###
# Update LXC Container with automatic Snapshot
# Author: Sebastian Preisner
# Version: 0.1
# Date: 2016-07-24
###

DATE=$(date +%Y%m%dT%H%M)

function update() {
  # Check if Container is Running or not
	if [[ `lxc-info -n ${1} -s` == *"RUNNING"* ]]; then
		RUNNING=true
		echo "=== Stop running container ==="
		lxc-stop -n ${1} || { echo "lxc-stop failed"; exit 1; }
	else
		RUNNING=false
	fi

  # Create the Snapshot
	echo "=== Container Snapshot ==="
        echo "Automatical Backup ${Date}" > /tmp/snap-comm
        lxc-snapshot -n ${1} -c /tmp/snap-comm || { echo "lxc-snapshot failed"; rm /tmp/snap-comm; exit 1; }
        rm /tmp/snap-comm

  # Start Container for the Updateprocess
	echo "=== Container Start/Update ==="
	lxc-start -n $1 -d || { echo "lxc-start failed"; exit 1; }
	lxc-wait -n $1 -s 'RUNNING'
	sleep 5
	## For ArchLinux
	lxc-attach -n $1 -- pacman -Syy             
	lxc-attach -n $1 -- pacman -Suw --noconfirm 
	#lxc-attach -n $1 -- pacman -Su --noconfirm

	## For Debian based systems
	#lxc-attach -n $1 -- apt-get -qq update for Debian based systems
	#lxc-attach -n $1 -- apt-get -qq -y upgrade
	#lxc-attach -n $1 -- apt-get -qq -y clean
	#lxc-attach -n $1 -- apt-get -qq -y autoclean
	#lxc-attach -n $1 -- apt-get -qq autoremove
  
  	# Stop Container if not running on start
	if [[ ${RUNNING} == false ]]; then
		echo "=== Stop container ==="
		lxc-stop -n $1
	fi

	echo "=== Update complete ==="
}

# Function to check if container exist
function containerExist() {
	local e
	for e in `lxc-ls`; do 
            if [[ "$e" == "$1" ]]; then	
                    return 0
		fi 
	done
	return 1
}


# Loop throw the Commant
while [ $# -gt 0 ]; do
	if containerExist ${1}; then
                echo "=== Update ${1} ==="
                update ${1}
	else 
		echo "=== Container dosn't exist ==="
		echo "Container: ${1}"
	fi

	shift
done