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#!/bin/bash
#####################################################################
#
# A FOOLISH KVM BACKUP SCRIPT
# hacked together by Miguel<m.i@gmx.at> around mid February 2018
#
# DO NOT FORGET TO SYNC & FSTRIM YOUR DISK BEFORE RUNNING THIS SHIT
# untar also needs -S !!!
#
# TODO: ADD TIMING INFO ?
#
# TODO: do not make so many assumptions about file names and locations :(
# This script should/could be much more universal!
# Do some BASIC error checking
# An RESTORE script would be very helpfull as well
#
# TODO!: check if we run inside tmux
# ask if fstrim performed
# check/ask for sudo
# config external backup space
# show config and ask if ok
# override --all-yes with param
# use dash instead bash
# dry run
#
#####################################################################
VERSION="0.1"
# we exit as soon as a single command fails!
set -e
echo ""
echo " 1) Are you running inside a tmux/screen?"
echo " 2) Did you remember to perform sync & fstrim?"
echo ""
echo " Please type 'YES' if you want to continue."
echo ""
read proceed
if [[ "$proceed" != "YES" ]]; then
exit
fi
# script expects exaclty one param (see config_example)
if [ "$#" -ne 1 ]; then
echo "Usage: $0 [config_file]"
exit
fi
# color helpers (set on terminal only)
black=
red=
green=
yellow=
blue=
magenta=
cyan=
white=
reset=
if test -t 1; then
black=`tput setaf 0`
red=`tput setaf 1`
green=`tput setaf 2`
yellow=`tput setaf 3`
blue=`tput setaf 4`
magenta=`tput setaf 5`
cyan=`tput setaf 6`
white=`tput setaf 7`
reset=`tput sgr0`
fi
# pretty printing funcs / vars
cnt=0
all=11
function print_ok {
echo [${green}OK$reset]
}
function print_cnt {
printf " [${cyan}%2s${reset}/${all}${reset}] " ${1}
}
function print_txt {
((++cnt))
print_cnt $cnt
printf "%-30s " "${1}..."
}
# let's do it
echo
echo "### ${magenta}FOOL LIVE KVM BACKUP ${VERSION}${reset} ###"
echo
echo " Using config file: ${yellow}${1}${reset}"
echo
source $1
# some vars
TIMESTAMP=`date +"%Y%m%d_%H%M%S"`
LOG=${DOMAIN}_${TIMESTAMP}.log
DOMAIN_T=${DOMAIN}_${TIMESTAMP}
# tell what we gonna do
echo " Today we backup: ${yellow}${DISK}$reset on ${yellow}${DOMAIN}${reset} as ${yellow}${USER}${reset}"
echo " SOURCE_DIR: ${yellow}${SOURCE}$reset"
echo " TARGET_DIR: ${yellow}${TARGET}$reset"
echo " LIMIT_RATE for tar: ${yellow}${LIMIT_RATE}${reset}/second"
echo " Logging to: ${yellow}${LOG}$reset"
echo
echo " Keep your fingers crossed!"
echo
# chande into target dir
cd $TARGET
print_txt "LOG CURRENT DOMBLK LIST"
sudo -u $USER virsh domblklist $DOMAIN > $LOG
print_ok
print_txt "DUMPING XML"
sudo -u $USER virsh dumpxml $DOMAIN > $DOMAIN_T.xml
sudo -u $USER virsh dumpxml $DOMAIN | sed "s:$SOURCE/${DOMAIN}.img:$SOURCE/${DOMAIN}.SNAP:" > ${DOMAIN_T}_snapped.xml
print_ok
print_txt "SAVING VM (RAM)"
sudo -u $USER virsh save $DOMAIN $DOMAIN_T.ram >> $LOG
print_ok
print_txt "SNAPSHOTTING DISK"
sudo -u $USER virsh snapshot-create-as $DOMAIN SNAP --disk-only --atomic --no-metadata --quiesce >> $LOG
print_ok
print_txt "RESTORING VM (RAM)"
sudo -u $USER virsh restore $DOMAIN_T.ram --xml ${DOMAIN_T}_snapped.xml >> $LOG
print_ok
print_txt "LOG CURRENT DOMBLKLIST"
sudo -u $USER virsh domblklist $DOMAIN >> $LOG
print_ok
print_txt "SAVING SNAPSHOT"
sudo -u $USER tar -C ${SOURCE} -cSf - $DOMAIN.img 2>>$LOG | pv -L $LIMIT_RATE 2>/dev/null 1> $DOMAIN_T.img.tar
print_ok
print_txt "BLOCK-COMMITTING DELTAS"
sudo -u $USER virsh blockcommit $DOMAIN $DISK --pivot >> $LOG
print_ok
print_txt "REMOVING DELTAS"
sudo -u $USER rm ${SOURCE}/$DOMAIN.SNAP >> $LOG
print_ok
print_txt "LOG CURRENT DOMBLKLIST"
sudo -u $USER virsh domblklist $DOMAIN >> $LOG
print_ok
print_txt "LOG QCOW2 IMAGE INFO"
sudo -u $USER qemu-img info ${SOURCE}/$DOMAIN.img >> $LOG
print_ok
echo
echo "### ${magenta}FINITO${reset} ###"
echo
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