Am 03.09.2010 11:40, schrieb Paul Bijnens:
>
> Hi Stefan and fellow amanda-users,
>
> Catching up on my mail...
>
> Just to confirm that you may post the script.
> Anybody even use it and adapt it to his needs.
> It's free software (as in "free beer" and in "free speech").
>
> Although the script is a bit dated for the current amanda...
> (Still need to catch up on that too.)
Ok, thanks, Paul ...
I post it with a short explanation:
The attached script gets called via crontab before and after amdump.
Something like:
# create snapshots before amdump
50 20 * * 1-5 /root/bin/make_snapshot_lvm2 -s 2g VG01:amhold:-
VG01:vm_data:15g VG01:vm_apps:25g VG01:rsnapshots:-
# remove snapshots before users start work
00 07 * * * /root/bin/make_snapshot_lvm2 -r
---
You add DLEs like
/snap/_mnt_vm_apps
where the script mounts the snapshots (under /snap as configured in the
script).
I use it for some years now and it works very well.
Thanks again, Paul, for sharing.
Let's see what other amanda-users think of it ...
Stefan
#!/bin/sh
# Create a snapshot for the backups
set -vx
USAGE="$0 [-r] [-n] [-s 512m] [VG:LV:size] ..."
VERBOSE=
REMOVEONLY=
DONOTREMOVE=
SIZE=512m # default size
SNAPTOP=/snap
test -d $SNAPTOP || mkdir -p $SNAPTOP || exit 1
while getopts vnrs: i
do
case $i in
v) VERBOSE=verbose ;;
n) DONOTREMOVE=donotremove ;;
r) REMOVEONLY=removeonly ;;
s) SIZE=$OPTARG ;; # default size
\?) echo $USAGE
exit 2 ;;
esac
done
shift `expr $OPTIND - 1`
# SPECS in format 'VG00:LVvar:128m VG00:LVspace:4g VG00::LVother:-'
# use size "-" to skip creating a snapshot for that volume
SPECS="$*";
PATH=/sbin:/usr/sbin:/bin:/usr/bin:$PATH; export PATH
test -n "$VERBOSE" && lvs --sort lv_name
test -n "$VERBOSE" && echo
lvs --noheadings --nosuffix --units m --options vg_name,lv_name,lv_size,origin
--sort -origin |
while read vg_name lv_name lv_size origin
do
test -n "$VERBOSE" && echo Considering $vg_name $lv_name $lv_size
origin=$origin
lv__name=`echo $lv_name | sed -e 's/-/--/g'`
if [ -n "$origin" -a -z "$DONOTREMOVE" ]
then
test -n "$VERBOSE" && echo Removing $vg_name $lv_name
## original from Paul: /dev/$vg_name/$lv_name
#if test -e /dev/$vg_name/$lv_name && grep "^/dev/$vg_name/$lv_name "
/proc/mounts >/dev/null
## SLES: /dev/mapper/VG01-_mnt_vm_apps.2009.05.11T14.33.01.CEST.snap
if test -e /dev/$vg_name/$lv_name && grep
"^/dev/mapper/$vg_name-$lv_name " /proc/mounts >/dev/null
then
test -n "$VERBOSE" && echo Killing any processes having files
open on $vg_name $lv_name
fuser -kvm $SNAPTOP/$lv_name
test -n "$VERBOSE" && echo Umounting $vg_name $lv_name
umount /dev/$vg_name/$lv_name
fi
test -n "$VERBOSE" && echo Remove dir $SNAPTOP/$lvname
rmdir $SNAPTOP/$lv_name
test -n "$VERBOSE" && echo Remove snapshot /dev/$vg_name/$lv_name
lvremove -f /dev/$vg_name/$lv_name >/dev/null || {
echo Remove Snapshot /dev/$vg_name/$lv_name error
exit 1
}
continue
fi
if [ -n "$origin" -o -n "$REMOVEONLY" ]
then continue
fi
mountpoint=`mount | grep "$vg_name-$lv__name" | sed -e 's/.* on //' -e 's/
type .*//'`
case $mountpoint in
/) continue ;; # snapshots for root fs are not working (??)
/tmp) continue ;; # neither for /tmp
"") continue ;; # e.g. swap
esac
vg_free=`vgs --noheadings --options vg_free $vg_name`
snapsize=`echo $SPECS | sed -n 's/.*'"$vg_name"':'"$lv_name"':\([^,
]*\).*/\1/p'`
if [ "$snapsize" = "-" ] # skip this volume
then continue
fi
test -z $snapsize && snapsize=$SIZE
mountpoint=`echo $mountpoint | tr '/' '_'`
# Date in ISO 8601 format, see
# http://www.iso.ch/iso/en/prods-services/popstds/datesandtime.html
# but, colon is a forbidden char for snapshot names,
# and hyphens are doubled (could be but ok, creates confusion)
# snapname=${mountpoint}.`date +%Y-%m-%dT%H:%M:%S`.snap
snapname=${mountpoint}.`date +%Y.%m.%dT%H.%M.%S.%Z`.snap
test -n "$VERBOSE" && echo "Creating snapshot $vg_name $lv_name
($snapsize): $snapname"
lvcreate --snapshot --size $snapsize --name $snapname \
/dev/$vg_name/$lv_name >/dev/null || {
echo Create Snapshot $snapname error
exit 1
}
snapdir=$SNAPTOP/$snapname
mkdir $snapdir
rm -f $SNAPTOP/$mountpoint
ln -s $SNAPTOP/$snapname $SNAPTOP/$mountpoint # symlink for Amanda
test -n "$VERBOSE" && echo Mounting $snapdir
mount -o ro /dev/$vg_name/$snapname $snapdir
done
test -n "$VERBOSE" && echo
test -n "$VERBOSE" && lvs --sort lv_name
test -n "$VERBOSE" && echo
