#!/bin/bash
# This script is to look for snaps that are left over
from backups, that # are no longer in use, and delete them.
# This script requires two parameters:
# snap_cleanup
(list or delete all
stale snaps on the specified servers)
NasUser="root"
SnapshotString="snapshot_for_backup"
SshIdentityFile="/root/.ssh/id_rsa_auslxfs00_rsync"
SshBinary=/usr/bin/ssh
# This function receives a volume name as a parameter,
and returns # the number of snaps that are elligible for deletion, defined by
being:
# 1.
Having a certain string in the snapshot name;
# 2.
Not marked as "busy"
function CountStaleSnaps ()
{
local
VolToCheck=$1
local
StaleSnaps=`$SshCmd "snap list $VolToCheck" | grep $SnapshotString |
grep -v "busy" | wc -l`
if [
$? -ne 0 ]; then
{
echo
"getting count of elligible snapshots returned an error"
exit
1
}
else
{
echo
$StaleSnaps
} fi
}
# Function GetStaleSnapNames
# This function creates, given a volume name, an array of
snapshots that are # candidates for deletion.
# Parameters
# 1.
volume to check
function GetStaleSnapNames ()
{
local
Volume=$1
StaleSnapNames=(
$($SshCmd "snap list $Volume" | grep $SnapshotString| grep -v busy |
cut -c 39- | cut -f 1 -d " ") )
if [
$? -ne 0 ]; then
{
echo
"getting names of elligible snapshots returned an error"
exit
1
}
else
{
printf
-- '%s\n' "${StaleSnapNames[@]}"
} fi
}
# Function DelStaleSnaps
# This function deletes stale snaps for the Volume name
passed to it.
# Parameters
# 1.
volume
# 2. snapshot_name
function DelStaleSnaps ()
{
local
Volume=$1
local
SnapToDelete=$2
$SshCmd
"snap delete $Volume $SnapToDelete"
if [
$? -ne 0 ]; then
{
echo
"error deleting snapshot $Volume:$SnapToDelete"
exit
1
}
else
{
echo
"successfully deleted snapshot $Volume:$SnapToDelete"
} fi
}
# Parse command line parameters
case $2 in
"")
echo
"ERROR: you must specify as a second parameter a host name on which you
want to delete snapshots."
;;
*)
NasName=$2
;;
esac
case $1 in
list)
Operation=list
;;
delete)
Operation=delete
;;
*)
echo
"ERROR: invalid operation specified on command line. Please specify either 'list' or 'delete'
followed by the servername on which you want to delete the snapshots."
exit
1
;;
esac
SshCmd="/usr/bin/ssh -i $SshIdentityFile
$NasUser@$NasName"
VolumesToCheck=( `$SshCmd "vol status -b" | cut
-f 1 -d " " | egrep -v "Volume|-----"` )
for CurrentVol in ${VolumesToCheck[@]}; do {
echo
-n "checking $NasName:$CurrentVol... "
StaleSnaps=`CountStaleSnaps
$CurrentVol`
echo
$StaleSnaps
if [
$Operation = list ]; then
if
[ $StaleSnaps -ne 0 ]; then
GetStaleSnapNames
$CurrentVol | awk '{ print " " $1 }'
fi
elif
[ $Operation = delete ]; then
GetStaleSnapNames
$CurrentVol
ArrayOfSnaps=(
$(GetStaleSnapNames $CurrentVol) )
for
TargetSnap in `printf -- '%s\n' "${ArrayOfSnaps[@]}"`; do
DelStaleSnaps
$CurrentVol $TargetSnap
done
fi
}; done
