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Dave Eddy
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ZFS Prune Snapshots
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===================
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Remove snapshots from one or more zpools that match given criteria
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Examples
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--------
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Remove snapshots older than a week across all zpools
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zfs-prune-snapshots 1w
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Same as above, but with increased verbosity and without
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actually deleting any snapshots (dry-run)
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zfs-prune-snapshots -vn 1w
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Remove snapshots older than 3 weeks on tank1 and tank2/backup.
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Note that this script will recurse through *all* of tank1 and
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*all* datasets below tank2/backup
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zfs-prune-snapshots 3w tank1 tank2/backup
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Remove snapshots older than a month on the zones pool that start
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with the string "autosnap_"
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zfs-prune-snapshots 1M -p 'autosnap_' zones
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Timespec
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--------
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The first argument denotes how old a snapshot must be for it to
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be considered for deletion - possible specifiers are
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- `s` seconds
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- `m` minutes
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- `h` hours
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- `d` days
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- `w` weeks
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- `M` months
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- `y` years
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Usage
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-----
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usage: zfs-prune-snapshots [-hnv] [-p <prefix] <time> [[dataset1] ...]
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remove snapshots from one or more zpools that match given criteria
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examples
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# zfs-prune-snapshots 1w
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remove snapshots older than a week across all zpools
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# zfs-prune-snapshots -vn 1w
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same as above, but with increased verbosity and without
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actually deleting any snapshots (dry-run)
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# zfs-prune-snapshots 3w tank1 tank2/backup
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remove snapshots older than 3 weeks on tank1 and tank2/backup.
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note that this script will recurse through *all* of tank1 and
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*all* datasets below tank2/backup
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# zfs-prune-snapshots 1M -p 'autosnap_' zones
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remove snapshots older than a month on the zones pool that start
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with the string "autosnap_"
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timespec
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the first argument denotes how old a snapshot must be for it to
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be considered for deletion - possible specifiers are
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s seconds
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m minutes
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h hours
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d days
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w weeks
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M months
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y years
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options
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-h print this message and exit
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-n dry-run, don't actually delete snapshots
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-p <prefix> snapshot prefix string to match
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-v increase verbosity
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License
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-------
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MIT License
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@ -0,0 +1,162 @@
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#!/usr/bin/env bash
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#
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# script to prune zfs snapshots over a given age
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#
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# Author: Dave Eddy <dave@daveeddy.com>
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# Date: November 20, 2015
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# License: MIT
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usage() {
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local prog=${0##*/}
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cat <<-EOF
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usage: zfs-prune-snapshots [-hnv] [-p <prefix] <time> [[dataset1] ...]
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remove snapshots from one or more zpools that match given criteria
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examples
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# zfs-prune-snapshots 1w
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remove snapshots older than a week across all zpools
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# zfs-prune-snapshots -vn 1w
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same as above, but with increased verbosity and without
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actually deleting any snapshots (dry-run)
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# zfs-prune-snapshots 3w tank1 tank2/backup
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remove snapshots older than 3 weeks on tank1 and tank2/backup.
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note that this script will recurse through *all* of tank1 and
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*all* datasets below tank2/backup
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# zfs-prune-snapshots 1M -p 'autosnap_' zones
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remove snapshots older than a month on the zones pool that start
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with the string "autosnap_"
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timespec
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the first argument denotes how old a snapshot must be for it to
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be considered for deletion - possible specifiers are
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s seconds
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m minutes
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h hours
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d days
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w weeks
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M months
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y years
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options
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-h print this message and exit
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-n dry-run, don't actually delete snapshots
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-p <prefix> snapshot prefix string to match
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-v increase verbosity
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EOF
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}
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debug() {
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((verbosity >= 1)) && echo "$@"
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return 0
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}
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# given a time in seconds, return the "human readable" string
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human() {
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local seconds=$1
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if ((seconds < 0)); then
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((seconds *= -1))
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fi
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local times=(
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$((seconds / 60 / 60 / 24 / 365)) # years
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$((seconds / 60 / 60 / 24 / 30)) # months
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$((seconds / 60 / 60 / 24 / 7)) # weeks
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$((seconds / 60 / 60 / 24)) # days
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$((seconds / 60 / 60)) # hours
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$((seconds / 60)) # minutes
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$((seconds)) # seconds
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)
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local names=(year month week day hour minute second)
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local i
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for ((i = 0; i < ${#names[@]}; i++)); do
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if ((${times[$i]} > 1)); then
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echo "${times[$i]} ${names[$i]}s"
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return
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elif ((${times[$i]} == 1)); then
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echo "${times[$i]} ${names[$i]}"
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return
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fi
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done
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echo '0 seconds'
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}
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dryrun=false
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verbosity=0
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prefix=
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while getopts 'hnp:v' option; do
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case "$option" in
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h) usage; exit 0;;
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n) dryrun=true;;
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p) prefix=$OPTARG;;
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v) ((verbosity++));;
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*) usage; exit 1;;
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esac
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done
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shift "$((OPTIND - 1))"
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# extract the first argument - the timespec - and
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# convert it to seconds
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t=$1
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time_re='^([0-9]+)([smhdwMy])$'
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seconds=
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if [[ $t =~ $time_re ]]; then
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# ex: "21d" becomes num=21 spec=d
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num=${BASH_REMATCH[1]}
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spec=${BASH_REMATCH[2]}
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case "$spec" in
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s) seconds=$((num));;
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m) seconds=$((num * 60));;
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h) seconds=$((num * 60 * 60));;
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d) seconds=$((num * 60 * 60 * 24));;
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w) seconds=$((num * 60 * 60 * 24 * 7));;
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M) seconds=$((num * 60 * 60 * 24 * 30));;
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y) seconds=$((num * 60 * 60 * 24 * 365));;
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*) echo "error: unknown spec '$spec'" >&2; exit 1;;
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esac
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elif [[ -z $t ]]; then
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echo 'error: timespec must be specified as the first argument' >&2
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exit 1
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else
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echo "error: failed to parse timespec '$t'" >&2
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exit 1
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fi
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shift
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pools=("$@")
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now=$(date +%s)
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cutoff=$((now - seconds))
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code=0
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while read -r snapshot creation; do
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# ensure optional prefix matches
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snapname=${snapshot#*@}
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if [[ -n $prefix && $prefix != ${snapname:0:${#prefix}} ]]; then
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debug "skipping $snapshot: doesn't match prefix $prefix"
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continue
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fi
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# ensure snapshot is older than the cutoff time
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delta=$((now - creation))
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human=$(human "$delta")
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if ((delta <= seconds)); then
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debug "skipping $snapshot: $human old"
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continue
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fi
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# remove the snapshot
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echo -n "removing $snapshot: $human old"
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if $dryrun; then
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echo ' <dry-run: no action taken>'
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else
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echo
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zfs destroy "$snapshot" || code=1
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fi
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done < <(zfs list -Hpo name,creation -t snapshot -r "${pools[@]}")
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exit "$code"
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