little script to keep the snapshot-count in check for my truenas. "frequently" went above ~10k as i replicate every hour. syncoid_cleanup.sh

syncoid_cleanup.sh

#!/bin/sh
ROOT="p0/bak/home"
frequently=4
hourly=36
daily=30
monthly=3
_remove_old_snaps() {
  COUNT=$(echo "{$1}" |wc -l)
  #echo "COUNT: ${COUNT}"
  if [ "$COUNT" -gt "$2" ]
  then
    for snap in $(echo "$1"|tail -n +"$2"); do
      #DUMMY
      echo zfs destroy -v "$snap"
      #zfs destroy -v "$snap"
    done
  fi
}
for DATASET in $(zfs list -r -H -o name "${ROOT}")
do
  echo "${DATASET}"
  PSNAPS=$(zfs list -H -t snapshot -o name "${DATASET}")
  FREQUENTLY=$(echo "${PSNAPS}" | grep frequently)
  _remove_old_snaps "$FREQUENTLY" $frequently
  HOURLY=$(echo "${PSNAPS}" | grep hourly)
  _remove_old_snaps "$HOURLY" $hourly
  DAILY=$(echo "${PSNAPS}" | grep daily)
  _remove_old_snaps "$DAILY" $daily
  MONTHLY=$(echo "${PSNAPS}" | grep monthly)
  _remove_old_snaps "$MONTHLY" $monthly
done