ZFS Monitor ZFS snapshots

[Sparkee]

Do you guys have a good way to monitor ZFS snapshots? Sometimes they are not removed and use up precious space. I was looking into using sanoid for this though doesn't always work as expected.
Main goal: list snapshots, if they exists and they are older than a year send a notification, or if they are fresh but space is low send a notification.
If nothing else I can write a script for it just wanted to look around first.

 

[SirDice]

Have a look at sysutils/zfsnap or sysutils/zfsnap2. There are a couple of other tools for creating and managing snapshots. Or script your own of course.

 

[Sparkee]

Thank you!
Sometimes we create a manual snapshot before OS update, pkg update, etc. and never gets removed. I mostly want to monitor these. Not really looking for another management tool, unless, of course the tool does what I'm looking for.

 

[jbo@]

For that use case you might actually want to look into ZFS boot environments: bectl(8)

 

[SirDice]

Yep, for that use-case you typically use bectl(8) (or sysutils/beadm; works slightly different but they are compatible).

 

[Sparkee]

Maybe my post wasn't clear, I'm ONLY looking for this: list snapshots, if they exists and they are older than a year send a notification, or if they are fresh but space is low send a notification.

 

[jbo@]

To me that sounds like a use case simple enough that wouldn't justify evaluating 3rd-party tooling and all the necessary procedures to ensure what you put into production is "safe and sound".
For this simple case I´d just go with writing your own shell script using built-in tooling such as zfs list, awk and so on as SirDice mentioned.

 

[SirDice]

Script something yourself? Just grab a list of snapshots, check the creation property and destroy it if it's too old? Shouldn't be more than a few lines of script.

 

[SirDice]

Not extensively tested but should get you started:

#!/bin/sh

LASTWEEKEPOCH=$(date -v-1w "+%s")

zfs list -r -t snapshot -H -o name | while read snapshot; do
  SNAPDATE=$(zfs get -H -o value creation $snapshot)
  SNAPEPOCH=$(date -j -f "%a %b %d %R %Y" "${SNAPDATE}" "+%s")

  if [ "${SNAPEPOCH}" -lt "${LASTWEEKEPOCH}" ]; then
    echo "$snapshot is more than a week old"
  fi
done

 

[Sparkee]

Not extensively tested but should get you started:

#!/bin/sh

LASTWEEKEPOCH=$(date -v-1w "+%s")

zfs list -r -t snapshot -H -o name | while read snapshot; do
  SNAPDATE=$(zfs get -H -o value creation $snapshot)
  SNAPEPOCH=$(date -j -f "%a %b %d %R %Y" "${SNAPDATE}" "+%s")

  if [ "${SNAPEPOCH}" -lt "${LASTWEEKEPOCH}" ]; then
    echo "$snapshot is more than a week old"
  fi
done

I think this is looking pretty good, thank you!

 

[Lamia]

This is what you most likely wanted - https://github.com/bahamas10/zfs-prune-snapshots.

 

[Sparkee]

This is what you most likely wanted - https://github.com/bahamas10/zfs-prune-snapshots.

Nice, thank you!