63 lines
1.1 KiB
Markdown
63 lines
1.1 KiB
Markdown
---
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title: "ZFS Automatic Snapshotting"
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date: 2022-10-31T17:56:35Z
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tags: ["archlinux", "linux", "zfs"]
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draft: true
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icon: backup
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---
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## Goal
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## Solution
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### Creating snapshots
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{{< codegroup >}}
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Systemd-timer
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```
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[Unit]
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Description=Create a daily ZFS snapshot for %I
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[Timer]
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OnCalendar=daily
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Persistent=true
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[Install]
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WantedBy=timers.target
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```
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---
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Systemd-service
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```
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[Unit]
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Description=Create a ZFS snapshot for %I
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DefaultDependencies=no
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=/usr/bin/bash -c '/usr/bin/zfs snapshot "%I@daily-$(date "+%%Y-%%m-%%d")"'
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```
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{{< /codegroup >}}
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### Cleaning up snapshots
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Get all older snapshots
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{{< codegroup >}}
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bash
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```
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zfs list -t snapshot -o name | \
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perl -e '
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my $one_week_ago = `date --date "7 days ago" "+%s"`;
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my %snapshots = ();
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for (<>) {
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if (my ($dataset, $snapshot, $date) = /([\w\/]+)@(daily-(\d+\-\d+\-\d+))/) {
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if (`date --date "$date" "+%s"` < $one_week_ago) {
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push(@{$snapshots{$dataset}}, $snapshot);
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}
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}
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}
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while(my ($key, $value) = each %snapshots) {
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print "$key@", join(",", @{$value}), "\n";
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}'
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```
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{{< /codegroup >}}
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