Julien LutranandClaude Fable 5
b5aef914f5
Decided 2026-08-28: instances are protected by replication (sdb now, nuc after FTTH, ks2 push in between), their data/DBs/configs by restic-data — a third copy of instance filesystems in S3 was not worth the moving parts. backup-strategy.md now explains the replication-vs-backup split and the rebuild path when no replica survives; restic-backup.md §6 is marked SHELVED (script and empty repo kept). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
# local backup cron on ks4 (leg 1)
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Enabled 2026-08-22 (both ks4 backup crons had been commented out — no
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backup of any kind was running). Overview of all legs:
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[../backup-strategy.md](../backup-strategy.md).
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## What runs now (root crontab on ks4)
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```cron
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0 1 * * * /root/scripts/incus-copy.sh -p backup -s backup >> /var/log/incus-copy.log 2>&1
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```
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- `01:00` — **local leg**: `incus copy --refresh` of all instances
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into project `backup` on the sdb5 `backup` zpool (replaces the old
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push to ks2; see [incus-copy.md](incus-copy.md)). An S3 leg for the
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instance filesystems was designed and shelved
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([restic-backup.md](restic-backup.md) §6).
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- The rsync stopgap to ks2 (`incus-backup.sh`, 04:00) and the plakar
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data leg (04:30) are both **retired**; S3 backups are restic's job
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at 05:00.
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## Cleanup done the same day
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- ks2: `incus delete biwiki spot` (abandoned instances — freed space
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on the 95 %-full `data` pool)
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- ks4: `incus delete spot --project backup`
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## Verification
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```bash
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# all instances present, incl. livetrail (first copy is a full send)
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sudo incus list --project backup -c ns -f csv
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# cron runs land here (manual screen runs don't):
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sudo tail /var/log/incus-copy.log /var/log/incus-backup.log
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# rsync leg freshness, on ks2:
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ls -lat /backup/ns3061243/ | head
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```
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Notes:
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- `flock` in both scripts makes overlapping cron/manual runs abort
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safely instead of racing.
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- Replicas get `boot.autostart=false` set by the script — they must
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never fight the live instances for their static IPs.
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- Keep `snapshots.schedule` set on the sources so refreshes stay
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ZFS-incremental (a refresh without common snapshots falls back to
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rsync). Corollary: the cron must run at least every
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`snapshots.expiry` (7 d) — a longer gap expires every common
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snapshot and the next refresh silently degrades to a **full
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re-send** (observed 2026-08-22: seafile re-sent 933 G after the
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weeks-long gap while the crons were commented out).
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