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docs: update backup architecture for inotify change tracking + consolidated Synology layout [ci skip]

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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Viktor Barzin 2026-04-13 18:16:36 +00:00
parent 28ad11d12c
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AGENTS.md
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@ -65,6 +65,11 @@ Terragrunt-based homelab managing a Kubernetes cluster (5 nodes, v1.34.2) on Pro
- **SQLite on NFS is unreliable** (fsync issues) — always use proxmox-lvm or local disk for databases.
- **NFS mount options**: Always `soft,timeo=30,retrans=3` to prevent uninterruptible sleep (D state).
- **NFS export directory must exist** on the Proxmox host before Terraform can create the PV.
- **Backup (3-2-1)**: Copy 1 = live PVCs on sdc. Copy 2 = sda `/mnt/backup` (PVC file backups, auto SQLite backups, pfSense, PVE config). Copy 3 = Synology offsite (two-tier: sda→`pve-backup/`, NFS→`nfs/`+`nfs-ssd/` via inotify change tracking).
- **weekly-backup** (Sunday 05:00): Auto-discovered BACKUP_DIRS (glob), auto SQLite backup (magic number + `?mode=ro`), pfSense, PVE config. No NFS mirror step (NFS syncs directly to Synology via inotify).
- **offsite-sync-backup** (Sunday 08:00): Step 1: sda→Synology `pve-backup/`. Step 2: NFS→Synology `nfs/`+`nfs-ssd/` via `rsync --files-from` (inotify change log). Monthly full `--delete`.
- **nfs-change-tracker.service**: inotifywait on `/srv/nfs` + `/srv/nfs-ssd`, logs to `/mnt/backup/.nfs-changes.log`. Incremental syncs complete in seconds.
- **Synology layout** (`/volume1/Backup/Viki/`): `pve-backup/` (from sda), `nfs/` (from `/srv/nfs`), `nfs-ssd/` (from `/srv/nfs-ssd`). `truenas/` renamed to `nfs/`, `pve-backup/nfs-mirror/` removed.
## Shared Variables (never hardcode)
`var.nfs_server` (192.168.1.127), `var.redis_host`, `var.postgresql_host`, `var.mysql_host`, `var.ollama_host`, `var.mail_host`