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docs: add storage class decision rule to CLAUDE.md

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Default to proxmox-lvm for all new services. NFS only for RWX,
backup destinations, or shared media libraries. Updated iSCSI
backup section to reflect proxmox-lvm migration.
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Viktor Barzin 2026-04-04 16:35:12 +03:00
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.claude/CLAUDE.md
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@ -120,18 +120,57 @@ Repo IDs: infra=1, Website=2, finance=3, health=4, travel_blog=5, webhook-handle
## Storage & Backup Architecture
### Storage Class Decision Rule (for new services)
Choose storage class based on workload type:
| Use **proxmox-lvm** when | Use **NFS** (`nfs_volume` module) when |
|--------------------------|----------------------------------------|
| Database files (SQLite, embedded DBs) | Shared data across multiple pods (RWX) |
| Write-heavy / fsync-heavy workloads | Media libraries (music, ebooks, photos) |
| Single-pod app state (RWO is fine) | Backup destinations (cloud sync picks up from NFS) |
| Latency-sensitive data | Large datasets (>10Gi) where snapshots matter |
| Any new service by default | Data you want to browse/inspect from outside k8s |
**Default is proxmox-lvm.** Only use NFS when you need RWX, backup pipeline integration, or it's a large shared media library.
**proxmox-lvm PVC template** (Terraform):
```hcl
resource "kubernetes_persistent_volume_claim" "data_proxmox" {
wait_until_bound = false
metadata {
name = "<service>-data-proxmox"
namespace = kubernetes_namespace.<ns>.metadata[0].name
annotations = {
"resize.topolvm.io/threshold" = "80%"
"resize.topolvm.io/increase" = "100%"
"resize.topolvm.io/storage_limit" = "5Gi"
}
}
spec {
access_modes = ["ReadWriteOnce"]
storage_class_name = "proxmox-lvm"
resources {
requests = { storage = "1Gi" }
}
}
}
```
- `wait_until_bound = false` is **required** (WaitForFirstConsumer binding)
- Deployment strategy **must be Recreate** (RWO volumes)
- Autoresizer annotations are **required** on all proxmox-lvm PVCs
- Every proxmox-lvm app **MUST** add a backup CronJob writing to NFS `/mnt/main/<app>-backup/`
### Cloud Sync (TrueNAS → Synology NAS)
- **Task 1**: Weekly push (Monday 09:00) of `/mnt/main` NFS data to `nas.viktorbarzin.lan:/Backup/Viki/truenas`
- **zfs diff optimization**: Pre-script diffs `main@cloudsync-prev` vs `main@cloudsync-new`, writes changed files to `/tmp/cloudsync_files.txt`. Args: `--files-from /tmp/cloudsync_files.txt --no-traverse`. Post-script rotates snapshots. Falls back to full `find` if no prev snapshot or >100k changes.
- **Excludes**: ytldp, prometheus, logs, post, crowdsec, servarr/downloads, iscsi, iscsi-snaps, frigate, audiblez, ebook2audiobook, ollama, real-estate-crawler
### iSCSI Backup Architecture
- iSCSI zvols are raw block devices exported to k8s nodes via democratic-csi
- TrueNAS cannot read filesystem contents inside zvols — only the k8s pod can
- **Local protection**: ZFS snapshots (every 12h, 24h retention + daily, 3-week retention) cover zvols automatically
- **Offsite protection**: Application-level backup CronJobs dump data to NFS paths, which Task 1 syncs to Synology
- **Current CronJob coverage**: MySQL (mysqldump), PostgreSQL (pg_dumpall), Vault (raft snapshot), Redis (BGSAVE), Vaultwarden (sqlite3 .backup)
- **Convention**: Any new iSCSI-backed app MUST add a backup CronJob to its Terraform stack that writes to `/mnt/main/<app>-backup/`
### Proxmox-LVM Backup Architecture
- proxmox-lvm volumes are thin LVs on the Proxmox host — opaque to TrueNAS
- **Offsite protection**: Application-level backup CronJobs dump data to NFS paths, which Cloud Sync Task 1 syncs to Synology
- **Current CronJob coverage**: MySQL (mysqldump), PostgreSQL (pg_dumpall), Vault (raft snapshot), Redis (BGSAVE), Vaultwarden (sqlite3 .backup), Headscale (sqlite3 .backup)
- **Convention**: Any new proxmox-lvm app MUST add a backup CronJob to its Terraform stack that writes to `/mnt/main/<app>-backup/`
- **Uncovered (acceptable)**: Prometheus (disposable metrics), Loki (disposable logs), plotting-book and novelapp (small, low-priority)
## Known Issues