Claude Fable 5
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Since #224 read_events is partitioned; the dump carries per-partition primary keys as own entries, and pg_restore --clean emitted DROP CONSTRAINT against inherited constraints, which PostgreSQL refuses. The restore then reported FAILED although the content was restored. Dropping and recreating the public schema first makes every --clean drop a no-op and the restore faithful: objects created after the backup no longer survive. Verified in the isolated environment of #220 (set 20260731-132200, exit 0, readyz green). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AUtYMxwTCMHG9mVHnwbFg8
90 lines
4.4 KiB
Markdown
90 lines
4.4 KiB
Markdown
# Restore runbook (ADR 0015, issue #87)
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How to restore a Dorfteich stage from a nightly backup set — manually in an
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incident, automatically as the monthly drill. The same procedure doubles as
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the **Prod relocation procedure**: restore the latest set on the new host.
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A restore set is one backup id `YYYYMMDD-HHMMSS`: `db-<id>.dump`
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(`pg_dump -Fc`) plus `files-<id>.tar.gz` (uploads + plugins volumes),
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written nightly by the `backup` sidecar onto the `backups` volume, with
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`status.json` describing the last run (deploy/monitoring.md).
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## Manual restore (incident / relocation)
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On the stage host, from the stage directory (`/srv/DOCKER/dorfteich-<stage>/`):
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1. **Pick the set.** `docker compose exec backup ls /backups` — usually the
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id in `status.json` → `lastSuccess.backupId`.
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2. **Run the automated runbook:** `./restore.sh <backup-id>`
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(`deploy/backup/restore.sh`). It stops `web`/`api`/`collab` (the db stays
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up), resets the `public` schema and replays the dump with `pg_restore`
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(#288 — objects created after the backup do not survive) and unpacks
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the volume archive through the backup sidecar image, starts the stack,
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and polls `/readyz`.
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3. **Verify:** `/readyz` fully green, spot-check one page and one uploaded
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file in the browser.
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Consistency model (ADR 0015): the volume archive is taken minutes after the
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dump — a page referencing a file uploaded in between shows a missing image,
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never corruption.
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**Relocation to a new host:** provision the stage directory (compose +
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`.env`, deploy/stages.md), start only `db` and `backup`
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(`docker compose up -d db backup`), copy the set into the backups volume
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(`docker run --rm -v <src> -v <project>_backups:/backups …`), then steps 2–3.
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## In-app restore (issue #103)
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With a Nextcloud target configured, Site Admins can restore without shell
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access: _Admin → System → Backups → Restore_ lists local and remote sets;
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after a type-to-confirm prompt the backup sidecar orchestrates the whole
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restore (maintenance mode → download + verify → terminate connections →
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`pg_restore` + volume extract → api restart). Progress lands in
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`restore-status.json` next to `status.json`; the public
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`GET /api/v1/backup/restore-status` endpoint keeps answering while
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everything else serves 503 `maintenance_mode`. This runbook stays the
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disaster path for when the app itself is gone.
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## Fetching a set from Nextcloud (total loss)
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When the host is gone but the off-host copies exist, rebuild from the
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Nextcloud bundle alone:
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1. Download `dorfteich-backup-<id>.tar.gz` from the configured Nextcloud
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folder (browser or `curl -u <user>:<app-password> -O
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https://cloud.example.com/remote.php/dav/files/<user>/<folder>/dorfteich-backup-<id>.tar.gz`).
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2. Unpack it: `tar -xzf dorfteich-backup-<id>.tar.gz` → `db-<id>.dump`,
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`files-<id>.tar.gz`, and a `manifest.json` describing the set.
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3. Copy the two artifacts into the (fresh) stack's backups volume — see
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_Relocation to a new host_ above — and run `./restore.sh <id>`.
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## Automated monthly drill (`.gitea/workflows/drill.yml`)
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Runs on the 1st of each month — and on demand by pushing a `drill-*` tag
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(`git tag drill-$(date +%s) && git push origin --tags`; Gitea 1.22 has no
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workflow-dispatch button yet). It executes `deploy/backup/drill.sh`, which
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- reads the drilled stage's backups volume **read-only** (stage volumes are
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never touched — everything scratch lives under a unique
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`dorfteich-drill-<timestamp>` prefix and is removed afterwards),
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- restores the latest successful set into a throwaway Postgres + volumes
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using the same backup-image code path as `restore.sh`,
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- boots the api image against the result and checks: readyz database +
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migrations ok, ≥ 1 user and live page, ≥ 1 rendered page in the content
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cache, a public API request answers 200, and one media file's bytes on
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the volume match its database row,
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- reports the outcome as a comment on the pinned **Restore drills** issue
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(#98), then tears the scratch environment down (also on failure).
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Pre-go-live the drill restores the **Test** stage's set
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(`DRILL_SOURCE_VOLUME: dorfteich-test_backups`); at go-live (#89) point it
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at the Prod backups volume. Manual invocation on the stage host:
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```sh
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SOURCE_VOLUME=dorfteich-test_backups sh deploy/backup/drill.sh
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```
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A drill failure means the current backup set is **not restorable** — treat
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it like a failed backup: check the sidecar logs and `status.json`, fix, and
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re-run the drill the same day.
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