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Marc-André Bombeck
d8fcf814b2
/api/health gives the database two seconds and answers 503 past that. With three retries, a pool saturated for a minute after the start period could mark the container unhealthy and take it out of the proxy's routing. The compose healthcheck and the image's HEALTHCHECK now allow five misses (two and a half minutes) and end wget after four seconds, inside Docker's five, so a stalled request is one clean miss. A test holds both to these bounds and to each other.
123 lines
6.6 KiB
Markdown
123 lines
6.6 KiB
Markdown
# HealthLog on TrueNAS SCALE
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HealthLog runs on TrueNAS SCALE as a Docker app: one `app` container from
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`ghcr.io/mbombeck/healthlog` and one PostgreSQL 16 database. The app container
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is stateless; everything you care about lives in the database dataset and in
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one value you must keep yourself: the encryption key.
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## What the app needs
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| Setting | Value |
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| ------------ | ---------------------------------------------------------------------------------------- |
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| Image | `ghcr.io/mbombeck/healthlog`, tag `X.Y.Z` (amd64 and arm64) |
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| Port | `3000` (HTTP) |
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| User | runs as uid `1001`; no extra capabilities, `no-new-privileges` is fine |
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| Health check | `GET /api/health`, `200` when ready |
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| Start period | at least 60 s, with more retries than the image's 5 × 30 s: migrations run at every boot |
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| Database | PostgreSQL 16 (17 and later are not a drop-in), no extensions |
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| Volumes | none for the app; the database gets its own dataset |
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## Environment
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| Variable | Required | Notes |
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| ----------------------- | -------- | ------------------------------------------------------------------------------------------- |
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| `DATABASE_URL` | yes | `postgresql://<user>:<password>@<host>:5432/<db>` |
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| `ENCRYPTION_KEY` | yes | 64 hex characters: `openssl rand -hex 32`. Keep a copy outside the NAS (see below). |
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| `API_TOKEN_HMAC_KEY` | yes | 64 hex characters, generated the same way. Changing it signs everyone out. |
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| `NEXT_PUBLIC_APP_URL` | yes | the address people open, for example `http://truenas.local:30180` |
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| `APP_URL` | yes | the same address |
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| `SESSION_COOKIE_SECURE` | no | `false` for a LAN install served over plain `http://`; leave unset behind an HTTPS proxy |
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| `HEALTHLOG_PLATFORM` | no | `truenas`: the admin's key backup step opens on the TrueNAS instructions |
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| `GEOLITE2_DIR` | no | a mounted directory of GeoLite2 `.mmdb` files, so sign-in locations are resolved on the NAS |
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`HEALTHLOG_PROCESS_TYPE` stays unset (`all`): one container serves the web app
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and runs the background jobs.
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## Plain HTTP on the LAN
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Most NAS installs are reached over `http://`. Set `SESSION_COOKIE_SECURE=false`
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for that. If it is left at its default, the browser drops the sign-in cookie
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and the login page says so before you type a password: "This server only sets
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its sign-in cookie over https://".
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## Back up your encryption key
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HealthLog encrypts tokens, notes, documents and in-database backups with
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`ENCRYPTION_KEY`. The key is not stored in the database. If the app is deleted
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and reinstalled with a new key over the old database dataset, the data is
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still there but cannot be read.
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1. Copy `ENCRYPTION_KEY` from the app's settings (Apps, HealthLog, Edit,
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Environment) into your password manager.
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2. Sign in as the admin and open Admin, Encryption. The step shows the key id
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and a fingerprint, the first 12 hex characters of SHA-256 over the key.
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Compare it with your copy:
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```bash
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echo -n "<your key>" | xxd -r -p | sha256sum | cut -c1-12
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```
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or paste the copy into "Check my copy" (it is compared and dropped, never
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stored or logged).
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3. Confirm the backup. Until you do, admins see a reminder on the dashboard.
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After a key rotation the step comes back for the new key.
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## When the key does not match the database
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At every start HealthLog checks that its key opens the data already in the
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database. If it does not, it refuses to serve instead of failing on every
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encrypted value: pages show "HealthLog cannot open its data", API requests
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answer `503` with `meta.errorCode` `encryption.key_mismatch`, `/api/health`
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answers `503` with `reason: "encryption_key_mismatch"`, and no background jobs
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run. TrueNAS shows the app as unhealthy rather than crashed, so the reason
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stays visible.
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Fix it one of three ways, then restart the app:
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1. Put the original `ENCRYPTION_KEY` back.
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2. Point `DATABASE_URL` at the database that belongs to this key.
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3. Start fresh with an empty database. The old data and its backups need the
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old key.
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Before it records a key as the right one, the check reads the oldest
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encrypted values in the database and records the key only if they open (or if
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the database holds no encrypted value under that key id yet). When the data
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proves neither, the app keeps serving, records nothing, writes a warning
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starting with `[boot] Encryption key check inconclusive` to the log, and
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checks again at the next start.
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### Resetting the check
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If you are certain the configured key is the one the data was written with,
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and the app still refuses because the check recorded a different key earlier,
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remove that record and restart. Open a shell on the database container (Apps,
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HealthLog, the database container's Shell) and run, with the key id the log
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names (`v1` unless you use `ENCRYPTION_KEYS`):
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```bash
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psql -U healthlog healthlog \
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-c "DELETE FROM encryption_key_canaries WHERE key_id = 'v1';"
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```
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Then restart the app. It probes the stored data again and records the key
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only if that data opens with it. If the key is in fact wrong, the app then
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fails on every encrypted value instead of refusing clearly, so only do this
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when you are sure. After a key rotation you never need this for the old key
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id: the rotation script removes its record once no values remain under it.
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On a first start there is no record to remove. If the check refuses there and
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you are certain the key is right, add `ENCRYPTION_KEY_CHECK` = `warn` under
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Apps, HealthLog, Edit, Environment as a last resort. The check still runs and
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logs, `/api/health` reports `warning: "encryption_key_mismatch"` without
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failing, the app serves, and no key is recorded until the check passes. This
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switches off a safety check: with a wrong key every encrypted value fails and
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new data is written under that key. Remove the setting once the key is
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confirmed.
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## Updates
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Pick the new tag, take a snapshot of the database dataset first, and update.
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Migrations run on start; the first start of a new install applies all of them,
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which is why the start period above is generous.
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