petal/deploy

Deploying Petal

Two deployments exist right now:

	host	shape	status
millenia	192.168.1.212 / 100.64.0.2	bare binary in a screen session on :8088, Piper as user systemd units	canonical — her real writing lives here
parodia	petal.parodia.dev / 100.64.0.1	docker compose behind the host's Traefik	staging; empty database

millenia stays canonical until Phase 16's auth lands, so she only moves accounts once. Everything below is the VPS side; the millenia Piper notes are kept in the appendix because that instance still runs them.

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1. The VPS stack

docker-compose.yml at the repo root brings up three containers:

• petal — the single Go binary with the frontend embedded. Publishes no host port; Traefik is the only way in.
• piper-en / piper-zh — read-aloud. Each Piper HTTP server loads exactly one voice, so English and Chinese are separate containers off one image, with the models cached in a shared volume. They sit on an internal network with no published ports, so only Petal can reach them. Adding pt-PT in Phase 21 is a fourth service, not a new image.

They run as containers rather than the host systemd units millenia uses because Piper was never actually installed on the VPS, and the reala account has no lingering session to keep user units alive across logout.

Prerequisites on the host

• Docker with the compose plugin, and the existing external traefik network
• A DNS A record for the hostname pointing at the VPS (petal.parodia.dev is already in place)

First deploy

ssh reala@100.64.0.1
git clone https://gitea.parodia.dev/drwily/petal.git ~/petal
cd ~/petal
cp deploy/petal.env.example .env

Then edit .env:

• PETAL_UID / PETAL_GID — id -u / id -g for this account. ./data is a bind mount, so the image's own petal user has no claim on it; a mismatch shows up as unable to open database file (14) and a restart loop.
• PETAL_BASIC_AUTH — the interim edge gate, see §4.
• LLM_MODEL / LLM_CHAT_MODEL — see §3.

mkdir -p data/backups
docker compose up -d --build
docker compose ps        # all three healthy

Updating

cd ~/petal && git pull && docker compose up -d --build

The frontend is embedded in the binary, so a rebuild is the whole deploy. The client polls /api/version (a hash of the built index.html) and offers a refresh when it changes.

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2. What Traefik does

Labels follow the convention the other services on this box use: the external traefik network, the web-secure entrypoint, the default cert resolver and compression@file. Petal adds its own response-header middleware (frame-ancestors 'self', HSTS, nosniff, Referrer-Policy: same-origin).

/api/health is deliberately on its own higher-priority router with no middleware: a monitoring probe must not need a credential, and the endpoint carries no user data.

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3. The LLM link over headscale

The vLLM backend stays on millenia and is reached over headscale (100.64.0.2). This is the only cross-VPN dependency, and by the LLM-minimalism principle it never gates essential functionality — spell check, gloss, vocabulary garden, search, export and read-aloud all keep working with the link down, and the status bar shows the warm 🌙 小助手在休息 · Petal's helper is resting · 文字已保存.

LLM_TIMEOUT is raised from the local-network default of 30s to 90s: the voice and collocation passes send a whole document, the timeout is a hard deadline on the completion call, and a WAN+VPN round trip eats the margin.

How the link is exposed — a forwarder, not a rebind

vLLM stays bound to 127.0.0.1:8000. vllm-headscale-proxy.service (a socat unit, in this directory) adds a second listener on 100.64.0.2:8000 that forwards to it.

The plan originally said to rebind vLLM itself. That turned out to be the expensive option: vllm-chat.service is shared — Petal, Gogobee and Open WebUI all point at 127.0.0.1:8000, and Open WebUI stores its endpoint in its own database rather than in env — so moving the bind address would mean editing three consumers and reloading a 35B AWQ model, minutes of downtime for all of them. The forwarder adds a door instead of moving one: local callers are untouched, and the only new exposure is on the VPN interface.

It binds 100.64.0.2 specifically, never 0.0.0.0: the far end of this link is a public host, and the LAN has no business seeing an unauthenticated inference endpoint.

sudo install -m 0644 deploy/vllm-headscale-proxy.service /etc/systemd/system/
sudo systemctl daemon-reload && sudo systemctl enable --now vllm-headscale-proxy
ss -lntp | grep 8000          # expect BOTH 127.0.0.1:8000 and 100.64.0.2:8000

The model id (qwen3.6-35b) goes into LLM_MODEL / LLM_CHAT_MODEL on the VPS. Verified end to end: a grammar checkpoint from petal.parodia.dev returns real suggestions in ~3s over the VPN.

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4. Interim edge gate (delete when Phase 16 lands)

Petal authenticates nobody yet — StaticResolver hands every request the same local user. On a public host that means anyone who finds the hostname can read and write documents and fill the disk with image uploads, so Traefik holds the door with basic auth until the OIDC flow exists.

Generate a credential:

htpasswd -nbB petal 'your-password'      # or any bcrypt htpasswd generator

and put the resulting user:hash pair in .env as PETAL_BASIC_AUTH.

When Phase 16 lands, delete the petal-auth middleware label, the petal-health router labels, and this section.

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5. Backups

On the VPS — folded into parodia-backup

Petal rides the host's existing offsite job (/usr/local/bin/parodia-backup, parodia-backup.timer, nightly ~03:40): age-encrypted to S3, 14-day retention, dead-man snitch. The host holds only the age public recipient, so it writes backups it cannot itself decrypt.

push petal.db.age       sqlite_file_dump /home/reala/petal/data/petal.db

/home/reala/petal/.env is in the same job's secrets tarball — it carries the interim basic-auth hash and, from Phase 16, the OIDC client secret.

Why sqlite_file_dump and not the script's existing sqlite_dump: that helper uses Python's iterdump, which does not reproduce an FTS5 virtual table. It emits documents_fts as a raw sqlite_master row plus its shadow tables, and replaying the result dies with no such table: documents_fts — verified by round-tripping a real dump on 2026-07-27. Petal's cross-document search would have been silently missing after any restore. sqlite_file_dump runs VACUUM INTO instead: a genuine database file, virtual tables intact, WAL folded in, no write lock. Restore is a copy rather than a replay.

If apply.db ever gains a virtual table, it needs the same treatment.

Restore (VPS)

age -d -i <offline-identity> petal.db.age > /tmp/petal.db   # from S3
cd ~/petal
docker compose stop petal                       # stop writers first
mv data/petal.db data/petal.db.before-restore   # keep the current state
rm -f data/petal.db-wal data/petal.db-shm       # a stale WAL against a new file
cp /tmp/petal.db data/petal.db
docker compose start petal
docker compose logs petal --tail 5              # expect "database ready"

To sanity-check an archive before committing to it, have Petal open it in a scratch directory — a clean exit means it reads end to end:

mkdir -p /tmp/restore-check && cp /tmp/petal.db /tmp/restore-check/petal.db
docker run --rm -v /tmp/restore-check:/data --user "$(id -u):$(id -g)" \
  --entrypoint sh petal:local -c '/app/petal -backup /data/verify.db'

⚠️ millenia — the canonical instance — has no automated backup

This is the real gap. Her actual writing lives on millenia, and as of 2026-07-27 nothing backs it up on a schedule: ~/petal/backups holds only ad-hoc pre-deploy snapshots, the newest a month old. The empty VPS staging database is currently better protected than the live one.

deploy/backup-petal.sh is written for exactly this and is not yet installed there — it snapshots via petal -backup (VACUUM INTO, safe against the live app), compresses, pushes off-box with a post-transfer size check, and prunes both ends. What it does not yet do is encrypt at rest, which is being decided separately.

A manual snapshot any time, no tooling required:

cd ~/petal && ./petal -backup ~/petal/backups/manual-$(date -u +%Y%m%dT%H%M%SZ).db

⚠️ millenia's Petal is unsupervised

It runs as a bare ./petal with PPID 1 — no systemd unit, no screen session. A crash or reboot leaves it down until someone notices. deploy/piper.service is the pattern to copy if you want it supervised.

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Appendix — Piper on millenia (user systemd units)

millenia still runs Piper as user services; these are the original notes.

scp deploy/piper.service deploy/setup-piper.sh 192.168.1.212:/tmp/
ssh 192.168.1.212 'cd /tmp && sudo ./setup-piper.sh'

setup-piper.sh creates ~/piper/venv, installs piper-tts[http], downloads en_US-amy-medium into ~/piper/voices, installs and enables piper.service (loopback :5005), and smoke-tests it. Idempotent. Check it with systemctl status piper / journalctl -u piper -f.

Chinese runs as a second instance (piper-zh.service, :5006, zh_CN-huayan-medium):

scp deploy/piper-zh.service 192.168.1.212:~/.config/systemd/user/
ssh 192.168.1.212 'export XDG_RUNTIME_DIR=/run/user/$(id -u)
  ~/piper/venv/bin/python -m piper.download_voices zh_CN-huayan-medium --data-dir ~/piper/voices
  systemctl --user daemon-reload && systemctl --user enable --now piper-zh.service'

Petal's env then carries TTS_ENDPOINT=http://127.0.0.1:5005, TTS_ENDPOINT_ZH=http://127.0.0.1:5006 and the matching voice ids. The handler maps language → instance from config, so another language is another instance plus an env pair, no code change.

Piper version note: piper-tts moved synthesis from POST / to POST /synthesize in 1.6.0, with an identical request body. TTS_PATH selects which — it defaults to /, and both the VPS compose and millenia's start.sh now set /synthesize. If read-aloud starts returning 502 after a Piper upgrade, that flag is the fix.

The venv is fragile across Python upgrades. On 2026-07-27 millenia's Piper was found dead with 26,800+ failed restarts, silently since the Jul 26 reboot — read-aloud had been falling back to browser Web Speech the whole time. Root cause: an OS upgrade moved /usr/bin/python3 from 3.13 to 3.14, and venv/bin/python3 is a symlink to the system interpreter, so the venv's lib/python3.13/site-packages became invisible — sys.path contained no site-packages at all. The failure surfaced as the misleading No module named piper.http_server even though http_server.py was sitting right there on disk.

Fix (what was done — recreating the venv, not repairing it):

systemctl --user stop piper.service piper-zh.service
mv ~/piper/venv ~/piper/venv.broken-py313
python3 -m venv ~/piper/venv
~/piper/venv/bin/pip install "piper-tts[http]"
~/piper/venv/bin/python -c 'import piper.http_server'   # must not raise
systemctl --user start piper.service piper-zh.service

That reinstall lands 1.6.0, so it must be paired with TTS_PATH=/synthesize in start.sh and a binary new enough to read that variable. Voices in ~/piper/voices survive and do not need re-downloading.

Worth knowing: Restart=on-failure will retry forever without ever alerting. Neither service reports its health anywhere, which is why this went unnoticed for a day. A /api/tts probe in uptime-kuma would have caught it.

Verify end to end (through Petal, including the ffmpeg transcode):

curl -sf -X POST localhost:8088/api/tts \
  -H 'Content-Type: application/json' \
  -d '{"text":"hello there","lang":"en-US"}' -o /tmp/petal-tts.mp3 \
  && file /tmp/petal-tts.mp3   # expect: MPEG ADTS, layer III

A second identical call is served from the cache; a language with no configured instance returns 404 so the client falls back to Web Speech.