---
title: "Conduit — Operations Runbook"
type: runbook
tags:
  - mesh
aliases: []
related:
  - [[conduit]]
  - [[central]]
  - [[navi]]
updated: 2026-07-14
---

# Conduit — Operations Runbook

## When to use

Deploying a change, adding a pull source, provisioning an API key, or working the navi traffic-tile cutover/rollback for [[conduit]]. See [[conduit]] for architecture and current state.

## Key facts

| Item | Value |
|---|---|
| Host / SSH | utility CT 104 — `ssh zvx@100.64.0.12` |
| Deploy dir | `/opt/conduit` (owned `conduit:conduit`) |
| Virtualenv | `/opt/conduit/.venv` (uv-managed, editable install) |
| Systemd unit | `conduit.service` (single-worker — do NOT add `--workers`, single-flight is per-process) |
| DB / DSN env | `/etc/conduit/conduit.env` → `CONDUIT_DB_DSN` (own `conduit` DB on the shared Postgres 16) |
| Master key | `/etc/conduit/master.key` (`CONDUIT_MASTER_KEY_PATH`) |
| Deploy-key model | Pull-only: CT 104 pulls `main` via read-only deploy key `ct104-conduit-deploy`; cannot push (mirrors central) |
| Migration runner | `conduit-migrate` (forward-only SQL in `sql/migrations/*.sql`, tracked in `schema_migrations`) |
| Bind | `0.0.0.0:8010` (widened from loopback for the navi cutover, 2026-07-14) |

---

## Deploy a change

Run on CT 104 as `zvx`.

```bash
# 1. Pull latest main
sudo -u conduit git -C /opt/conduit fetch origin
sudo -u conduit git -C /opt/conduit checkout main
sudo -u conduit git -C /opt/conduit pull

# 2. Install (editable, picks up code + dep changes)
sudo -u conduit bash -c 'cd /opt/conduit && uv pip install -e ".[dev]"'

# 3. Preview then apply migrations
sudo -u conduit bash -c 'cd /opt/conduit && set -a && . /etc/conduit/conduit.env && set +a && /opt/conduit/.venv/bin/conduit-migrate --check'
sudo -u conduit bash -c 'cd /opt/conduit && set -a && . /etc/conduit/conduit.env && set +a && /opt/conduit/.venv/bin/conduit-migrate'

# 4. Restart
sudo systemctl restart conduit

# 5. Verify
systemctl is-active conduit
curl -sS -o /dev/null -w '%{http_code}\n' http://localhost:8010/health   # expect 200
curl -sS -o /dev/null -w '%{http_code}\n' http://localhost:8010/up/tomtom_flow_tiles/flow/8/48/95.pbf   # expect 200, a live tile
```

---

## Add a pull source

Sources are rows in the `sources` table — there is **no hot-reload**, `app.py` loads enabled sources once at startup. Any INSERT/UPDATE/DELETE requires a `systemctl restart conduit` to take effect.

Columns: `name`, `url_template`, `api_key_alias`, `ttl_seconds`, `header_auth`, `enabled`.

`url_template` contract: a Python `str.format()` template filled with two named substitutions —

- `{path}` — the upstream path only (no query string), taken from the inbound request after the source name and before the first `?`.
- `{key}` — the decrypted API key for `api_key_alias`, if set.

If the inbound request itself carries a query string, it's appended to the templated URL (`&` if the template already has its own `?`, else `?`) rather than substituted in — so caller-supplied params compose instead of colliding into a double `?`. If `header_auth` is true, the key is injected as a header instead of into the URL.

**Worked example — `tomtom_flow_tiles`:**

```bash
sudo -u conduit bash -c 'cd /opt/conduit && set -a && . /etc/conduit/conduit.env && set +a && psql "$CONDUIT_DB_DSN" -c "
INSERT INTO sources (name, url_template, api_key_alias, ttl_seconds, header_auth)
VALUES (
  '"'"'tomtom_flow_tiles'"'"',
  '"'"'https://api.tomtom.com/maps/orbis/traffic/tile/{path}?key={key}&apiVersion=1'"'"',
  '"'"'tomtom'"'"',
  60,
  false
)
ON CONFLICT (name) DO NOTHING;
"'

sudo systemctl restart conduit
```

---

## Provision an API key

API keys live in Conduit's own AES-256-GCM encrypted keystore (`api_keys` table), addressed by the `alias` a source's `api_key_alias` references — separate from central's keystore, encrypted under Conduit's own master key (`/etc/conduit/master.key`).

The pattern used for `tomtom`: the plaintext key was decrypted from central's `config.api_keys` and re-encrypted under Conduit's master key, in-process, never logged in plaintext. Use the same approach for any key that already lives in central; for a brand-new key, insert it directly through the keystore's encrypt path (no plaintext in shell history or logs).

---

## navi traffic-tile cutover (2026-07-14)

navi's `/api/traffic/` tiles were repointed from [[central]] to [[conduit]]. Exact change:

**On CT 104 — widen Conduit's bind:**

`conduit.service`'s `ExecStart` uvicorn flag was changed from loopback to mesh-reachable — `--host 127.0.0.1` → `--host 0.0.0.0` (the `--port 8010` is unchanged). Unit backed up first (see Rollback below), then:

```bash
# edit the ExecStart --host token in /etc/systemd/system/conduit.service:
#   --host 127.0.0.1  →  --host 0.0.0.0
sudo systemctl daemon-reload
sudo systemctl restart conduit
```

**On recon-vm — rewrite the nginx proxy:**

`/etc/nginx/sites-available/navi.echo6.co`, `location ^~ /api/traffic/` block changed to:

```nginx
location ^~ /api/traffic/ {
    rewrite ^/api/traffic/(.*)$ /up/tomtom_flow_tiles/$1 break;
    proxy_pass http://central.echo6.mesh:8010;
    # (existing tile-cache directives unchanged)
}
```

Then:

```bash
sudo nginx -t
sudo systemctl reload nginx
```

Verified via the real nginx path (curl through the vhost) plus fresh rows in Conduit's `payloads` table.

### Rollback

Both pre-cutover backups exist — restore them to revert:

```bash
# CT 104 — revert the unit
sudo cp /etc/systemd/system/conduit.service.bak-precutover /etc/systemd/system/conduit.service
sudo systemctl daemon-reload
sudo systemctl restart conduit

# recon-vm — revert nginx (back to :8000, no rewrite)
sudo cp /etc/nginx/sites-available/navi.echo6.co.bak-precutover /etc/nginx/sites-available/navi.echo6.co
sudo nginx -t
sudo systemctl reload nginx
```

[[central]] must stay running — it's the rollback target.

---

## Gotchas

- **Single-worker only.** Single-flight coalescing is per-process; adding uvicorn `--workers` breaks the "one upstream call" guarantee. Do not add workers.
- **`/up` rejects HEAD** (405) — GET only.
- **`/up` is unauthenticated**, like central's auth-exempt tile endpoints. Fine for tiles; revisit before adding sensitive sources.
- **No source hot-reload** — any `sources` table change needs `systemctl restart conduit`.
- **central must stay running** — it's the rollback target for the navi cutover, not a decommissioned dependency.
