# Investigation: Caddyfile truncation — all LAN services down (2026-06-06)

**Date:** 2026-06-06
**Status:** resolved
**Duration:** ~10 hours (from last known good state ~12:39 UTC to restoration ~22:40 UTC)

## Symptom

All `*.hubris.network` URLs except `photos.hubris.network` and `auth.hubris.network` returned `tlsv1 alert internal error` or TCP timeouts from LAN/mesh clients. `dig @192.168.8.2` and `dig @100.122.255.254` both resolved to `192.168.8.175` correctly — DNS was fine. The issue was at the Caddy level.

## Root cause

The Caddyfile on LXC 121 was manually edited directly on the filesystem (not via the `dtoro/caddy-conf` git repo), reducing it from 260 lines/30+ site blocks to 43 lines with only 3 photo-related site blocks: `photos.hubris.network`, `prism.hubris.network`, and `photos2.hubris.network`.

### Timeline

| Time (UTC+2) | Event |
|---|---|
| Jun 04 23:43 | Last successful git-push deploy — full Caddyfile (260 lines) |
| Jun 06 ~12:00 | Caddyfile manually edited locally, truncating to 3 sites |
| Jun 06 12:39 | Deploy webhook triggered → `git pull --ff-only` failed: "Your local changes would be overwritten" |
| Jun 06 14:13 | Deploy webhook triggered again → `deploy ok` (the truncated file was committed or merged somehow) |
| Jun 06 22:34 | Investigation began |
| Jun 06 22:43 | Caddyfile restored from `origin/master`, `systemctl reload caddy` |

### Evidence

- `git diff HEAD -- Caddyfile` on LXC 121: `+3 / -159` lines
- Git reflog: HEAD at `32575ce` (fix: sab port 8081→8082), working tree diverged
- Backup file `Caddyfile.bak.1780263919`: 225 lines, full original config
- `git stash list` shows one auto-stash entry
- `origin/master` at `1b977aa`: 260 lines, all site blocks present

### Secondary root cause found during investigation

**elementsynapse (LXC 118)** had `iface eth0 inet dhcp` internally despite `pct set 118 --net0 ... ip=192.168.8.239/24`. On DHCP lease renewal, dhclient grabbed `.244` from Technitium's pool. Caddy's `reverse_proxy 192.168.8.239:8008` was hitting a dead IP.

This is the same class of drift as the June 5th incidents (paperless, HAOS, apps, mule-images). Elementsynapse was missed during the 2026-06-02 static-IP migration.

## Fix applied

1. **Caddyfile** → `git checkout --force origin/master -- Caddyfile` + `systemctl reload caddy`
2. **elementsynapse** → replaced `iface eth0 inet dhcp` with static, killed dhclient, verified connectivity

## Permanent safeguards (all deployed)

| Safeguard | Location | What it does |
|---|---|---|
| Site-count guard | `/etc/caddy/scripts/deploy.sh` | Refuses reload if <20 `hubris.network` site blocks |
| Dirty-tree auto-stash | `/etc/caddy/scripts/deploy.sh` | Stashes local edits before git pull |
| Auto-backup | `/etc/caddy/scripts/deploy.sh` | Saves Caddyfile.bak.<timestamp> before any change, keeps 5 |
| Caddy backend health | `/etc/cron.d/caddy-backend-health` on hubris | Runs `check-caddy-backends.sh` every 10 min |
| DNS sync | `/etc/cron.d/dns-sync` on LXC 107 | Runs `dns-sync.py` every 10 min (was missing since 2026-06-04) |

## Related

- DHCP drift investigation (previous incident) — not filed as its own investigation; see the [DNS sync fix](../../../.hermes/plans/2026-06-05_170000-prevent-dhcp-ip-drift.md)
- [Caddy (121)](../../wiki/containers/121-caddy.md)
- [elementsynapse (118)](../../wiki/containers/118-elementsynapse.md)
- [dns-sync script](../../../scripts/dns-sync.py)
- [check-caddy-backends script](../../../scripts/check-caddy-backends.sh)