# Deployment — redeploy to `cochi`

Production host for the Ulicraft stack.

| | |
|---|---|
| Host | `cochi` (SSH alias) |
| Path | `/home/ubuntu/mc/ulicraft-server-v1` |
| Branch | `main` |
| Compose | single `docker-compose.yml` (no overrides) |
| Auth | Drasl (password login) |
| Ingress | host nginx (Let's Encrypt TLS) → caddy → services (see 15-letsencrypt.md) |
| Restart | **hard** (`compose down` → `compose up --build`) — brief full downtime |

## Routine redeploy

`update-all.sh` (repo root) is the **single source of truth** for the post-pull
build + restart steps. Run it AFTER a `git pull` (it never pulls or pushes).
Strict halt on any error — never a partial deploy.

Two modes:

- `./update-all.sh` — **rolling**: `docker compose up -d --build`, then restart
  ONLY the services whose mounted inputs changed since a pre-run snapshot
  (drasl/nmsr on a config re-render, minecraft on a mod change). Minimal
  downtime. Does **not** detect caddy static-conf (`caddy/conf.d/*.caddy`)
  changes — apply those with a **recreate**, not a reload/restart (see gotcha
  below): `docker compose up -d --force-recreate caddy` (no world downtime), or
  `--hard` for a full redeploy.

  > **Caddy conf bind mounts are inode-pinned — recreate, don't reload.** Each
  > `caddy/conf.d/*.caddy` is a *single-file* bind mount, which Docker pins to
  > the host file's inode at container creation. `git pull` rewrites a tracked
  > file via atomic rename = a NEW inode, so the running container keeps the OLD
  > config. `docker compose restart caddy` and `caddy reload` reuse the same
  > container → same stale inode → no effect. Only re-creating the container
  > (`up -d --force-recreate caddy`, or the `--hard` down/up) re-resolves the
  > mount. Verify: `docker compose exec caddy cat /etc/caddy/conf.d/<file>`.
- `./update-all.sh --hard` — `docker compose down --remove-orphans && up -d
  --build`. Full restart (Minecraft world downtime); picks up everything.

One-shot full redeploy from your workstation (the `deploy` skill does exactly
this):

```bash
ssh cochi 'set -e
  cd /home/ubuntu/mc/ulicraft-server-v1
  git pull --ff-only
  tooling/fetch-authlib.sh        # ensure authlib jar (rarely changes; NOT in update-all)
  ./update-all.sh --hard'
```

Everyday landing/config tweak (no world downtime):

```bash
ssh cochi 'cd /home/ubuntu/mc/ulicraft-server-v1 && git pull --ff-only && ./update-all.sh'
```

Steps `update-all.sh` runs, in order: `render-config.sh` (drasl/nmsr from `.env`;
halts on a bad `REGISTRATION_MODE`) → `sync-server-mods.sh` (mirror the
`both`/`server` subset from `mods-sides.json` out of `$DISTRIBUTION_WEB_ROOT`
into `./server-mods`) → `build-modlist.py` (regen landing `mods.json` + logos;
**run under `python>=3.11`** — cochi's default `python3` is 3.10, but
`python3.11` is installed and the script auto-selects it) → landing `pnpm build`
(sources nvm + `.env`, never `npm`) → docker compose. `$DISTRIBUTION_WEB_ROOT`
must resolve on the host (it also backs the caddy `distribution.` mount).

### Landing site + mod list (generated, not in git)

Both the static site `www/` AND the landing `mods.json` are gitignored — a `git
pull` never updates them. `update-all.sh` regenerates both every run
(`mods.json` via `build-modlist.py`, `www/` via `pnpm build`). A flag-only
`REGISTRATION_MODE` change just needs a rolling `./update-all.sh`: it rebuilds
`www/` (bakes the invite-field on/off) and restarts `drasl` only if
`render-config.sh` changed its config (Drasl's `RequireInvite`/CORS/RateLimit) —
no world downtime.

## Known host-local divergence on `cochi` (uncommitted)

`cochi` carries deliberate local edits that are **not in the repo**, so
`git pull --ff-only` **aborts** ("local changes would be overwritten") whenever
an incoming commit also touches `docker-compose.yml`. As of 2026-06-09 the host
has, uncommitted:

- `docker-compose.yml` — internal URLs forced `http`→`https`
  (`JVM_OPTS` authlib-injector), for the in-container HTTPS path. (The old
  `PACKWIZ_URL` divergence is moot — packwiz was removed; see `04-mods.md`.)
- `dnsmasq/` (new), `caddy/caddy-root-ca.crt`, `landing/pnpm-workspace.yaml` —
  internal DNS + private CA so containers resolve/trust `https://auth.` etc.
- `landing/package.json` modified. (The former `pack/` divergence is resolved —
  `pack/` and `custom/` were deleted with the packwiz removal.)

**Do not steamroll it.** Before a deploy that edits `docker-compose.yml`, either:
1. **Converge** — commit the host edits to `main` + push, then a clean ff-pull
   deploys (preferred — ends the divergence). The https/dnsmasq/CA setup belongs
   in the repo.
2. **Stash–pull–pop** — `git stash` → `git pull --ff-only` → `git stash pop`.
   Non-destructive; safe only when the incoming and host edits are in different
   regions of the file. Stop on a pop conflict.

Never `git reset --hard` / discard on the host without confirming first.

## What survives a hard restart

Named volumes persist — world and auth data are safe:
- `mc_data` — world + installed NeoForge/mods
- `drasl_state` — Drasl accounts/skins
- `kuma_data` — Uptime Kuma config/history
- `backups/` — mc-backup snapshots

`down` removes **containers**, not volumes. Players are disconnected during the
restart (a few minutes); they reconnect once `minecraft` is healthy again.

## Prerequisites (one-time, on `cochi`)

- SSH access as the `cochi` alias.
- `.env` present and complete: `BASE_DOMAIN`, `RCON_PASSWORD`, `CADDY_HTTP_PORT`,
  `CADDY_HTTP_BIND`, `DISTRIBUTION_WEB_ROOT`, `REGISTRATION_MODE` (`invite`|`open`,
  defaults `invite`), and the Let's Encrypt block (`render-config.sh` halts on an
  unset `BASE_DOMAIN` or an invalid `REGISTRATION_MODE`).
- Docker + compose plugin, `envsubst`, `jq` (used by `sync-server-mods.sh`;
  falls back to `python3` if absent), `git`.
- Host nginx + Let's Encrypt certs installed once — see `15-letsencrypt.md`.
- **First deploy only** — online prep (build landing, fetch launcher, fetch
  authlib into `runtime/`). Not needed for routine redeploys.

## Verify

```bash
docker compose ps      # caddy, drasl, minecraft, mc-backup, nmsr, mc-status, uptime-kuma up
# self-hosted live status feed (plan/15-mc-status.md):
curl -fsS "https://$(grep '^BASE_DOMAIN=' .env | cut -d= -f2)/api/mcstatus/v2/status/java/$(grep '^BASE_DOMAIN=' .env | cut -d= -f2)" | jq .online
docker compose logs -f minecraft   # watch for "Done"
curl -fsS "https://auth.$(grep '^BASE_DOMAIN=' .env | cut -d= -f2)/" >/dev/null && echo "auth ok"
```

## Rollback

```bash
git log --oneline -5            # find the last-good commit
git checkout <sha>              # or: git reset --hard <sha>
docker compose down --remove-orphans
docker compose up -d --build
```

## Notes

- Production needs internet on `cochi` at restart: the server installs/re-syncs
  NeoForge + mods over the network.
- All ingress goes through host nginx → caddy. After a redeploy, nginx config is
  unchanged; only re-run `tooling/render-nginx.sh --install` if `BASE_DOMAIN` /
  `CADDY_HTTP_PORT` changed (see `15-letsencrypt.md`).