jb-infra/README.md

# jb-infra

VPS edge stack for `joshbairstow.com`: a **caddy-docker-proxy** edge reverse
proxy (TLS + label-based routing) and a self-hosted **Forgejo** git server with
CI and a container registry. Everything else — `jb-website` and future side
projects — is deployed by CI and just attaches to the `edge` network and
declares routing labels.

```
[home desktop]                                  [Vultr VPS]
 Forgejo runner (host exec)                      docker network: edge (external)
  └ docker build  ───push image──►   ┌────────── edge-caddy   :80/:443  (TLS, routing)
  └ ssh deploy    ───pull+up─────►   ├────────── forgejo      git.joshbairstow.com (+registry)
                                     ├────────── jb-website   internal :80
                                     └────────── <future apps> e.g. shop.joshbairstow.com
```

## Why this shape

- **Edge proxy decouples projects.** Each project ships its own container with
  `caddy` labels; the edge picks them up automatically. Adding a project needs
  **zero edits here** — no central config to touch.
- **Build off-box.** The RAM-hungry Docker build runs on the always-on desktop
  runner; the VPS only pulls and runs prebuilt images, so it stays small.
- **Self-hosted git/CI** (Forgejo) — independent of GitHub/GitLab, with a cloud
  push-mirror kept only as backup.

---

## Bootstrap (one-time, in order)

Order matters — TLS issuance needs DNS + open ports first, and the `edge`
network must exist before any stack references it.

### 1. DNS
Point at the VPS public IP, and **wait for propagation** before step 4:
- `A  joshbairstow.com           → <VPS_IP>`
- `A  *.joshbairstow.com         → <VPS_IP>`   (wildcard covers blog/art/code/git + future)
- `AAAA` equivalents if the VPS has IPv6.

A wildcard record means new subdomains resolve with no DNS change; certs are
still issued per-host via HTTP-01, so no DNS-challenge plugin is required.

### 2. VPS base
```sh
# Install Docker Engine + compose plugin (official convenience script or distro pkg)
curl -fsSL https://get.docker.com | sh

# Firewall: allow only what we serve.
#   80, 443  -> edge proxy (HTTP/HTTPS, incl. ACME challenges)
#   222      -> Forgejo git-over-SSH
#   22       -> your normal host SSH (keep it!)
ufw allow 80,443/tcp && ufw allow 222/tcp && ufw allow OpenSSH && ufw enable
```
RAM: prefer the **2 GB** Vultr tier. On 1 GB, add swap first:
```sh
fallocate -l 2G /swapfile && chmod 600 /swapfile && mkswap /swapfile && swapon /swapfile
echo '/swapfile none swap sw 0 0' >> /etc/fstab
```

### 3. Create the shared network + bring up the stack
```sh
docker network create edge          # MUST exist before `up`
git clone <this repo> /opt/jb-infra && cd /opt/jb-infra
docker compose up -d
docker compose logs -f caddy        # watch the first cert issuance
```

### 4. Configure Forgejo
Browse to `https://git.joshbairstow.com` (cert should be live):
- Complete first-run setup; create your admin user with a **lowercase**
  username (the registry path is case-sensitive and must be lowercase).
- Confirm Actions is enabled (`Site Administration → Actions`).
- Create a **Personal Access Token** with **`write:package`** scope
  (`Settings → Applications`). The automatic Actions token CANNOT push packages.

### 5. Register the desktop runner
On the **home desktop** (has Docker + ssh):
```sh
# Get a registration token: Forgejo → Site Admin → Actions → Runners → Create
forgejo-runner register --no-interactive \
  --instance https://git.joshbairstow.com \
  --token <REGISTRATION_TOKEN> \
  --name desktop --labels desktop:host
forgejo-runner daemon --config /path/to/jb-infra/runner/config.yml
```
(For always-on, wrap the daemon in a systemd user service.) See
[`runner/config.yml`](runner/config.yml).

### 6. Wire the jb-website repo
In the `jb-website` repo settings on Forgejo (`Settings → Actions`):
- **Variables:** `REGISTRY_OWNER` = your lowercase owner.
- **Secrets:** `REGISTRY_USER`, `REGISTRY_TOKEN` (the PAT), `DEPLOY_HOST`,
  `DEPLOY_USER`, `DEPLOY_SSH_KEY`.

On the **VPS**, prepare the deploy target:
```sh
mkdir -p /opt/jb-website
# copy jb-website/compose.yml here (the production one — pulls, no build)
docker login git.joshbairstow.com      # one-time, so `compose pull` can read the package
# (or mark the jb-website package public in Forgejo to skip VPS login)
```
Create a restricted deploy user whose `authorized_keys` holds the public half
of `DEPLOY_SSH_KEY`.

### 7. First deploy
```sh
# in the jb-website repo (rename master→main first; see that repo's README)
git remote add origin git@git.joshbairstow.com:222/<owner>/jb-website.git
git push -u origin main
```
The push triggers `.forgejo/workflows/deploy.yml`: the desktop builds + pushes
the image, then SSHes to the VPS to `pull && up -d`. The edge issues certs for
the apex + subdomains on first request.

---

## Adding another project later

No changes to this repo. In the new project:
1. Ship a `compose.yml` on the VPS that joins the external `edge` network and
   carries labels, e.g.:
   ```yaml
   services:
     app:
       image: git.joshbairstow.com/<owner>/<app>:latest
       networks: [edge]
       labels:
         caddy: shop.joshbairstow.com
         caddy.reverse_proxy: "{{upstreams 3000}}"
   networks:
     edge:
       external: true
   ```
2. Give it its own `.forgejo/workflows/deploy.yml` (copy jb-website's).
3. `*.joshbairstow.com` already resolves, so the edge issues its cert
   automatically on first hit.

---

## Maintenance / hardening

- **Backups:** the `forgejo_data` volume is now the source of truth (repos, DB,
  registry blobs). Run `docker compose exec forgejo forgejo dump` on a schedule,
  and set a **push-mirror** on each repo to a cloud host (GitLab/GitHub) for
  off-box git backup.
- **Registry GC:** per-commit `:sha` tags accumulate. Enable Forgejo's package
  cleanup rules / run periodic GC so the VPS disk doesn't fill.
- **Certs:** never delete the `caddy_data` volume — losing it re-issues every
  cert and risks Let's Encrypt rate limits.
- **Least privilege:** restrict the deploy key in `authorized_keys` with a
  forced `command=` that only runs the compose pull/up script.
```