190 lines
9.2 KiB
Markdown
190 lines
9.2 KiB
Markdown
# Forgejo on the Swarm cluster
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Runs as `deploy/forgejo/docker-stack.yml` — the only Swarm-scheduled workload
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this cluster carries (the Thermograph app itself stays on the
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Terraform-managed `docker compose` deploys; see `terraform/README.md`).
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Pinned to the **beta** node (old VPS) via the `role=forge` label from
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`deploy/swarm/label-forge-node.sh`.
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The Actions **runner** is deliberately *not* part of this stack — it runs on
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the **desktop** as a plain systemd service (`register-lan-runner.sh` below),
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per `thermograph-docs/runbooks/implementation-handoff.md` Track B step 5. That's the
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canonical placement; an earlier revision of this stack ran the runner as a
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Swarm-scheduled Docker-in-Docker sidecar pinned to beta, which is gone now.
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## Prerequisites
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1. All three nodes have joined the swarm (`deploy/swarm/`) and beta is
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labeled `role=forge`.
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2. `docker node ls` (from the manager) shows all three `Ready`.
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## One-time setup: Swarm secret
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One secret the stack expects to already exist (a Swarm secret, not a file —
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`external: true` in the stack file, so `docker stack deploy` never creates or
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sees the value, only references it):
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```bash
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# A strong random password for Forgejo's own Postgres (NOT related to
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# Thermograph's app database — entirely separate instance/network).
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openssl rand -base64 32 | docker secret create forgejo_db_password -
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```
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## Deploy / update
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```bash
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docker stack deploy -c deploy/forgejo/docker-stack.yml forgejo
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```
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Re-running is safe — Swarm only touches services whose spec actually changed.
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Do this **before** the DNS + Caddy step below — Caddy's reverse_proxy target
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(`127.0.0.1:3080`) needs the `forgejo` service actually listening first, or
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its first health check just fails harmlessly until it is.
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This stack has **no auto-deploy trigger** — nothing in `.forgejo/workflows/`
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redeploys it on push. A change to `docker-stack.yml` only takes effect once
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someone re-runs `docker stack deploy` by hand on the manager (prod).
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`db`/`forgejo` both carry `resources.limits` (defaults: db 1 CPU/1g, forgejo 2
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CPU/2g — several times observed steady-state usage), overridable with
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`FORGEJO_DB_CPUS`/`FORGEJO_DB_MEMORY`/`FORGEJO_CPUS`/`FORGEJO_MEMORY` env vars
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before `docker stack deploy`, same convention as the app stack.
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## DNS + TLS: reusing beta's existing Caddy, not a second reverse proxy
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Forgejo is pinned to beta (`role=forge`) — but beta is also **today's live
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thermograph.org host**, and its Caddy already owns ports 80/443
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(`/etc/caddy/Caddyfile` on that box). A second ingress (Traefik) trying to
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bind the same ports would collide with it. So there's no Traefik in this
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stack: `forgejo`'s web port publishes to `127.0.0.1:3080` only (host-local),
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and beta's *existing* Caddy gets one more site block reverse-proxying to it —
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same pattern as its `thermograph.org` block, same automatic-HTTPS.
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1. Point the Forgejo domain (default `git.thermograph.org`; override with
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`FORGEJO_DOMAIN=...` before `docker stack deploy`) at **beta's** public IP
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— that's where the task actually runs, not prod's or the desktop's.
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2. Append `deploy/forgejo/caddy-git.conf` to beta's `/etc/caddy/Caddyfile`,
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adjusting the domain if you didn't use the default, then `systemctl reload
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caddy`.
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3. That file also resolves the registry-exposure hazard (#15 in
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`thermograph-docs/runbooks/hop1-forgejo-registry-cutover.md`): `/v2/*` (the registry
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API) is blocked to everything except the WireGuard mesh CIDR
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(`10.10.0.0/24`); the git/web UI stays public. CI runners and Swarm nodes
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reach the registry over the mesh, not the public internet — see "Registry
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access from mesh clients" below.
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## Registry access from mesh clients
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Any node that needs `docker login`/push/pull against the registry (the
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desktop's CI runner building/pushing images, later any Swarm node pulling
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them) must reach `git.thermograph.org` **over the WireGuard tunnel**, not
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beta's public IP — otherwise Caddy's `/v2/*` block above refuses the
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connection. Public DNS resolves the domain to beta's public IP, so add a
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`/etc/hosts` override on each such node pinning it to beta's WireGuard
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address instead:
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```
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echo "10.10.0.2 git.thermograph.org" | sudo tee -a /etc/hosts
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```
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(`10.10.0.2` is beta's WG address per `deploy/swarm/README.md`'s peer
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numbering — adjust if you assigned it differently.) The git/web UI keeps
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working normally for everyone else since only `/v2/*` is restricted.
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## Register the Actions runner (on the desktop, not through Swarm)
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Once Forgejo answers at its domain:
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```bash
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# On the desktop:
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# Forgejo web UI -> Site Administration -> Actions -> Runners -> Create new Runner
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# (or, for a repo-scoped runner: <repo> -> Settings -> Actions -> Runners)
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# copy the registration token, then:
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bash deploy/forgejo/register-lan-runner.sh https://<forgejo-domain> <token>
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```
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See that script's header for exactly what it replaces (the pre-Forgejo GitHub
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self-hosted runner on this same machine) and why it registers with two
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labels where there used to be two separate runners.
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`config.yaml`'s `runner.capacity` is raised from the tool's default of 1 to 8
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(override with `CAPACITY=`) — a single PR push fires `pr-build`,
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`secrets-guard`, and `shell-lint` simultaneously (3 independent workflows,
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no `needs:` between them), so capacity 1 serializes work that could run in
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parallel, and even capacity 3 (an earlier, undocumented hand-tune) leaves
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`build-backend`/`build-frontend`/`validate-observability` queued behind
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those three before they get a slot. The desktop has 16 cores / 34GB free
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today; 8 concurrent jobs is comfortable headroom without starving LAN dev's
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own compose stack.
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**Adding more runner capacity should mean raising this number, or adding a
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second runner on the desktop itself — not putting a runner on prod or
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beta.** `container.docker_host: automount` gives job containers the *host's*
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Docker socket; on prod or beta that would mean any CI job has root-equivalent
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access to whatever else is running there (the live app stack, or Forgejo
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itself). An earlier revision of this stack actually did run the runner as a
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Swarm-hosted container on beta and was deliberately reverted to the desktop
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for this reason — see the note at the top of `docker-stack.yml`.
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## Custom CI job image (`ci-runner/`)
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`ci-runner/Dockerfile` still bases on `node:20-bookworm` — Node is a hard
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requirement, not leftover: Forgejo's runner executes `actions/checkout@v4`
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(used by every workflow) as `node dist/index.js` *inside the job container*,
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regardless of whether the workflow itself uses npm/node. (v1 of this image
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tried a Node-free Debian-slim base and broke every job's checkout step —
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`node: executable file not found` — within a minute of going live; reverted
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immediately.) What it actually fixes: every `docker`-labeled build-push job
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currently re-installs the Docker CLI on each run (`apt-get install
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docker.io`), which pulls in the classic builder rather than BuildKit (the
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classic builder mishandles `COPY --chown=<name>` group resolution — a real
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bug hit during the frontend Go rewrite). `ci-runner` adds `docker-ce-cli` +
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`docker-buildx-plugin` (BuildKit) on top of the same Node base, plus
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`git`/`python3`/`python3-yaml` for the other jobs that need them
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(`shell-lint`, `observability-validate`).
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Current tag: `git.thermograph.org/emi/thermograph/ci-runner:v2` (`v1` is
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broken — do not register any runner against it). Rebuild/push (requires a PAT
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with `write:package` scope — the embedded git-remote token lacks it, same
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requirement documented in `backend-build-push.yml`):
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```bash
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docker build -t git.thermograph.org/emi/thermograph/ci-runner:vN deploy/forgejo/ci-runner
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docker push git.thermograph.org/emi/thermograph/ci-runner:vN
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```
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`register-lan-runner.sh`'s `LABELS` default points at the current tag, so
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fresh registrations pick it up automatically. The live runner is cut over by
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editing the `labels` array in `~/forgejo-runner/.runner` on the desktop (same
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runner id/token, no re-registration needed) and restarting the service —
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**verify a real job runs green under the new image before relying on it**,
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same way v1's break was caught. Only after that verification should the
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now-redundant `apt-get install docker.io` / `python3-yaml` steps be removed
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from the workflows that had them — removing them first would break every job
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still running on the stock `node:20-bookworm` image.
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## Why Postgres here and not the Thermograph app's TimescaleDB
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Separate instance, separate network (`forgejo_net`, not the app's compose
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network), separate volume. Forgejo is a distinct product with its own schema
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and its own backup/restore lifecycle — sharing a database with the app would
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couple two things that should be able to fail, migrate, and restore
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independently.
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## Verifying
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```bash
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docker service ls # forgejo_db, forgejo_forgejo both Running, 1/1
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curl -I https://git.thermograph.org/ # 200, valid cert (Caddy's, not a new one)
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curl -I https://git.thermograph.org/v2/ # 403 from anywhere off the WireGuard mesh
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# On the desktop, after registering the runner:
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systemctl --user status forgejo-runner # active, both labels registered
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```
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## Rollback / removal
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```bash
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docker stack rm forgejo
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# volumes (forgejo_data, forgejo_db, ...) survive a stack rm — remove them
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# explicitly only if you actually want to destroy the Forgejo instance's data.
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```
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