Files

T

fix(docker): drop inherited VOLUME /srv/www that caused silent stale deploys

VOLUME ["/srv/www"] created an anonymous volume that docker compose reuses across
container recreation, shadowing a freshly COPY'd SPA bundle with the previous build
— up -d --build exited 0 while serving the old bundle (and poisoned the PWA service
worker's ngsw.json). A child image cannot un-declare an inherited VOLUME, so it must
not be declared: removing it makes the COPY case deterministic and leaves the runtime
bind-mount case unaffected. Also refreshed the README FROM tag v1.0.0 -> v1.6.0.

2026-08-18 17:27:04 -06:00

2.6 KiB

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einherjar/spa-server

A shield wall holds because every warrior knows their position. The SPA asks only for the wall — not for every soldier's name.

code.nochebuena.dev/einherjar/spa-server is a container-first HTTP server for single-page applications and progressive web apps. It serves static assets directly and falls back to index.html for any path that does not resolve to a file on disk — the standard SPA routing contract.

The module ships as a ready-to-use Docker base image. Deploying a SPA to a container requires a single COPY instruction. No nginx, no custom configuration, no index.html redirect logic to maintain.

Container usage

FROM code.nochebuena.dev/einherjar/spa-server:v1.6.0
COPY dist/ /srv/www/

That is the complete Dockerfile for a production SPA container.

Environment variables

Variable	Default	Description
`EINHERJAR_SPA_PORT`	`8080`	TCP port the server listens on
`EINHERJAR_SPA_STATIC_DIR`	`/srv/www`	Path to the directory containing `index.html` and assets
`EINHERJAR_LOG_LEVEL`	`INFO`	Log level: `DEBUG`, `INFO`, `WARN`, `ERROR`

Health endpoint

GET /health returns 200 OK with a JSON body consistent with all Einherjar health responses:

{"status":"UP","components":{}}

503 Service Unavailable is never returned — if the process is alive, it is healthy. Wire /health directly to your container liveness and readiness probes.

Routing behaviour

Request	Result
`/app.js` — file exists	Served directly with correct `Content-Type`
`/assets/logo.png` — file exists	Served directly
`/dashboard` — no matching file	`index.html` served (SPA router handles it)
`/` — directory	`index.html` served (directory listing is disabled)

Dependency graph

contracts  (zero dependencies)
    ↑
  core
    ↑
spa-server  (contracts, core, stdlib only)

No external dependencies beyond the Go standard library.

Verification

cd spa-server/
go build ./...
go vet ./...
go test ./...
gofmt -l .

A shield wall holds because every warrior knows their position. The SPA asks only for the wall — not for every soldier's name.

2.6 KiB Raw Blame History