node-express

Node.js (Express) on Rune

A minimal stateless Express service, with its configuration injected from a Rune configmap as environment variables.

browser/client ──▶ node-hello ×2 (express)  [namespace: demo]
                   expose: node-hello.local      env ← configmap

What it demonstrates: a stateless HTTP service plus envFrom — keys in the node-hello-settings configmap land in the container as env vars, so config changes don't require an image rebuild.

Prerequisites

• A running runed and configured rune CLI (quick start).
• Docker.

1. Build

docker build -t node-hello:dev ./app

2. Deploy

rune lint deploy/app.yaml
rune cast deploy/app.yaml
rune get services -n demo

3. Verify

echo "127.0.0.1 node-hello.local" | sudo tee -a /etc/hosts

curl http://node-hello.local/api/hello
# {"message":"hello from node on rune","instance":"f6e5d4c3b2a1"}

In dev mode the ingress binds :8080, so use http://node-hello.local:8080.

4. Change config without rebuilding

rune create config node-hello-settings -n demo --from-literal=GREETING="howdy from a configmap"
rune restart node-hello -n demo      # instances pick up env on restart

curl http://node-hello.local/api/hello
# {"message":"howdy from a configmap", ...}

5. Tear down

rune delete -f deploy/app.yaml