Production design

Design the architecture of a production app.

Project: a production-ready deployment

You'll make the shop application from the intermediate project production-ready. To be added:

Database: a StatefulSet with a persistent disk and a headless service
External access: an Ingress with a domain name and HTTPS
Load: an HPA for the API
Security: an application-specific ServiceAccount and least privilege
Packaging: all the parts in a single Helm chart

magaza/
  Chart.yaml
  values.yaml
  values-prod.yaml
  templates/
    db-statefulset.yaml   db-service.yaml
    api-deployment.yaml   api-service.yaml   api-hpa.yaml
    web-deployment.yaml   web-service.yaml
    ingress.yaml          serviceaccount.yaml

Designing the values

A good values.yaml exposes everything likely to change and gives safe defaults for development; the production file only contains the differences:

# values.yaml
image:
  api: ghcr.io/ali/magaza-api
  tag: ""              # if empty, Chart.appVersion
api:
  replicas: 1
  autoscaling: {enabled: false, min: 2, max: 10, cpu: 70}
ingress:
  enabled: false
  host: magaza.local

# values-prod.yaml
api:
  autoscaling: {enabled: true}
ingress:
  enabled: true
  host: magaza.example.com

Exercise Production values

Write the contents of values-prod.yaml: api.autoscaling.enabled: true; under ingress, enabled: true and host: magaza.example.com; db.storage: 20Gi.

Show example solution

# values-prod.yaml
api:
  autoscaling:
    enabled: true
ingress:
  enabled: true
  host: magaza.example.com
db:
  storage: 20Gi

Test yourself

Where is it best to keep environment-specific differences (replica count, domain name)?
- In separate chart copies
- By entering the pods by hand
- In environment-specific values files (values-prod.yaml)
- Hard-coded inside the templates
Show answer

In environment-specific values files (values-prod.yaml) — The templates stay the same; only the values change.
Create the chart skeleton.
```
helm ____ magaza
```
Show answer
```
helm create magaza
```
Match.

StatefulSet

Database
Ingress

HTTPS and domain
HPA

API scaling
values-prod.yaml

Production differences

Next lesson: Database with StatefulSet

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