Helm Scaffolding Skill

Scaffolds Helm charts for deploying SDD components to Kubernetes. Charts are generated based on component settings from sdd/sdd-settings.yaml.

Skills

Use the following skills for reference:

• techpack-settings — Authoritative source for helm component settings schema (deploys, deploy_type, deploy_modes, ingress, assets)

When to Use

Use when creating Helm chart components. Creates Helm charts that integrate with the SDD config system.

Settings-Driven Scaffolding

Helm charts are scaffolded based on their settings in sdd/sdd-settings.yaml. Delegate to the techpack-settings skill for the complete helm settings schema and defaults — it returns deploys (server reference), deploy_type, deploy_modes (array of mode strings), ingress (boolean), and assets (static file configuration).

Template Selection Logic

// Pseudocode for settings-driven template selection
const scaffoldHelmChart = async (helmComponent: HelmComponent): Promise<void> => {
  const { settings } = helmComponent;

  // Always include base templates
  await copyTemplate('_helpers.tpl');
  await copyTemplate('configmap.yaml');

  if (settings.deploy_type === 'server') {
    // Server-specific templates
    await copyTemplate('servicemonitor.yaml'); // All servers get metrics

    const deployModes = settings.deploy_modes ?? [serverSettings.server_type];

    if (deployModes.length > 1) {
      // Multiple modes = separate deployments per mode
      if (deployModes.includes('api')) await copyTemplate('deployment-api.yaml');
      if (deployModes.includes('worker')) await copyTemplate('deployment-worker.yaml');
      if (deployModes.includes('cron')) await copyTemplate('cronjob.yaml');
    } else if (deployModes[0] === 'cron') {
      await copyTemplate('cronjob.yaml');
    } else {
      await copyTemplate('deployment.yaml');
    }

    // Service only if deploying api mode and server provides contracts
    if (deployModes.includes('api') && serverSettings.provides_contracts.length > 0) {
      await copyTemplate('service.yaml');
    }
  } else {
    // Webapp templates
    await copyTemplate('deployment.yaml');
    await copyTemplate('service.yaml');
  }

  // Ingress from helm settings
  if (settings.ingress) {
    await copyTemplate('ingress.yaml');
  }
};

Directory Structure

Helm charts live at components/helm_charts/<name>/:

What It Creates

Server Chart Structure

components/helm_charts/<name>/
├── Chart.yaml                # Chart metadata
├── values.yaml               # Default values
└── templates/
    ├── _helpers.tpl          # Template helpers (always)
    ├── configmap.yaml        # Config mount (always)
    ├── servicemonitor.yaml   # Metrics integration (always)
    ├── deployment.yaml       # Single-mode deployment
    ├── deployment-api.yaml   # Hybrid: API mode deployment
    ├── deployment-worker.yaml # Hybrid: Worker mode deployment
    ├── cronjob.yaml          # Cron mode
    ├── service.yaml          # When provides_contracts (conditional)
    └── ingress.yaml          # When ingress: true (conditional)

Webapp Chart Structure

components/helm_charts/<name>/
├── Chart.yaml
├── values.yaml
└── templates/
    ├── _helpers.tpl
    ├── deployment.yaml       # nginx with config injection
    ├── service.yaml
    ├── configmap.yaml        # App config + nginx config
    └── ingress.yaml          # When ingress: true (conditional)

Umbrella Chart Structure

components/helm_charts/umbrella/
├── Chart.yaml                # Lists all charts as dependencies
└── values.yaml               # Enable/disable individual charts

Template Variables

Templates Location

Templates are organized by deployment target:

skills/components/helm/helm-scaffolding/
├── templates/                 # Legacy (single deployment)
├── templates-server/          # Server charts
│   ├── Chart.yaml
│   ├── values.yaml
│   └── templates/
│       ├── _helpers.tpl
│       ├── deployment.yaml
│       ├── deployment-api.yaml
│       ├── deployment-worker.yaml
│       ├── cronjob.yaml
│       ├── service.yaml
│       ├── ingress.yaml
│       ├── servicemonitor.yaml
│       └── configmap.yaml
├── templates-webapp/          # Webapp charts
│   ├── Chart.yaml
│   ├── values.yaml
│   └── templates/
│       ├── _helpers.tpl
│       ├── deployment.yaml
│       ├── service.yaml
│       ├── ingress.yaml
│       └── configmap.yaml
└── templates-umbrella/        # Umbrella chart
    ├── Chart.yaml
    └── values.yaml

Config Integration

Server Config Injection

Config is mounted as a file at /app/config/config.yaml. The application reads config using the SDD_CONFIG_PATH environment variable:

# templates/configmap.yaml
data:
  config.yaml: |
    {{- toYaml .Values.config | nindent 4 }}

The ConfigMap is mounted in deployments and SDD_CONFIG_PATH is set automatically.

Deployment workflow:

# Generate merged config
<plugin-root>/fullstack-typescript/system/system-run.sh config generate --env production --component main-server \
  --output production-config.yaml

# Deploy with config
helm install my-release ./components/helm_charts/main-server-api \
  -f values-production.yaml \
  --set-file config=production-config.yaml

Webapp Config Injection

Config is injected into HTML at deploy time via init container:

1. Webapp exports: export const startApp = (config: AppConfig) => { ... }
2. Helm chart's index.html has: startApp(__SDD_CONFIG__)
3. Init container replaces __SDD_CONFIG__ with JSON from ConfigMap
4. App receives config as parameter

Observability Integration

All server charts include:

• ServiceMonitor - Registers app with Prometheus/Victoria Metrics
• Metrics endpoint - Port 9090 for health/metrics
• Structured logging - JSON logs to stdout (collector picks up)

Cluster-level observability (Victoria Metrics, Victoria Logs) is set up separately (see task #47).

Scaffold Spec

To scaffold a Helm chart, build a spec with context flags derived from helm + server settings and invoke the engine:

<plugin-root>/fullstack-typescript/system/system-run.sh scaffolding apply --spec spec.json

Variables

Context Flags (derived from settings)

Example Spec (server chart)