# 🎯 Complete Template-Based Configuration Summary

## Overview

RxMinder now supports **complete template-based configuration** with environment variables for all aspects of deployment, making it truly portable and customizable across any environment.

## 🔧 Configuration Variables

### Core Application

- **`APP_NAME`** - Application name used in all Kubernetes resources
- **`DOCKER_IMAGE`** - Container image to deploy
- **`INGRESS_HOST`** - External hostname for ingress

### Database Configuration

- **`COUCHDB_USER`** - Database username
- **`COUCHDB_PASSWORD`** - Database password (automatically base64 encoded)

### Storage Configuration

- **`STORAGE_CLASS`** - Kubernetes StorageClass for persistent volumes
- **`STORAGE_SIZE`** - Storage allocation for database

### Optional Configuration

- **`VITE_COUCHDB_URL`** - CouchDB URL for frontend
- **`APP_BASE_URL`** - Application base URL

## 📁 Template Files

All Kubernetes manifests are now template-based:

1. **`k8s/couchdb-secret.yaml.template`** - Database credentials (uses `stringData`)
2. **`k8s/couchdb-pvc.yaml.template`** - Persistent volume claim with configurable storage
3. **`k8s/couchdb-service.yaml.template`** - Database service with dynamic naming
4. **`k8s/couchdb-statefulset.yaml.template`** - Database deployment with storage config
5. **`k8s/configmap.yaml.template`** - Application configuration
6. **`k8s/frontend-deployment.yaml.template`** - Frontend with configurable image
7. **`k8s/frontend-service.yaml.template`** - Frontend service with dynamic naming
8. **`k8s/ingress.yaml.template`** - Ingress with configurable hostname

## 🎭 Environment Examples

### Development Environment

```bash
# .env
APP_NAME=rxminder-dev
DOCKER_IMAGE=localhost:5000/rxminder:dev
COUCHDB_USER=admin
COUCHDB_PASSWORD=dev-password-123
INGRESS_HOST=rxminder-dev.local
STORAGE_CLASS=local-path
STORAGE_SIZE=5Gi
```

### Staging Environment

```bash
# .env.staging
APP_NAME=rxminder-staging
DOCKER_IMAGE=registry.company.com/rxminder:staging
COUCHDB_USER=admin
COUCHDB_PASSWORD=staging-secure-password
INGRESS_HOST=staging.rxminder.company.com
STORAGE_CLASS=longhorn
STORAGE_SIZE=10Gi
```

### Production Environment

```bash
# .env.production
APP_NAME=rxminder
DOCKER_IMAGE=registry.company.com/rxminder:v1.2.0
COUCHDB_USER=admin
COUCHDB_PASSWORD=ultra-secure-production-password
INGRESS_HOST=rxminder.company.com
STORAGE_CLASS=fast-ssd
STORAGE_SIZE=50Gi
```

### Cloud Provider Examples

#### AWS EKS

```bash
APP_NAME=rxminder
DOCKER_IMAGE=123456789012.dkr.ecr.us-west-2.amazonaws.com/rxminder:v1.0.0
STORAGE_CLASS=gp3
STORAGE_SIZE=20Gi
INGRESS_HOST=rxminder.aws.company.com
```

#### Google GKE

```bash
APP_NAME=rxminder
DOCKER_IMAGE=gcr.io/project-id/rxminder:stable
STORAGE_CLASS=pd-ssd
STORAGE_SIZE=20Gi
INGRESS_HOST=rxminder.gcp.company.com
```

#### Azure AKS

```bash
APP_NAME=rxminder
DOCKER_IMAGE=myregistry.azurecr.io/rxminder:production
STORAGE_CLASS=managed-premium
STORAGE_SIZE=20Gi
INGRESS_HOST=rxminder.azure.company.com
```

## 🚀 Deployment Workflow

### Simple 3-Step Process

```bash
# 1. Configure environment
cp .env.example .env
nano .env  # Edit with your values

# 2. Deploy with single command
./scripts/k8s-deploy-template.sh deploy

# 3. Check status
./scripts/k8s-deploy-template.sh status
```

### Advanced Deployment Options

```bash
# Deploy with specific environment file
ENV_FILE=.env.production ./scripts/k8s-deploy-template.sh deploy

# Override specific variables
export DOCKER_IMAGE=my-registry.com/rxminder:hotfix
./scripts/k8s-deploy-template.sh deploy

# Cleanup deployment
./scripts/k8s-deploy-template.sh delete
```

## 🎯 Generated Resources

### Before (Hardcoded)

```yaml
# Old approach - static values
metadata:
  name: frontend
  labels:
    app: rxminder
spec:
  containers:
    - image: gitea-http.taildb3494.ts.net/will/meds:latest
  volumeClaimTemplates:
    - spec:
        storageClassName: longhorn
        resources:
          requests:
            storage: 1Gi
```

### After (Template-Based)

```yaml
# Template approach - dynamic values
metadata:
  name: ${APP_NAME}-frontend
  labels:
    app: ${APP_NAME}
spec:
  containers:
    - image: ${DOCKER_IMAGE}
  volumeClaimTemplates:
    - spec:
        storageClassName: ${STORAGE_CLASS}
        resources:
          requests:
            storage: ${STORAGE_SIZE}
```

### Deployed Result

```yaml
# After envsubst processing
metadata:
  name: rxminder-frontend
  labels:
    app: rxminder
spec:
  containers:
    - image: registry.company.com/rxminder:v1.0.0
  volumeClaimTemplates:
    - spec:
        storageClassName: fast-ssd
        resources:
          requests:
            storage: 20Gi
```

## 🔄 CI/CD Integration

### GitHub Actions

```yaml
name: Deploy to Kubernetes
on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Deploy to Production
        env:
          APP_NAME: rxminder
          DOCKER_IMAGE: ghcr.io/${{ github.repository }}:${{ github.sha }}
          COUCHDB_PASSWORD: ${{ secrets.COUCHDB_PASSWORD }}
          INGRESS_HOST: rxminder.company.com
          STORAGE_CLASS: fast-ssd
          STORAGE_SIZE: 50Gi
        run: |
          ./scripts/k8s-deploy-template.sh deploy
```

### GitLab CI

```yaml
deploy_production:
  stage: deploy
  variables:
    APP_NAME: rxminder
    DOCKER_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
    STORAGE_CLASS: longhorn
    STORAGE_SIZE: 20Gi
  script:
    - ./scripts/k8s-deploy-template.sh deploy
  only:
    - tags
```

## 💡 Benefits Achieved

### 🎯 Flexibility

- ✅ **Multi-environment** deployments with same codebase
- ✅ **Cloud-agnostic** configuration
- ✅ **Registry-agnostic** image deployment
- ✅ **Storage-flexible** for any Kubernetes cluster

### 🔒 Security

- ✅ **No hardcoded credentials** in version control
- ✅ **Environment-specific secrets** management
- ✅ **Automatic base64 encoding** via Kubernetes `stringData`
- ✅ **Credential validation** before deployment

### 🛠️ Developer Experience

- ✅ **Single command deployment** across all environments
- ✅ **Clear documentation** of all configuration options
- ✅ **Environment validation** with helpful error messages
- ✅ **Template debugging** with manual `envsubst` testing

### 🏢 Enterprise Ready

- ✅ **Production-grade** configuration management
- ✅ **CI/CD integration** ready
- ✅ **Multi-cluster** deployment support
- ✅ **Disaster recovery** friendly with consistent configs

## 🎪 Use Cases

### Multi-Tenant Deployment

```bash
# Tenant A
export APP_NAME=rxminder-tenant-a
export INGRESS_HOST=tenant-a.rxminder.company.com
./scripts/k8s-deploy-template.sh deploy

# Tenant B
export APP_NAME=rxminder-tenant-b
export INGRESS_HOST=tenant-b.rxminder.company.com
./scripts/k8s-deploy-template.sh deploy
```

### Blue-Green Deployment

```bash
# Blue environment
export APP_NAME=rxminder-blue
export DOCKER_IMAGE=registry.com/rxminder:v1.0.0
./scripts/k8s-deploy-template.sh deploy

# Green environment
export APP_NAME=rxminder-green
export DOCKER_IMAGE=registry.com/rxminder:v2.0.0
./scripts/k8s-deploy-template.sh deploy
```

### Development Branches

```bash
# Feature branch deployment
export APP_NAME=rxminder-feature-auth
export DOCKER_IMAGE=registry.com/rxminder:feature-auth
export INGRESS_HOST=auth-feature.rxminder.dev.company.com
./scripts/k8s-deploy-template.sh deploy
```

This **complete template-based approach** makes RxMinder the most **flexible**, **secure**, and **maintainable** medication reminder application for Kubernetes deployments!