helm-values

# Helm Values

Managing values files and configuration overrides in Helm.

## Values Hierarchy

Helm merges values from multiple sources (lower precedence first):

1. Built-in default values
2. Chart's `values.yaml`
3. Parent chart's values
4. Values files specified with `-f` (can be multiple)
5. Individual parameters with `--set`

## values.yaml Structure

### Organize by Resource

```yaml
# Global settings
global:
  environment: production
  domain: example.com

# Application settings
app:
  name: myapp
  version: "1.0.0"

# Image settings
image:
  repository: myregistry/myapp
  pullPolicy: IfNotPresent
  tag: ""  # Overrides appVersion

# Service settings
service:
  type: ClusterIP
  port: 80
  targetPort: 8080

# Ingress settings
ingress:
  enabled: false
  className: nginx
  annotations: {}
  hosts:
    - host: myapp.example.com
      paths:
        - path: /
          pathType: Prefix
  tls: []

# Resources
resources:
  limits:
    cpu: 500m
    memory: 512Mi
  requests:
    cpu: 250m
    memory: 256Mi

# Persistence
persistence:
  enabled: false
  storageClass: ""
  accessMode: ReadWriteOnce
  size: 8Gi
```

## Override Strategies

### Override with File

```bash
# Single file
helm install myrelease ./mychart -f custom-values.yaml

# Multiple files (later files override earlier)
helm install myrelease ./mychart \
  -f values-base.yaml \
  -f values-production.yaml
```

### Override with --set

```bash
# Single value
helm install myrelease ./mychart --set image.tag=2.0.0

# Multiple values
helm install myrelease ./mychart \
  --set image.tag=2.0.0 \
  --set replicaCount=5

# Nested values
helm install myrelease ./mychart \
  --set ingress.enabled=true \
  --set ingress.hosts[0].host=myapp.com
```

### Override with --set-string

```bash
# Force string type (useful for numeric-looking strings)
helm install myrelease ./mychart \
  --set-string version="1.0"
```

### Override with --set-file

```bash
# Read value from file
helm install myrelease ./mychart \
  --s