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devops/orchestration/helm-charts/references/helm-commands.md

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+# Helm Commands Reference
+
+## Chart Management
+
+```bash
+# Create new chart
+helm create mychart
+
+# Lint chart
+helm lint mychart/
+
+# Package chart
+helm package mychart/
+
+# Template (render without installing)
+helm template myrelease mychart/ --values values.yaml
+```
+
+## Repository
+
+```bash
+# Add repo
+helm repo add bitnami https://charts.bitnami.com/bitnami
+helm repo add stable https://charts.helm.sh/stable
+
+# Update repos
+helm repo update
+
+# Search
+helm search repo nginx
+helm search hub nginx
+```
+
+## Installation
+
+```bash
+# Install
+helm install myrelease mychart/
+helm install myrelease bitnami/nginx --namespace prod --create-namespace
+
+# With values
+helm install myrelease mychart/ -f values.yaml
+helm install myrelease mychart/ --set image.tag=v1.0
+
+# Dry run
+helm install myrelease mychart/ --dry-run --debug
+
+# Wait for completion
+helm install myrelease mychart/ --wait --timeout 5m
+```
+
+## Upgrade & Rollback
+
+```bash
+# Upgrade
+helm upgrade myrelease mychart/ -f values.yaml
+helm upgrade --install myrelease mychart/  # Install or upgrade
+
+# Rollback
+helm rollback myrelease 1  # Rollback to revision 1
+helm rollback myrelease    # Previous revision
+
+# History
+helm history myrelease
+```
+
+## Management
+
+```bash
+# List releases
+helm list
+helm list -A  # All namespaces
+helm list --pending
+
+# Get info
+helm get values myrelease
+helm get manifest myrelease
+helm get all myrelease
+
+# Status
+helm status myrelease
+
+# Uninstall
+helm uninstall myrelease
+helm uninstall myrelease --keep-history
+```
+
+## Chart Structure
+
+```
+mychart/
+├── Chart.yaml          # Chart metadata
+├── values.yaml         # Default values
+├── charts/             # Dependencies
+├── templates/
+│   ├── NOTES.txt       # Post-install notes
+│   ├── _helpers.tpl    # Template helpers
+│   ├── deployment.yaml
+│   ├── service.yaml
+│   └── ingress.yaml
+└── .helmignore
+```
+
+## Template Functions
+
+```yaml
+# Built-in functions
+{{ .Values.image.tag | default "latest" }}
+{{ .Release.Name | upper }}
+{{ include "mychart.fullname" . }}
+
+# Conditionals
+{{- if .Values.ingress.enabled }}
+# ingress config
+{{- end }}
+
+# Loops
+{{- range .Values.hosts }}
+- host: {{ . }}
+{{- end }}
+```