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.opencode/skills/devops/references/kubernetes-helm-advanced.md

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+# Helm Advanced - Templates & Hooks
+
+## Template Variables
+```yaml
+# templates/deployment.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "mychart.fullname" . }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  template:
+    spec:
+      containers:
+      - name: {{ .Chart.Name }}
+        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+        {{- if .Values.resources }}
+        resources:
+          {{- toYaml .Values.resources | nindent 10 }}
+        {{- end }}
+```
+
+## Helper Templates
+```yaml
+# templates/_helpers.tpl
+{{- define "mychart.fullname" -}}
+{{- printf "%s-%s" .Release.Name .Chart.Name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{- define "mychart.labels" -}}
+app.kubernetes.io/name: {{ .Chart.Name }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+```
+
+## Hooks
+```yaml
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: "{{ .Release.Name }}-post-install"
+  annotations:
+    "helm.sh/hook": post-install
+    "helm.sh/hook-delete-policy": hook-succeeded
+spec:
+  template:
+    spec:
+      containers:
+      - name: post-install
+        command: ["/bin/sh", "-c", "echo 'Done'"]
+      restartPolicy: Never
+```
+
+Hook types: `pre-install`, `post-install`, `pre-upgrade`, `post-upgrade`
+
+## Packaging
+```bash
+helm package mychart
+helm repo index . --url https://charts.example.com
+helm push mychart-1.0.0.tgz oci://registry.example.com/helm
+helm repo add myrepo https://charts.example.com
+helm install myapp myrepo/mychart
+```
+
+## Commands
+
+| Command | Purpose |
+|---------|---------|
+| `helm create` | Create |
+| `helm lint` | Validate |
+| `helm template` | Render |
+| `helm install` | Deploy |
+| `helm upgrade` | Update |
+| `helm rollback` | Revert |
+| `helm uninstall` | Remove |