Cloud Intermediate

Helm Charts from Scratch¶

HelmKubernetesPackage Manager 3 min read

Kubernetes package manager. Vytvoření, konfigurace a nasazení Helm chartů.

Basics¶

# Vytvoř nový chart
helm create myapp
# Struktura:
# myapp/
#   Chart.yaml      # Metadata
#   values.yaml     # Default konfigurace
#   templates/       # K8s manifesty s templating
#     deployment.yaml
#     service.yaml
#     ingress.yaml

values.yaml a templating¶

# values.yaml
replicaCount: 3
image:
  repository: myapp
  tag: v1.0.0
service:
  type: ClusterIP
  port: 80

# templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
spec:
  replicas: {{ .Values.replicaCount }}
  template:
    spec:
      containers:
        - name: {{ .Chart.Name }}
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          ports:
            - containerPort: {{ .Values.service.port }}

Commands¶

helm install myapp ./myapp -f prod-values.yaml
helm upgrade myapp ./myapp --set image.tag=v2.0.0
helm rollback myapp 1
helm list
helm uninstall myapp

Summary¶

Helm je de facto standard pro K8s packaging. Používejte values.yaml pro environment-specific konfigurace.

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