Kubernetes kustomize

Overview

Kustomize 내용 정리.

Kustomize does customize raw, template-free YAML files for multiple purposes, leaving the original YAML untouched and usable as-is.

Basic

Kustomize is a standalone tool to customize Kubernetes objects through a kustomization file.

Since 1.14, Kubectl also supports the management of Kubernetes objects using a kustomization file. To view Resources found in a directory containing a kustomization file, run the following command.

$ kubectl kustomize <kustomization_directory>

$ kubectl kustomize ./k8s
apiVersion: v1
kind: Service
metadata:
  labels:
    app: simple-golang
  name: svc-cluster-simple-golang
spec:
  ports:
  - name: http
    port: 8090
    protocol: TCP
    targetPort: 8090
  selector:
    app: simple-golang
  type: ClusterIP
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: simple-golang
  name: svc-nodeport-simple-golang
spec:
  ports:
  - port: 8090
    protocol: TCP
  selector:
    app: simple-golang
  type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: simple-golang
  name: simple-golang
spec:
  replicas: 1
  selector:
    matchLabels:
      app: simple-golang
  template:
    metadata:
      labels:
        app: simple-golang
        deployment: simple-golang
    spec:
      containers:
      - image: simple_golang_k8s:latest
        name: simple-golang
        ports:
        - containerPort: 8090
        resources:
          limits:
            cpu: "1"
            memory: 256M
          requests:
            cpu: 100m
            memory: 128M
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  labels:
    app: simple-golang
  name: ingress-simple-golang
spec:
  backend:
    serviceName: svc-nodeport-simple-golang
    servicePort: 8090
  rules:
  - host: foo.mydomain.com
    http:
      paths:
      - backend:
          serviceName: svc-nodeport-simple-golang
          servicePort: 8090

To apply those Resources, run kubectl apply with --kustomize or -k flag.

$ kubectl apply -k <kustomization_directory>

See also

• https://blog.stack-labs.com/code/kustomize-101/ - Kustomize - The right way to do templating in Kubernetes