新 kubernetes kustomize 支持中的变量替换（自 1.14.0 起）：kubectl apply -k ./

Question

我们以这种方式将 kustomize 用于我们的 kubernetes 部署：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:${IMAGE_VERSION}
        ports:
        - containerPort: 80

并部署此 yaml，将变量 IMAGE_VERSION 替换为 1.7.9

kustomize build ./nginx/overlays/dev/ | sed -e 's|${IMAGE_VERSION}'"|1.7.9|g" | kubectl apply -f -

因为 kubectl 1.14 支持 kustomize。

现在我们可以做一些非常棒的事情了

kubectl apply -k ./

但是如何用这个新命令替换 IMAGE_VERSION 变量？

Answer 1

您必须创建一个包含自定义项的kustomization.yaml 文件。

即：

# kustomization.yaml
bases:
- ../base
images:
  - name: nginx-pod
    newTag: 1.15
    newName: nginx-pod-2

对于模板，您创建一个包含 kustomization.yaml 并参考部署和依赖项的基本文件夹，即：

# ../base/kustomization.yaml
resources:
- deployment.yaml

和

# ../base/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx-pod

运行命令：

kubectl apply -k

上面的命令将编译定制并生成以下 yaml 应用到集群：

# Modified Base Resource
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      # The image image tag has been changed for the container
      - name: nginx
        image: nginx-pod-2:1.15