kubernetes资源对象由非helm升级为helm管理

由yaml文件部署的kubernetes资源对象，如何纳入helm chart的管理，同时能随着chart中对象的升级而升级？

一. 方法

首先，将资源对象纳入helm chart的管理：

# 修改对象的annotation 和 label
kubectl annotate --overwrite {kind} {obj} meta.helm.sh/release-name={release}
kubectl annotate --overwrite {kind} {obj} meta.helm.sh/release-namespace={namespace}
kubectl label --overwrite {kind} {obj} app.kubernetes.io/managed-by=Helm

然后，执行helm命令：

helm upgrade --install {release} .

二. demo

• 首先，yaml创建一个deploy对象，其image=nginx:1.21；
• 然后，修改deploy对象的annotation和label，将其纳入Helm chart的管理；
• 再后，创建helm chart，chart中部署deploy，其image=nginx:1.23；

• 最后：

  • 执行helm upgrade命令，确认deploy的image已升级至1.23；
  • 执行helm uninstall命令，确认deploy被随之删除；

yaml创建deploy对象

apiVersion: apps/v1
kind: Deployment
metadata:
  name: v1-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: nginx
      app.kubernetes.io/instance: v1
  template:
    metadata:
      labels:
        app.kubernetes.io/name: nginx
        app.kubernetes.io/instance: v1
    spec:
      containers:
        - name: nginx
          image: "nginx:1.21"        # image = nginx:1.21
          imagePullPolicy: IfNotPresent
          ports:
            - name: http
              containerPort: 80
              protocol: TCP

将deploy纳入helm chart的管理

kubectl annotate --overwrite deploy v1-nginx meta.helm.sh/release-name=v1
kubectl annotate --overwrite deploy v1-nginx meta.helm.sh/release-namespace=default
kubectl label --overwrite deploy v1-nginx app.kubernetes.io/managed-by=Helm

创建helm chart

# template/deploy.yaml
...
    spec:
      containers:
        - name: nginx          
          image: "nginx:1.23"
          imagePullPolicy: IfNotPresent
...

执行helm upgrade:

# helm upgrade --install v1 .
Release "v1" does not exist. Installing it now.
NAME: v1
LAST DEPLOYED: Tue Jan 31 15:52:03 2023
NAMESPACE: default
STATUS: deployed
REVISION: 1

验证deploy的image是否升级：

# kubectl get deploy v1-nginx -ojsonpath="{.spec.template.spec.containers[0].image}"
nginx:1.23

验证helm uninstall 后deploy是否删除：

# helm uninstall v1
release "v1" uninstalled

# kubectl get deploy