---
#定義nginx命名空間
apiVersion: v1
kind: Namespace
metadata:
  name: k8s-nginx           #自定義的命名空間

---
#定義nginx service
apiVersion: v1
kind: Service
metadata:
  name: k8s-nginx
  namespace: k8s-nginx
  labels:
    app: k8s-nginx
spec:
  type: NodePort
  ports:
  - port: 80                             #分配集群ip的端口
    targetPort: 80                   #分配pod端口
    nodePort: 10280              #node節點端口
    protocol: TCP
  clusterIP: 169.169.249.80   #分配集群ip
  selector:
   app: k8s-nginx

---
#創建 deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deploy
  namespace: k8s-nginx
  labels:
    app: k8s-nginx
spec:
  replicas: 2            #生成復本數量為2
  selector:
    matchLabels:
      app: k8s-nginx
  template:
    metadata:
      labels:
        app: k8s-nginx
      annotations:
        app: nginx-clouster
    spec:
      containers:
      - name: nginx
        image: docker.io/nginx
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            cpu: 300m
            memory: 3000Mi
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 80
 

如果要修改nginx.yaml文件,二種方式
第一種:
直接修改 nginx.yaml並保存
kubectl apply -f nginx.yaml

第二種:
先查看要修改的資源對象

#kubectl get pod,svc,deploy -n k8s-nginx
NAME                                READY   STATUS    RESTARTS   AGE
pod/nginx-deploy-5d677c4495-5wmf2   1/1     Running   0          26m
pod/nginx-deploy-5d677c4495-lzv6g   1/1     Running   0          37m
pod/nginx-deploy-5d677c4495-rpfgg   1/1     Running   0          37m

NAME                TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
service/k8s-nginx   NodePort   169.169.249.80   <none>        80:10280/TCP   42m

NAME                                 DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.extensions/nginx-deploy   3         3         3            3           39m
 

然後再執行以下命令

kubectl edit deployment.extensions/nginx-deploy -n k8s-nginx
直接編輯,完成後保存,保存後要查看是否出錯,如果沒有出錯會立即生效,如果有出錯,下面會出現error字樣,並在/tmp下生成一個臨時文件,此時原文件並沒有修改,不會影響線上業務

k8s yaml文件說明