kubectl run not creating deployment-CodePudding

I'm running Kubernetes with docker desktop on windows. DD is up-to-date, and the kubectl version command returns 1.22 as both the client and server version.

I executed kubectl run my-apache --image httpd, then kubectl get all, which only shows

There is no deployment or replicaset as I expect. This means some commands, such as kubectl scale doesn't work. Any idea what's wrong? Thanks.

CodePudding user response：

The kubectl run command create pod not deployment, I mean it used to create in the past before kubernetes version 1.18 I guess.

For deployment you have run this command

kubectl create deployment my-apache --image httpd

CodePudding user response：

You basically spin up a pod in the default namespace, if you want to deploy your app using deployment you should have a deployment.yml file and use :

kubectl apply -f <depoyment_file>

Example to spin-up 3 Nginx pods:

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:1.14.2
        ports:
        - containerPort: 80

Side note: There are 2 approaches when creating basic k8s objects:

IMPERATIVE way:

kubectl create deployment <DEPLOYMENT_NAME> --image=<IMAGE_NAME:TAG>

DECLARATIVE way:

kubectl create -f deployment.yaml