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Useful CKA Kubectl Commands

What this page is

This page contains only commands that would be useful to known whilst doing the CKA because:

  • Some are shortcuts to generating files
  • Some speed up finding resources
  • They are Quality of Life things

Create a pod

kubectl run nginx --image nginx

Create Pod manifest file

The below commands creates the manifest file, but instead of applying it, prints it to stdout 

kubectl run nginx --image nginx --dry-run=client -o yaml

Example

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
spec:
  containers:
  - image: nginx
    name: nginx
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Always
status: {}

Create Deployment

kubectl create deployment --image nginx nginx --dry-run=client -o yaml

Example

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: nginx
  name: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx
    spec:
      containers:
      - image: nginx
        name: nginx
        resources: {}
status: {}

Get all resources in a namespace

kubectl get all

get all resources in a namespace using a selector

kubectl get all --selector env=prod
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