apply

Using apply Command

apply with YAML files

Apply can be run directly against Resource Config files or directories using -f

# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: the-deployment
spec:
  replicas: 5
  template:
    containers:
      - name: the-container
        image: registry/conatiner:latest

# Apply the Resource Config
kubectl apply -f deployment.yaml

This will apply the deployment file on the Kubernetes cluster. You can get the status by using a get command.

# Get deployments
kubectl get deployments

apply with Kustomize files

Though Apply can be run directly against Resource Config files or directories using -f, it is recommended to run Apply against a kustomization.yaml using -k. The kustomization.yaml allows users to define configuration that cuts across many Resources (e.g. namespace).

# kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
# list of Resource Config to be Applied
resources:
- deployment.yaml
# namespace to deploy all Resources to
namespace: default
# labels added to all Resources
commonLabels:
  app: example
  env: test

# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: the-deployment
spec:
  replicas: 5
  template:
    containers:
      - name: the-container
        image: registry/conatiner:latest

Users run Apply on directories containing kustomization.yaml files using -k or on raw ResourceConfig files using -f.

# Apply the Resource Config
kubectl apply -k .
# View the Resources
kubectl get -k .