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Workloads

  • Cron Jobs
  • Daemon Sets
  • Deployments
  • Stateful Sets
  • Replication Controllers
  • Replica Sets

Deployments via Terminal​

Example using the nginx image from: https://hub.docker.com/_/nginx

Create a deployment​

kubectl create deployment nginx-deployment --image=nginx --replicas=3 --port=80
deployment.apps/nginx-deployment created

Creates a deployment named nginx-deployment using the nginx image. You can specify a port for documentation purposes, similar to EXPOSE in Dockerfiles.

kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-664fcb7fb8-288gv   1/1     Running   0          2m31s
nginx-deployment-664fcb7fb8-5dkrs   1/1     Running   0          2m31s
nginx-deployment-664fcb7fb8-6pwjc   1/1     Running   0          2m31s

Edit a deployment​

View or modify the Deployment configuration:

kubectl edit deployment nginx-deployment
deployment.apps/nginx-deployment edited

Scale a deployment​

kubectl scale deployment nginx-deployment --replicas=9

Delete a deployment​

Deletes the specified resource and all objects created with it.

kubectl delete deployment nginx-deployment
deployment.apps "nginx-deployment" deleted

Deployments via YAML​

Example using the httpd image from: https://hub.docker.com/_/httpd

Apply a YAML file:​

Create a YAML file, for example, with vi:

vi httpd-deylopment.yaml

Example manifest:

apiVersion: apps/v1           # Kubernetes API version
kind: Deployment              # Type of resource
metadata:                     # Object metadata (name, labels, etc.)
  name: httpd-deployment       
  labels:                      
    app: httpd
spec:                         # Desired state of the resource
  replicas: 3                 # Count of pods to run
  selector:
    matchLabels:
      app: httpd              
  template:                   # Pod template
    metadata:
      labels:
        app: httpd            
    spec:
      containers:
      - name: httpd           # Container name
        image: httpd:latest   # Container image
        ports:
        - containerPort: 80   # Expose port 80 from the container to the host
kubectl apply -f httpd-deployment.yml
deployment.apps/httpd-deployment created