Scaling your containers

Scaling up and down the application or service based on predefined criteria is a common way to utilize the most compute resources in most efficient way. In Kubernetes, you can scale up and down manually or use a Horizontal Pod Autoscaler (HPA) to do autoscaling. In this section, we'll describe how to perform both operations.

Getting ready

Prepare the following YAML file, which is a simple Deployment that launches two nginx containers. Also, a NodePort service with TCP—30080 exposed:

# cat 3-1-1_deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      service : nginx
  template:
    metadata:
      labels:
        service : nginx
    spec:
      containers:
        - name: my-container
          image: nginx
---
apiVersion: v1
kind: Service
metadata:
  name: my-nginx
spec:
  ports:
    - protocol: TCP
      port: 80
      nodePort: 30080
  type: NodePort
  selector:
    service: nginx

Note

NodePort...