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Kubernetes in Practice

Scaling Up/Down Our Application

Explore scaling Kubernetes applications by adjusting replica counts in deployment manifests. Learn to increase or decrease pods smoothly while understanding container scheduling in multi-node clusters to maintain application availability.

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Scaling Up Our Application

Another cool thing that deployments can do is scale up and down the number of replicas we have running. Right now, we are running a single container for our application. Changing that is just a matter of updating our manifest file with our new desired number of replica and sending that to Kubernetes:

YAML
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hellok8s
spec:
  replicas: 10
  selector:
    matchLabels:
      app: hellok8s
  template:
    metadata:
      labels:
        app: hellok8s
    spec:
      containers:
      - image: brianstorti/hellok8s:v1
        name: hellok8s-container

The manifest is exactly the same except for the replicas field that ...