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Deployments

While ReplicaSets are useful, they lack advanced features like rolling updates and rollbacks. Deployments build on top of ReplicaSets to provide declarative updates for Pods and ReplicaSets.

What Is a Deployment?

A Deployment manages a ReplicaSet and provides capabilities like rolling updates, rollbacks, and declarative scaling. It is the most common workload controller for stateless applications.

A Deployment provides declarative updates for Pods and ReplicaSets.

Deployment YAML Example

Here’s a Deployment for Nginx with 3 replicas:
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80

Creating and Inspecting a Deployment

Apply the YAML:
kubectl apply -f nginx-deployment.yaml
View the Deployment:
kubectl get deployments
See the underlying ReplicaSet:
kubectl get replicasets
Check Pods:
kubectl get pods

Scaling a Deployment

Scale to 5 replicas:
kubectl scale deployment nginx-deployment --replicas=5

Deleting a Deployment

Deleting the Deployment deletes the associated ReplicaSet and Pods:
kubectl delete deployment nginx-deployment


Two Minute Drill
  • Deployment manages ReplicaSets and provides rolling updates and rollbacks.
  • Define replicas, selector, and pod template.
  • Use kubectl scale to change replicas.
  • Deleting a deployment removes its ReplicaSet and Pods.

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