Deployment status and history in Kubernetes - Mini Project: Build & Apply

Deployment status and history

📖 Scenario: You are managing a Kubernetes cluster where you deploy applications using Deployments. You want to check the current status of your deployment and review its update history to ensure everything is running smoothly.

🎯 Goal: Learn how to check the status of a Kubernetes Deployment and view its rollout history using kubectl commands.

📋 What You'll Learn

Use kubectl commands to check deployment status

Use kubectl rollout history to view deployment history

Understand how to interpret deployment status output

💡 Why This Matters

🌍 Real World

Kubernetes Deployments are used to manage application updates safely and reliably in production environments.

💼 Career

Knowing how to check deployment status and history is essential for DevOps engineers and site reliability engineers to maintain application uptime and troubleshoot issues.

1

Create a Deployment YAML file

Create a file named nginx-deployment.yaml with a Deployment manifest for an nginx application with 2 replicas and image nginx:1.21.

Kubernetes

# Create the nginx Deployment YAML file with 2 replicas and image nginx:1.21
# Your code here

Need a hint?

Use the Deployment kind and specify replicas and container image exactly as shown.

2

Apply the Deployment to the cluster

Use the command kubectl apply -f nginx-deployment.yaml to create the Deployment in your Kubernetes cluster.

Kubernetes

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80

# Run the command to apply the deployment
# Your code here

Need a hint?

Use kubectl apply -f nginx-deployment.yaml to create the deployment.

3

Check the Deployment status

Use the command kubectl rollout status deployment/nginx-deployment to check the rollout status of the Deployment.

Kubernetes

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80

# Command to apply deployment
kubectl apply -f nginx-deployment.yaml

# Check rollout status below
# Your code here

Need a hint?

Use kubectl rollout status deployment/nginx-deployment to see if the deployment is complete.

4

View the Deployment rollout history

Use the command kubectl rollout history deployment/nginx-deployment to view the rollout history of the Deployment.

Kubernetes

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80

# Command to apply deployment
kubectl apply -f nginx-deployment.yaml

# Check rollout status
kubectl rollout status deployment/nginx-deployment

# View rollout history below
# Your code here

Need a hint?

Use kubectl rollout history deployment/nginx-deployment to see past revisions.