TCP probe configuration in Kubernetes - Mini Project: Build & Apply

TCP Probe Configuration in Kubernetes

📖 Scenario: You are managing a Kubernetes deployment for a simple web application. To ensure your application is healthy and ready to serve traffic, you need to configure a TCP readiness probe. This probe will check if the application is accepting TCP connections on a specific port.

🎯 Goal: Configure a Kubernetes pod manifest with a TCP readiness probe on port 80. This probe will help Kubernetes know when the pod is ready to receive traffic.

📋 What You'll Learn

Create a pod manifest named tcp-probe-pod.yaml with a container named webapp.

Set the container image to nginx:latest.

Add a readiness probe using TCP socket on port 80.

Set initialDelaySeconds to 5 and periodSeconds to 10 for the readiness probe.

💡 Why This Matters

🌍 Real World

TCP probes are used in Kubernetes to check if an application is ready to accept network connections, which is important for load balancing and service availability.

💼 Career

Understanding how to configure readiness and liveness probes is essential for DevOps engineers and site reliability engineers to maintain healthy Kubernetes applications.

1

Create the basic pod manifest

Create a YAML file named tcp-probe-pod.yaml with a pod named tcp-probe-pod that has one container named webapp using the image nginx:latest. Include the apiVersion, kind, and metadata fields.

Kubernetes

# Your code here

Need a hint?

Start with the basic pod structure and specify the container details.

2

Add the readiness probe configuration

Add a readinessProbe section under the container webapp. Configure it to use a TCP socket on port 80.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: tcp-probe-pod
spec:
  containers:
  - name: webapp
    image: nginx:latest
    # Add readinessProbe with tcpSocket on port 80

Need a hint?

Use tcpSocket under readinessProbe and specify the port number.

3

Add timing settings to the readiness probe

Add initialDelaySeconds set to 5 and periodSeconds set to 10 inside the readinessProbe configuration under the container webapp.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: tcp-probe-pod
spec:
  containers:
  - name: webapp
    image: nginx:latest
    readinessProbe:
      tcpSocket:
        port: 80
      # Add initialDelaySeconds: 5 and periodSeconds: 10 here

Need a hint?

Place these timing settings at the same level as tcpSocket inside readinessProbe.

4

Display the final pod manifest

Print the complete content of the tcp-probe-pod.yaml file to verify the readiness probe configuration.

Kubernetes

# Print the pod manifest content
# Your code here

Need a hint?

Use multiple print statements to output each line of the YAML manifest exactly as shown.