Why service mesh matters in Kubernetes - See It in Action

Why Service Mesh Matters

📖 Scenario: You are working in a company that runs many small applications inside a Kubernetes cluster. These applications need to talk to each other securely and reliably. You want to understand how a service mesh can help manage this communication.

🎯 Goal: Learn the basics of why a service mesh is important by creating a simple Kubernetes setup with two services and adding a service mesh configuration to manage their communication.

📋 What You'll Learn

Create two Kubernetes services with pods

Add a label to identify services for the mesh

Configure a simple service mesh policy for communication

Display the status of the service mesh setup

💡 Why This Matters

🌍 Real World

Service meshes help manage communication between many small services in Kubernetes, improving security, reliability, and observability.

💼 Career

Understanding service mesh basics is important for Kubernetes administrators and DevOps engineers to build scalable and secure cloud-native applications.

1

Create two Kubernetes services

Create two Kubernetes services called service-a and service-b each with a pod running the nginx image. Use labels app: service-a and app: service-b respectively.

Kubernetes

# Create two Kubernetes services with pods
# Your code here

Need a hint?

Use Kubernetes Pod and Service YAML definitions with correct labels and selectors.

2

Add labels for service mesh

Add the label mesh: enabled to both pods pod-a and pod-b to mark them for service mesh management.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: pod-a
  labels:
    app: service-a
    # Add mesh label here
spec:
  containers:
  - name: nginx
    image: nginx
# Your code here

Need a hint?

Add the label under metadata.labels for each pod.

3

Configure simple service mesh policy

Create a Kubernetes ConfigMap named mesh-policy with data key allow-communication set to service-a to service-b to simulate a mesh policy allowing communication from service-a to service-b.

Kubernetes

apiVersion: v1
kind: ConfigMap
metadata:
  name: mesh-policy
  # Add data key and value below
# Your code here

Need a hint?

Use data field in ConfigMap to add the key and value.

4

Display service mesh status

Write a command to display the ConfigMap mesh-policy data to show the service mesh policy status.

Kubernetes

# Write the kubectl command to show the mesh-policy ConfigMap data
# Your code here

Need a hint?

Use kubectl get configmap mesh-policy -o yaml to see the data.