Topics and subscriptions in GCP - Mini Project: Build & Apply

Create and Configure Pub/Sub Topics and Subscriptions in GCP

📖 Scenario: You are setting up a messaging system in Google Cloud Platform (GCP) using Pub/Sub. This system will allow different parts of your application to communicate by sending and receiving messages asynchronously.First, you will create a topic where messages can be published. Then, you will create a subscription to that topic so that messages can be received and processed.

🎯 Goal: Build a Pub/Sub topic named news-updates and a subscription named news-subscriber that listens to this topic.

📋 What You'll Learn

Create a Pub/Sub topic called news-updates.

Create a subscription called news-subscriber for the news-updates topic.

Set the subscription's acknowledgment deadline to 20 seconds.

Use the Google Cloud SDK gcloud commands in the correct order.

💡 Why This Matters

🌍 Real World

Messaging systems in cloud applications often use Pub/Sub to decouple components and handle asynchronous communication.

💼 Career

Cloud engineers and developers use Pub/Sub topics and subscriptions to build scalable, event-driven architectures.

1

Create the Pub/Sub topic

Use the gcloud pubsub topics create command to create a topic named news-updates.

GCP

# Your command here to create the topic news-updates

Need a hint?

Remember the command format: gcloud pubsub topics create [TOPIC_NAME].

2

Create the subscription variable

Create a variable called SUBSCRIPTION_NAME and set it to news-subscriber.

GCP

gcloud pubsub topics create news-updates
# Define SUBSCRIPTION_NAME variable here

Need a hint?

Use the syntax VARIABLE_NAME=value to create a variable in shell.

3

Create the subscription with acknowledgment deadline

Use the gcloud pubsub subscriptions create command to create a subscription named news-subscriber for the topic news-updates. Set the acknowledgment deadline to 20 seconds using the --ack-deadline flag.

GCP

gcloud pubsub topics create news-updates
SUBSCRIPTION_NAME=news-subscriber
# Create subscription with ack deadline 20 seconds

Need a hint?

Use --ack-deadline=20 to set the acknowledgment deadline to 20 seconds.

4

Verify the subscription configuration

Use the gcloud pubsub subscriptions describe command with the subscription name news-subscriber to verify the subscription exists and has the correct acknowledgment deadline.

GCP

gcloud pubsub topics create news-updates
SUBSCRIPTION_NAME=news-subscriber
gcloud pubsub subscriptions create $SUBSCRIPTION_NAME --topic=news-updates --ack-deadline=20
# Describe the subscription to verify

Need a hint?

This command shows the subscription details including the acknowledgment deadline.