Dynamic configuration updates in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is dynamic configuration update in microservices?

It is the ability to change service settings or parameters at runtime without restarting the service, allowing quick adaptation to new conditions.

beginner

Name a common tool used for managing dynamic configuration in microservices.

Tools like Consul, etcd, or Spring Cloud Config Server are commonly used to store and distribute configuration dynamically.

intermediate

Why is it important to avoid service restarts when updating configuration?

Avoiding restarts prevents downtime and service disruption, ensuring continuous availability and better user experience.

intermediate

What is a common pattern to notify microservices about configuration changes?

Using a publish-subscribe pattern where configuration changes are published and services subscribe to receive updates in real-time.

advanced

How can microservices ensure consistency when configuration updates happen concurrently?

By using versioning, atomic updates, and distributed locks to coordinate changes and avoid conflicts.

Which of the following best describes dynamic configuration updates?

A Changing service settings without restarting the service

B Restarting services to apply new settings

C Hardcoding configuration in the service code

D Ignoring configuration changes during runtime

Dynamic configuration updates allow changing settings without restarting, enabling seamless updates.

Which tool is NOT typically used for dynamic configuration management?

A Consul

B etcd

C GitHub Actions

D Spring Cloud Config

GitHub Actions is for CI/CD workflows, not configuration management.

What pattern helps microservices get notified about config changes?

A Polling only

B Publish-subscribe

C Batch processing

D Request-response

Publish-subscribe allows real-time notifications of config changes.

Why is versioning important in dynamic configuration updates?

A To track and manage different config states safely

B To slow down updates

C To delete old configurations immediately

D To avoid using configuration files

Versioning helps track changes and avoid conflicts during updates.

What is a risk if configuration updates require service restarts?

A Automatic scaling

B Faster updates

C Improved performance

D Service downtime and user disruption

Restarting services causes downtime, affecting availability.

Explain how dynamic configuration updates improve microservice availability and flexibility.

Think about how services stay running while configs change.

Describe common methods and tools used to implement dynamic configuration updates in microservices.

Consider how services get and apply new settings safely.