Microservices using ASP.NET Core Online Training

Welcome to our in-depth Microservices using ASP.NET Core Online Training Program. This program offers in-depth knowledge of Microservices using ASP.NET Core. It will cover the basics, intermediate, and advanced concepts, including new concepts, which will help you handle real-world application development challenges.

New Batch: 8th July, 2025

📅 New Batch: 8th July 2025, 6:30 AM to 8:00 AM IST
🔗 Registration Link: https://forms.gle/7yiT3tZHrhMbWDTE9
📱 Telegram Group: https://telegram.me/microservicesusingaspnetcore
📞 Mobile / WhatsApp Number: +91 70218 01173

⏳ Duration: 3 Months
💰 Course Fees: ₹10,000 INR or $125 USD

What are Microservices?

Microservices represent a modern approach to software architecture that emphasizes breaking down an application into smaller, independent services. Each service focuses on a specific business function and operates separately. Unlike traditional monolithic applications, which tightly integrate all functionalities into a single large codebase, microservices are modular and loosely coupled, allowing them to be developed, deployed, and scaled independently.

Why Use Microservices with ASP.NET Core?

ASP.NET Core is a robust, high-performance framework ideal for building microservices. Here’s why:

High Performance: ASP.NET Core is renowned for its speed and performance, making it an ideal choice for building scalable microservices.
Cross-Platform Support: ASP.NET Core is cross-platform, which allows us to develop and deploy microservices on Windows, Linux, or macOS.
Containerization Support: Easily integrate with other technologies and frameworks, including Docker and Kubernetes.
Security: Built-in features for authentication and authorization ensure your microservices are secure.
Modular and Lightweight: ASP.NET Core’s modular architecture ensures that you only include the necessary components, keeping your services lightweight.

Note: Since this Microservices using ASP.NET Core Training Program is online, you may miss some classes due to office work, internet issues, electricity problems, medical issues, different time zones, or personal reasons. So, we will provide everyone with the Daily Recorded Sessions and Class Notes at the end of the class.

Microservices using ASP.NET Core Web API

Module 1: Foundations & Fundamentals

The objective of this module is to lay the foundation for understanding the core concepts of microservices, with a focus on how microservices differ from traditional monolithic systems. Students will learn the fundamental principles, architecture, and design considerations essential for building scalable and maintainable microservices using ASP.NET Core Web API. By the end of this module, students will have a solid understanding of microservices architecture and its role in modern software development projects.

Chapter 1: Introduction to Microservices Architecture

This chapter aims to introduce students to the fundamental concepts of microservices and their differences from monolithic systems. Students will learn about the characteristics, advantages, and challenges of microservices, along with real-world examples from companies such as Netflix, Amazon, and Uber. By the end, they will understand when and why to transition from a monolithic to a microservices architecture, as well as how to identify the right use cases for microservices.

Topics to be Covered:

What applications and how they are structured into different layers.
Types of applications (web, mobile, desktop) and their real-world examples.
Monolithic architecture, its layered structure, benefits, and challenges are illustrated with an e-commerce example.
Microservices architecture, its working principles, advantages, and challenges are explained in practical e-commerce scenarios.
Real-world case studies from companies like Netflix, Amazon, and Uber show why organizations transition from monolithic systems to microservices.

Chapter 2: Core Microservices Design Principles

Students will understand the principles that make Microservices successful, such as loose coupling, SRP, Independent Deployment, and Decentralized Data Management.

Topics to be Covered:

Single Responsibility Principle (SRP)
Independent Deployment
Decentralized Data Management
Loose Coupling and High Cohesion
Event-Driven Communication
Fault Isolation and Scalability
Technology Diversity

Chapter 3: ASP.NET Core Web API Fundamentals

This chapter aims to provide a solid foundation for developing ASP.NET Core Web APIs. Students will learn how to set up a development environment, understand core concepts such as Models, DTOs, DbContext, and Controllers, and work with CRUD operations using Entity Framework Core. This chapter also covers API testing using tools such as Postman and Swagger to ensure that APIs are functional.

Topics to be Covered:

Difference Between .NET Core and .NET Framework
What is ASP.NET Core Web API?
Creating a New ASP.NET Core Web API Project
Understanding Models, DTOs, DbContext, Controllers
Testing APIs using Postman, Swagger, and Fiddler.

Chapter 4: Clean Architecture

This chapter will introduce students to Clean Architecture principles, emphasizing the separation of concerns and maintainability. Students will learn how to structure microservices using layers (Presentation, Application, Domain, and Infrastructure) and understand the benefits of Clean Architecture in creating scalable and maintainable systems.

Topics to be Covered:

What Is Clean Architecture?
Why is Clean Architecture Important?
Understanding the Layers of Clean Architecture
Real-time Example: Product Management System using Clean Architecture in ASP.NET Core Web API
Benefits of Clean Architecture in ASP.NET Core Web API

Chapter 5: Domain-Driven Design (DDD)

The student will learn about Domain-Driven Design (DDD), a software development approach that emphasizes the importance of the business domain in application design. It focuses on creating a shared understanding of the domain between developers and domain experts, encapsulating complex business rules in rich domain models, and organizing code around domain concepts.

Topics to be Covered:

What Is Domain-Driven Design (DDD)?
Why is Domain-Driven Design Important?
Understanding the Layers of Domain-Driven Design
Real-time Example using Domain-Driven Design in ASP.NET Core Web API
Benefits of Domain-Driven Design in ASP.NET Core Web API

Module 2: Building Core Microservices (Hands-on Development)

In this module, students will transition from theoretical concepts to practical development. They will learn to design and build the core microservices (Product, Order, Payment, User, and Notifications) that will form the backbone of a modern e-commerce platform. This module emphasizes hands-on experience with building scalable, maintainable, and secure microservices using ASP.NET Core Web API, Entity Framework Core, and SQL Server database. By the end, students will have a comprehensive set of services that can work independently and integrate.

Chapter 6: Building the Product Microservice

This chapter teaches students how to develop a Product Microservice using ASP.NET Core Web API. They will learn about the Product domain, how to manage relationships such as Product Category, and the importance of data validation using FluentValidation and Data Annotations. Students will also get hands-on experience implementing CRUD operations using EF Core.

Topics to be Covered:

Product Management: CRUD operations for products (add, update, delete, view).
Category & Subcategory Management: Organize products into categories for easier browsing.
Inventory Management: Track product stock levels, availability status, and automatic stock updates.
Product Images: Upload, store, and serve product images.
Search & Filtering: Enable search by product name, category, price, rating, and other filters.
Price & Discount Management: Manage product pricing, discounts, and promotional offers.
Product Reviews & Ratings: Manage customer reviews and star ratings.
API Endpoints: Public APIs to expose product data for other microservices or frontend consumption.

Chapter 7: Creating the User Microservice

This chapter focuses on managing user authentication, registration, and profiles using JWT security. Students will learn about JWT tokens, role-based authorization, and secure profile management. By the end of the chapter, students will implement the User Service with authentication, login, and profile management capabilities.

Topics to be Covered:

User Registration & Authentication: Support user signup, login, password reset, and multi-factor authentication (MFA).
User Profile Management: CRUD operations for user profiles, including name, email, address, and phone number.
Role & Permission Management: Support roles such as Admin, Customer, and Vendor with role-based authorization.
Address Book: Manage multiple shipping and billing addresses per user.
Session Management & Security: JWT or OAuth2 token-based authentication, refresh tokens, secure password hashing.
User Activity Tracking: Track user logins, last seen, and other security events.
Account Verification: Email verification and phone number verification via OTP.
Social Login Integration: Support for Google, Facebook, or other OAuth providers.
API for User Data: Secure APIs for other microservices (e.g., Order Microservice) to retrieve user details when needed.

Chapter 8: Building the Order Microservice

Students will learn to develop the Order Microservice, focusing on managing customer orders, items, and order statuses. The chapter will cover repository patterns, Entity Framework Core for data persistence, and how to handle relationships between entities. Students will implement key features like order placement, tracking, and cancellation.

Topics to be Covered:

Order Placement: Create new orders and validate cart items, quantities, and user details.
Order Tracking: Maintain order status lifecycle (Placed, Confirmed, Packed, Shipped, Delivered, Cancelled, Returned).
Order History: Allow users to view their past orders.
Order Validation: Verify product availability and prices before confirming the order.
Cart Management: Maintain users’ current shopping cart and support CRUD for cart items.
Order Cancellation & Returns: Support order cancellation before shipment and returns management.
Integration with Payment Microservice: Update order payment status and trigger workflows accordingly.
Integration with Notification Microservice: Send order confirmations, shipment notifications, and delivery notifications.
Invoice Generation: Generate and store order invoices.
API for Orders: APIs for placing, updating, and retrieving orders and for internal communication with other microservices.

Chapter 9: Creating the Payment Microservice

In this chapter, students will build a Payment Microservice, simulating payment gateways such as cash, card, and UPI. They will learn about payment flows, handle payment status updates, and integrate the Payment service with the Order service. The chapter will also cover how to secure payment endpoints using API keys and authentication.

Topics to be Covered:

Payment Gateway Integration: Support multiple payment methods (Credit/Debit Cards, Net Banking, UPI, Wallets).
Payment Processing: Handle payment authorization, capture, refund, and failure.
Transaction Management: Store payment transaction details with statuses.
Secure Payment Data: Ensure PCI compliance and encryption of sensitive data.
Refund Processing: Handle partial and full refunds.
Payment Status Updates: Notify the Order Microservice of payment success or failure.
Retry Mechanism: Retry failed payment attempts or offer alternative payment methods.
API Endpoints: APIs for initiating payments, checking status, refunds, and reports.

Chapter 10: Creating the Notification Microservice

In this chapter, students will learn how to build a Notification Microservice that listens for events (such as order placement) and sends notifications via email or SMS. This chapter covers integrating RabbitMQ for asynchronous message consumption and sending templated notifications in response to business events, such as ‘Order Placed’ and ‘Payment Success’.

Topics to be Covered:

Multi-Channel Notification: Support notifications via Email, SMS, Push notifications, and possibly in-app notifications.
Template Management: Manage reusable templates for order confirmations, shipment updates, payment receipts, and promotional messages.
Event-Driven Architecture: Listen for events from other microservices (e.g., ‘Order placed’, ‘Payment success’, ‘Shipment dispatched’).
Notification Scheduling: Schedule notifications for future delivery (e.g., reminders, promotions).
Retry & Failure Handling: Retry failed notification attempts and log failures.
User Preferences: Allow users to opt in or out of notification types and channels.
API Endpoints: APIs to send notifications, manage templates, and get notification history.

Module 3: Inter-Service Communication

This module focuses on how microservices interact and collaborate in a distributed system. Students will explore both synchronous and asynchronous communication patterns, effective strategies for managing distributed data, API gateway setup, service discovery, essential security techniques, and performance optimization through caching. By the end of this module, students will be able to design and implement robust, scalable, and secure communication mechanisms among microservices using ASP.NET Core Web API.

Chapter 11: Inter-Service Communication in Microservices

This chapter introduces students to the concepts of inter-service communication in a microservices architecture. Students will learn about synchronous (HTTP/REST) and asynchronous (RabbitMQ) communication.

Topics to be Covered:

Need for inter-service communication in microservices
Synchronous communication: HTTP REST APIs, gRPC overview, pros and cons
Asynchronous communication: Messaging basics (RabbitMQ, Kafka) and event-driven architecture
Designing APIs for internal vs. external consumption
Basic error handling and HTTP status codes
Timeouts and cancellation handling in service calls
Best practices for service-to-service communication in ASP.NET Core Web API

Hands-on Lab:

Implement RESTful HTTP communication between the Product and Order microservices.
Integrate RabbitMQ for asynchronous messaging between the Order and Notification microservices.
Test synchronous and asynchronous communication flows end-to-end with Postman and logs.

Chapter 12: Data Management Strategies in Microservices

This chapter teaches students how to manage distributed data in microservices. They will understand the concepts of distributed transactions. Students will learn how to implement the Saga Pattern to manage distributed workflows across multiple services and maintain data consistency in microservices.

Topics to be Covered:

Challenges of data management in microservices (distributed transactions, consistency)
Why shared databases are an anti-pattern in microservices
Database per microservice approach: schema isolation and independent scaling
Data consistency challenges: eventual vs. strong consistency
Patterns for data consistency overview:
1. Saga Pattern (concept, choreography vs orchestration)
2. Two-Phase Commit (2PC) overview and limitations
3. Event Sourcing fundamentals
4. Command Query Responsibility Segregation (CQRS) overview
Handling distributed transactions and compensating actions
Query patterns: API Composition and CQRS
Real-time example: Handling distributed order and payment data

Hands-on Lab:

Implement the Saga pattern (conceptual) using messaging to coordinate distributed transactions.
Develop compensating actions for rollback scenarios
Create sample API Composition endpoints aggregating data from User, Order, and Product microservices

Chapter 13: API Gateway and Service Discovery

By the end of this chapter, students will understand the critical role of an API Gateway in a microservices architecture. They will be able to configure and implement an API Gateway using Ocelot. They will learn how to manage request routing through path-based and header-based strategies, implement centralized authentication with JWT at the gateway level, and perform request aggregation for efficient communication between clients and multiple microservices.

Topics to be Covered:

What is an API Gateway? Why is it essential in microservices architecture?
Standard features include Routing, aggregation, authentication, rate limiting, and load balancing.
Popular API Gateway implementations (Ocelot, YARP, Kong) in the ASP.NET Core ecosystem
Setting up Ocelot API Gateway in ASP.NET Core.
Service Discovery concepts: Client-side vs. Server-side discovery patterns.
Service Registry & Discovery (Eureka, Consul, custom solutions): How microservices find each other.
Edge vs. internal API Gateway scenarios.
Example: Exposing Product, Order, and User APIs through a single gateway.
Securing microservices via the gateway.

Hands-on/Lab:

Set up and configure Ocelot API Gateway to route requests to Product and Order microservices based on paths and headers.
Implement JWT-based centralized authentication at the API Gateway level.
Register microservices with a service registry, such as Consul or Eureka, and configure service discovery in the API Gateway.
Create simple request aggregation APIs at the gateway that combine data from multiple services.
Test gateway routing, authentication, and aggregation flow using Postman.

Chapter 14: Rate Limiting / Throttling

Protecting microservices from overload and abuse by implementing API rate limiting and throttling strategies.

Topics to be Covered:

Why rate limiting and throttling are important in microservices
Typical scenarios: load spikes, denial of service (DoS) prevention, fair usage policies
Types of rate limiting: fixed window, sliding window, token bucket, and leaky bucket algorithms
Rate limiting at different layers: API Gateway, microservice middleware, client-side
Implementing rate limiting with Ocelot API Gateway in ASP.NET Core
Using middleware for throttling inside microservices
Configuring limits by IP, user, API key, or route
Handling rate limit exceeded responses (HTTP 429) and client notifications
Monitoring and logging rate limit events
Best practices to balance protection and user experience

Hands-on Lab:

Configure Ocelot to enforce rate-limiting policies for APIs
Implement middleware-based throttling in ASP.NET Core microservices
Test rate limiting under simulated load scenarios using Postman or load testing tools

Chapter 15: Security in Microservices

This chapter introduces the concepts of securing microservices using JWT tokens, role-based authorization, and securing endpoints with policies in ASP.NET Core. Students will learn how to apply security standards to protect services and implement role-based access control (RBAC) for different user roles (e.g., Admin, Customer).

Topics to be Covered:

Security challenges in microservices architecture
Authentication vs Authorization
Authentication strategies:
1. JWT token-based authentication (with IdentityServer4 or ASP.NET Core Identity)
2. OAuth2 and OpenID Connect basics
Authorization approaches: Role-based (RBAC), Policy-based, Claims-based.
Secure inter-service communication: API keys, mutual TLS, and token propagation.
Protecting APIs behind the API Gateway.
Handling secrets: Configuration management, Key Vaults, environment variables.
Best practices Include Rate limiting, IP filtering, logging, and auditing.

Hands-on/Lab:

Implement JWT authentication for the User microservice and secure other microservices with token validation.
Propagate JWT tokens through the API Gateway to backend services.
Set up role-based authorization (RBAC) for Admin, Customer, and Vendor roles.
Secure inter-service communication using API keys or mutual TLS.
Use HTTPS for all inter-service calls.
Test authentication and authorization flow with Postman, including negative test cases.

Chapter 16: Performance Optimization with Caching

Students will learn the importance of caching in microservices to optimize performance and reduce redundant requests. This chapter covers Redis as a distributed caching solution, explaining how to implement caching, manage TTL (time-to-live), and invalidate the cache when necessary. Students will implement Redis caching in their Product service to store and retrieve frequently accessed data.

Topics to be Covered:

Why is caching essential in microservices?
Caching strategies: Client-side, server-side, and distributed caching.
Cache invalidation patterns and challenges.
Setting up a distributed cache with Redis in ASP.NET Core.
Caching at API Gateway vs. microservice level.
Cache aside, read-through, and write-through strategies.
Avoiding common pitfalls: Stale data, cache stampede, and consistency.
Real-world examples: Caching product catalog, user sessions, and token validation.

Hands-on/Lab:

Integrate Redis, a distributed cache, with the Product microservice to store frequently accessed data, such as product listings.
Implement response caching at the API Gateway (Ocelot) for GET endpoints to reduce load on microservices.
Design and implement cache expiration policies and TTL (time-to-live).
Handle cache invalidation scenarios to prevent stale data.
Measure and compare API response times with and without caching.

Module 4: Advanced Communication, Messaging & Integration

This module explores advanced communication strategies and integration patterns that enable scalable, resilient, and responsive microservices systems. Students will learn to implement high-performance RPC communication, design and build event-driven systems, leverage enterprise-grade messaging with MassTransit, and apply CQRS and Event Sourcing for advanced data management and processing. By the end of this module, students will be equipped to build enterprise-level distributed systems with cutting-edge .NET technologies.

Chapter 17: High-Performance Service Communication with gRPC

This chapter teaches students how to use gRPC for high-performance communication between services. Students will learn about gRPC message structures, serialization with Protobuf, and the differences between gRPC and REST. By the end, students will implement real-time communication between microservices using gRPC.

Topics to be Covered:

Introduction to Remote Procedure Call (RPC) and Why gRPC for Microservices
Overview of gRPC and Protocol Buffers
Defining Service Contracts Using .proto Files
Advantages of gRPC: Performance, contract-first design, streaming capabilities, and use cases
Setting Up and Implementing gRPC Services in ASP.NET Core
Types of gRPC Calls: Unary, client streaming, server streaming, and bidirectional streaming (including synchronous and asynchronous streaming)
Interoperability with Other Languages/Platforms
Versioning and Backward Compatibility in gRPC Contracts
Securing gRPC Communication: TLS and authentication
gRPC vs. REST: Performance, payload size, streaming, and when to use each

Hands-on/Lab:

Create a simple gRPC service and client in ASP.NET Core for microservice communication.
Implement unary and streaming RPC calls (client streaming, server streaming, bidirectional streaming) between Order and Inventory microservices.
Compare the performance of gRPC calls against REST APIs for common microservice interactions.
Secure gRPC services using TLS and implement authentication.

Chapter 18: Building Event-Driven Microservices Architecture

Students will explore event-driven architecture and learn how to implement the Event Bus pattern and Event Sourcing. They will understand the benefits of decoupling services and how to use events to communicate between services. Students will implement an event-driven flow for the ProductAdded event to update other services in real time.

Topics to be Covered:

Principles of Event-Driven Architecture (EDA)
Benefits of EDA: Scalability, responsiveness, resilience
Core Concepts: Events, producers, consumers, topics, and queues
Event Brokers and Messaging Platforms Overview: RabbitMQ, Apache Kafka
Designing Events and Event Schemas
Handling Event Versioning and Schema Evolution
Event Processing Patterns: Competing consumers, publish-subscribe, and basics of event sourcing
Asynchronous Processing, Event Publishing, and Subscription
Implementing Event-Driven Communication in ASP.NET Core Microservices
Eventual Consistency and Designing Idempotent Event Handlers
Error Handling and Dead-Letter Queues
Use Cases: Order placed, payment received, stock updated, notification sent

Hands-on/Lab:

Implement an OrderPlaced event in the Order microservice and publish it to RabbitMQ.
Create consumers in the Notification and Inventory microservices to process the event asynchronously.
Design idempotent event handlers and handle potential duplicates.
Simulate event replay and test event-driven workflows end-to-end.

Chapter 19: Advanced Messaging with MassTransit

In this chapter, students will learn about advanced messaging techniques using MassTransit, with a focus on message reliability, retries, and fault handling. They will understand how to implement message routing and error handling, as well as how MassTransit ensures that messages are reliably delivered in production systems.

Topics to be Covered:

Introduction to MassTransit and its advantages over raw message brokers
Overview of the MassTransit framework and key features
Supported transports (RabbitMQ, Azure Service Bus, etc.)
Setting up MassTransit in ASP.NET Core microservices
Key concepts: messages, consumers, Sagas, state machines, message contracts
Implementing Sagas for long-running workflows and distributed transactions (e.g., Order fulfillment, Payment, Inventory)
Message routing, retries, and fault handling
Scheduled messages and delayed delivery
Integrating with ASP.NET Core Dependency Injection and Configuration
Monitoring, logging, and diagnostics/tracing in MassTransit workflows

Hands-on Lab:

Set up MassTransit with RabbitMQ in ASP.NET Core microservices.
Build a Saga workflow involving Order, Payment, and Inventory microservices.
Implement request-response and publish-subscribe messaging patterns
Use MassTransit monitoring and diagnostics tools to track message flow and troubleshoot issues

Chapter 20: Implementing CQRS and Event Sourcing

Students will learn how to separate command and query responsibilities using the CQRS pattern. This chapter will introduce them to command handlers and query handlers, as well as how to structure their services for improved scalability and maintainability.

Topics to be Covered:

Introduction to CQRS: rationale, benefits, and challenges
Separating commands (writes) and queries (reads)
Roles of Command Handlers and Query Handlers
Event Sourcing fundamentals: capturing all state changes as an immutable event log
Benefits and challenges of Event Sourcing, including audibility and complexity
Implementing Event Stores in .NET (using EventStoreDB, MediatR, or custom solutions)
Techniques for rebuilding application state from event logs and snapshots
Designing read and write models for scalability and performance
Handling eventual consistency and synchronization between models
Best practices: event schema changes, event versioning, safe event replay
Real-world use cases: order state transitions, audit logging, complex business workflows

Hands-on Lab:

Implement CQRS in the Order microservice by separating command and query models.
Add event sourcing to capture all state changes as events and rebuild the state.
Use MediatR or EventStoreDB to manage event streams
Handle eventual consistency between read and write models
Test command handling, event persistence, and state rebuilding

Chapter 21: GraphQL in Microservices

Students will learn how to utilize GraphQL to construct flexible and efficient APIs that can retrieve data from multiple microservices. This chapter explores the differences between GraphQL and REST APIs, the structure of GraphQL queries, mutations, and subscriptions, and how to integrate GraphQL into a microservices architecture for optimized data retrieval.

Topics to be Covered:

Introduction to GraphQL and Comparison with REST APIs
Understanding GraphQL schema: queries, mutations, and subscriptions
Benefits of using GraphQL in a microservices architecture
Designing GraphQL schemas for multiple microservices
Querying and aggregating data from multiple services using GraphQL
Implementing a GraphQL server with ASP.NET Core (e.g., using HotChocolate or GraphQL.NET)
Handling GraphQL subscriptions for real-time updates
Security considerations in GraphQL APIs (authorization, query complexity)
Performance optimization: batching, caching, and persisted queries
Versioning and evolution of GraphQL schemas
Integrating GraphQL with existing microservices and APIs
Testing and debugging GraphQL endpoints

Hands-on Lab:

Add a GraphQL server using libraries like HotChocolate or GraphQL.NET.
Define GraphQL schema types (queries, mutations, subscriptions) that aggregate data from multiple microservices (e.g., Product, Order, User).
Implement resolvers to fetch data from existing REST or gRPC microservices or databases.
Create queries that support filtering, sorting, and pagination.
Implement mutations for creating and updating resources through GraphQL.
Add real-time subscriptions to receive updates (e.g., order status changes).
Secure the GraphQL endpoint using authentication and authorization policies.
Optimize performance with batching and caching techniques.
Test GraphQL queries, mutations, and subscriptions using tools like GraphiQL or Postman.
Document the GraphQL API and schema using introspection and playground features.

Module 5: Failure Handling, Observability, & Versioning

This module prepares students to design, build, and operate robust, resilient, and observable microservices. Learners will master failure-handling patterns, logging and tracing for deep visibility, and strategies for managing API changes with minimal disruption. The focus is on ensuring uptime, reliability, and maintainability in modern distributed systems.

Chapter 22: Failure Handling

This chapter teaches students how to design resilient microservices by implementing retry patterns, circuit breakers, and fallback methods using the Polly library. Students will also learn how to simulate and handle failures in microservices using Chaos Engineering principles to ensure system robustness in production.

Topics to be Covered:

Understanding types of failures in distributed microservices
Transient vs permanent faults
Retry patterns: immediate retry, exponential backoff, jitter
Circuit Breaker pattern: concepts and use cases
Timeout and Bulkhead isolation patterns
Fallback strategies to ensure graceful degradation
Implementing resilience policies with Polly in ASP.NET Core
Combining multiple resilience policies (retry + circuit breaker + fallback)
Testing resilience using Chaos Engineering principles
Simulating failures and measuring system behavior
Best practices for designing fault-tolerant microservices

Hands-on Lab:

Implement retry policies with exponential backoff and jitter using Polly
Add circuit breaker and fallback policies for critical microservice calls
Combine multiple Polly policies in service calls
Use Chaos Engineering tools to inject faults and observe system behavior
Test system resilience and fallback scenarios

Chapter 23: Observability & Distributed Tracing

Students will learn the concept of observability and how to implement distributed tracing in microservices using tools like Serilog, OpenTelemetry, and Jaeger. They will also explore metrics collection and dashboard creation with Grafana to monitor and track the performance of their microservices.

Topics to be Covered:

What is Observability, and why does it matter in microservices
Pillars of Observability: Logging, Metrics, and Tracing
Centralized logging with Serilog and integration with ELK Stack
Distributed tracing fundamentals and challenges in microservices
Implementing OpenTelemetry instrumentation in ASP.NET Core
Visualizing traces with Jaeger
Collecting and monitoring metrics using Prometheus
Creating dashboards and alerts in Grafana
Correlating logs, traces, and metrics for root cause analysis
Monitoring Microservices health and performance in real-time
Best practices for observability-driven development

Hands-on Lab:

Integrate Serilog for centralized logging and configure structured log output.
Instrument microservices with OpenTelemetry SDK to collect distributed traces.
Visualize traces using Jaeger and correlate logs with trace IDs.
Collect metrics using Prometheus and create Grafana dashboards.
Set up alerts for service health and performance anomalies.

Chapter 24: Versioning and Backward Compatibility

Students will learn how to manage API versioning in microservices, ensuring backward compatibility while supporting newer versions. They will explore strategies for deprecating old versions and maintaining compatibility across different versions of the same service.

Topics to be Covered:

Importance of API versioning in microservices architecture
API versioning strategies: URI versioning, query parameters, headers, and content negotiation
Designing backward-compatible APIs and handling breaking changes
Deprecation policies and communicating changes to API consumers
Implementing API versioning in ASP.NET Core Web API
Versioning considerations for gRPC services and message contracts
Managing multiple active versions in production environments
Testing and validating API versions
Automating documentation with Swagger/OpenAPI for versioned APIs
Strategies for smooth client migration and minimizing downtime during upgrades

Hands-on Lab:

Implement URI-based and header-based API versioning in ASP.NET Core Web API.
Design backward-compatible API changes and version deprecation strategies.
Configure Swagger/OpenAPI documentation to support multiple API versions.
Version gRPC service contracts with protobuf file changes.
Test multiple versions of the same API simultaneously to ensure client compatibility.

Module 6: Containerization & Load Balancing

This module introduces the concepts of containerization and orchestration, which are crucial for deploying and scaling microservices. Students will learn how to use Docker to containerize their microservices and manage multi-container setups using Docker Compose. The module then extends to Kubernetes for container orchestration, focusing on deployment, scaling, service discovery, and load balancing. By the end of this module, students will understand how to deploy their microservices in isolated, reproducible environments and manage them at scale using Kubernetes.

Chapter 25: Docker for Microservices

In this chapter, students will learn the basics of containerization with Docker. They will understand how to containerize microservices, write Dockerfiles, build Docker images, and use Docker Compose to run multi-container setups. This chapter lays the foundation for deploying microservices in isolated, reproducible environments.

Topics to be Covered:

Introduction to containerization and its benefits over traditional virtualization
Docker architecture: Docker Engine, Docker Hub, Docker CLI
Understanding Docker images and containers
Writing Dockerfiles for ASP.NET Core microservices
Building and tagging Docker images
Running containers locally and managing the container lifecycle
Networking basics in Docker containers
Using Docker Compose for multi-container applications
Defining services, networks, and volumes in docker-compose.yml
Building a complete microservices solution with Docker Compose
Best practices for Dockerfile creation and image optimization
Debugging and troubleshooting Docker containers

Hands-on Lab:

Write Dockerfiles for ASP.NET Core microservices and build Docker images.
Run microservices as containers locally using the Docker run command.
Create a docker-compose.yml to orchestrate multi-container microservice environments.
Manage networks, volumes, and environment variables in Docker Compose.
Debug and troubleshoot containerized microservices.

Chapter 26: Kubernetes (K8s) for Microservices

This chapter teaches students how to use Kubernetes to manage and orchestrate containerized microservices. Students will learn about Kubernetes architecture, deploy microservices on Kubernetes clusters, and manage services with Kubernetes using YAML manifests. They will also gain hands-on experience with basic Kubernetes commands.

Topics to be Covered:

Overview of Kubernetes and container orchestration fundamentals
Kubernetes architecture: Master node, worker nodes, API Server, Scheduler, Controller Manager
Key Kubernetes objects: Pods, Deployments, ReplicaSets, Services, ConfigMaps, Secrets
Deploying ASP.NET Core microservices to Kubernetes clusters
Writing Kubernetes YAML manifests for deployments and services
Managing deployments: rolling updates, rollbacks, and scaling
Service discovery and load balancing in Kubernetes
Using kubectl CLI for cluster management and troubleshooting
Configuring persistent storage for microservices
Namespaces and resource quotas for multi-tenant cluster management
Introduction to Helm charts for Kubernetes application packaging
Monitoring Kubernetes clusters with built-in tools

Hands-on Lab:

Deploy microservices to a local Kubernetes cluster (e.g., Minikube or Docker Desktop).
Write Kubernetes manifests (Deployment, Service, ConfigMap, Secret) for microservices.
Use kubectl commands to manage pods, deployments, and services.
Perform rolling updates, rollbacks, and horizontal pod autoscaling.
Configure persistent storage and namespaces for multi-tenant management.
Package microservices as Helm charts and deploy via Helm.

Chapter 27: Load Balancing

Students will learn about the importance of load balancing in microservices. The chapter will cover various load-balancing strategies to ensure that traffic is efficiently routed.

Topics to be Covered:

Importance of load balancing in microservices architecture
Types of load balancing: client-side, server-side, and DNS-based
Layer 4 (Transport) vs Layer 7 (Application) load balancing
Load balancing algorithms: round-robin, least connections, IP hash, weighted load balancing
Load balancing in Kubernetes using Services of type LoadBalancer and Ingress controllers
Implementing load balancing with cloud providers (AWS ELB, Azure Load Balancer)
Traffic routing strategies: blue-green deployment, canary releases, and A/B testing
Health checks and failover mechanisms in load balancers
Configuring load balancing for stateful vs stateless microservices
Performance considerations and scaling with load balancing

Hands-on Lab:

Configure Kubernetes Service of type LoadBalancer and Ingress controller to expose microservices.
Implement different load balancing algorithms (round-robin, least connections) using Ingress rules or cloud load balancers.
Set up health probes and readiness/liveness checks for pod monitoring.
Simulate traffic routing strategies, such as blue-green deployments and canary releases.
Monitor load balancer performance and failover behavior.

Chapter 28: Service Mesh in Microservices

Introduction to Service Mesh architecture and tools like Istio and Linkerd for advanced microservice traffic management, security, and observability.

Topics to be Covered:

What is a Service Mesh, and why does it matter in microservices
Core features of service meshes: traffic routing, load balancing, retries, circuit breaking
Security features: mutual TLS (mTLS) for secure service-to-service communication
Observability: metrics, distributed tracing, and logging integration
Policy enforcement: access control, rate limiting, and quota management
Popular Service Mesh tools overview: Istio, Linkerd, Consul Connect
Architecture components: control plane and data plane
Integrating a Service Mesh with Kubernetes-based microservices
Use cases and benefits for microservice deployments
Challenges and considerations when adopting Service Mesh

Hands-on Lab:

Deploy a sample microservices application on Kubernetes with Istio or Linkerd.
Configure mTLS between services for secure communication
Set up traffic routing rules and fault injection policies
Collect and analyze telemetry data (metrics and traces) via service mesh dashboards

Chapter 29: CI/CD Pipelines for Microservices

Students will learn how to automate the deployment process using CI/CD pipelines. This chapter covers the concepts of continuous integration and delivery, as well as how to set up pipelines using tools like GitHub Actions to automate the build, test, and deployment processes for their microservices.

Topics to be Covered:

Introduction to Continuous Integration (CI) and Continuous Deployment/Delivery (CD)
Benefits of CI/CD in microservices environments
Overview of CI/CD tools and platforms with a focus on GitHub Actions
Setting up GitHub repositories and workflows for ASP.NET Core microservices
Automating build and test processes in CI pipelines
Configuring multi-stage pipelines for build, test, and deployment
Managing secrets and environment variables securely in CI/CD pipelines
Deployment strategies: rolling updates, blue-green deployments, canary releases
Integrating automated tests (unit, integration, end-to-end) into pipelines
Monitoring and alerting on pipeline status and deployment health
Troubleshooting common CI/CD pipeline issues
Best practices for scaling CI/CD across multiple microservices

Hands-on Lab:

Set up a GitHub repository for your ASP.NET Core microservices solution.
Create a GitHub Actions workflow file (.github/workflows/ci-cd.yml) to automate the build process, including restoring dependencies, building the project, and running unit tests.
Extend the workflow to include deployment stages for different environments (e.g., staging and production) using Docker containers or Kubernetes manifests.
Configure secure storage and usage of secrets and environment variables in GitHub Actions.
Automate integration and end-to-end tests as part of the pipeline.
Implement multi-stage pipelines with approval gates for deployment.
Monitor pipeline runs, troubleshoot failed jobs, and set up notifications.
Test rolling deployments and rollback mechanisms through the pipeline.

Chapter 30: Testing Strategies for Microservices

Students will understand the differences between unit, integration, contract, and end-to-end testing in a distributed system and learn how to implement automated tests to ensure the reliability and maintainability of microservices.

Topics to be Covered:

Introduction to Microservices Testing Challenges
Unit Testing
Integration Testing
End-to-End (E2E) Testing
Test Data Management
Performance and Load Testing

Hands-on Lab:

Create unit tests for domain models and service layers using xUnit and Moq.
Develop integration tests for API controllers using ASP.NET Core TestServer and in-memory databases.
Write end-to-end API tests for an order placement workflow across multiple services using Postman.
Test asynchronous message handling in the Notification microservice with MassTransit in-memory transport.

Note: If we have missed any topics, if new features are introduced, or if you would like to learn concepts not covered in this Microservices using ASP.NET Core Web API Syllabus, please let us know, and they will also be included in this course. If you have any questions, please don’t hesitate to contact us.

Prerequisites for Microservices Using ASP.NET Core

Before diving into microservices with ASP.NET Core, you should have:

Basic Knowledge of C#: Understanding of the C# programming language.
Familiarity with ASP.NET Core: Basic experience with the ASP.NET Core framework.
Understanding of RESTful Services: Knowledge of building and consuming RESTful APIs.
Basic Docker Knowledge: Familiarity with containerization concepts (optional but beneficial). We will cover this in our training.

Enroll Today!

Ready to take your software development skills to the next level? Join our comprehensive online training on Microservices using ASP.NET Core and become proficient in building modern, scalable applications. This course is not just about learning technology; it’s about transforming your ability to create software in a way that’s aligned with the modern demands of flexibility, scalability, and maintainability. Enroll in our comprehensive online training course today and take the first step towards becoming a microservices expert.

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About the Author: Pranaya Rout

Pranaya Rout has published more than 3,000 articles in his 11-year career. Pranaya Rout has very good experience with Microsoft Technologies, Including C#, VB, ASP.NET MVC, ASP.NET Web API, EF, EF Core, ADO.NET, LINQ, SQL Server, MYSQL, Oracle, ASP.NET Core, Cloud Computing, Microservices, Design Patterns and still learning new technologies.