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Practical Taxonomy of Software Design

Understanding the differences between software architecture, architectural design, styles, patterns, design approaches, and principles is crucial for making thoughtful decisions. Unfortunately, these terms are often mixed up or used as if they mean the same thing. This article explains what each term means, where it fits in the design hierarchy,

architecture

Hexagonal Architecture

By clearly defining boundaries between various system components, the main aim is to separate the application's essential business logic from its external concerns.

architecture

Containers: Technology Landscape

This post looks at the history of containerization and shows the technology landscape that makes it possible.

security

Kestrel and the chain of trust

Presenting a public key certificate issued by an intermediate certificate authority, using Kestrel, only presents the leaf certificate and does not include the intermediate certificate.

observability

Elastic Agent: unexpected EOF

Elastic Agent fails to connect to Elasticsearch with unexpected EOF error message.

architecture

ASP.NET Core API Versioning

There are several versioning strategies that can be used to version ASP.NET Core APIs. In this post we will have a look at the various versioning strategies, how to implement them, and configure Swagger.

observability

Observability in ASP.NET Core with Elasticsearch and Serilog

In this post we'll look at what observability is and how it can be done with the Elasticsearch Platform and Serilog for ASP.NET Core applications.

security

Setting up the Elasticsearch keystore for a containerized environment

The Elasticsearch keystore is a vital component in the Elasticsearch security architecture. But, how do we create the keystore file before starting Elasticsearch in a containerized environment?

architecture

Blue-Green Deployments with Containers and Traefik

Minimising downtime when deploying a new version of your application is not an easy feat. In this post we will explore the blue-green deployment strategy.

observability

eBPF

Initially, the Berkeley Packet Filter (BPF) was created to filter out or discard unwanted network packets in the kernel space instead of user space for performance reasons. eBPF (enhanced Berkeley Packet Filter) on the other hand, extends the original BPF functionality to run sandboxed programs in a privileged context. In

security

OAuth 2.0 Demystified: Client Types

OAuth 2.0 defines two types of client applications, viz., a confidential client and a public client.

security

OAuth 2.0 Demystified: Tokens

The OAuth 2.0 Authorization Framework defines two token types viz., an Access Token and a Refresh Token.

security

OAuth 2.0 Demystified: Four Authorization Grant Types

The OAuth 2.0 Authorization Framework specifies four grant types: authorization code, implicit, resource owner password, and client credentials. This post describes the four flows at a high level.

security

OAuth 2.0 Demystified: Swagger UI as a Client

In this post I will show you to configure Swagger-UI so that you can authenticate and authorize access to the secured endpoints in your API.

security

OAuth 2.0 Demystified: Understanding the Four Roles

The OAuth 2.0 Authorisation Framework or, OAuth 2.0, is defined in RFC6749. It is an authorisation specification. By authorisation we specifically mean to grant someone access to something you own such as your banking transactions. Let's assume that I have created the best alternative banking mobile

architecture

Designing a Microservice Chassis: Health Checks

A microservice chassis provides two things, build logic and cross-cutting concerns to the services that are built on top of the chassis. In this post we'll look at Health Checks.

security

Service-to-Service Authentication using mTLS

In the microservices world it may be necessary for one microservice to call another microservice. However, the calls between the microservices must be authenticated in order to achieve Zero Trust (ZT). That is, no implicit trust is granted, ever. Just because the microservices are on the same network or is

security

Containers and Integrated Windows Authentication

Authenticating to Microsoft SQL Server from a Linux container using Integrated Windows Authentication.

architecture

Designing a Microservice Chassis: Externalized Configuration

A microservice chassis provides two things, build logic and cross-cutting concerns to the services that are built on top of the chassis. In this post we'll look at the externalized configuration.

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