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CODE FARM

WebSockets and Server-sent events

15 May 2024

1. WebSockets WebSocket, standardized by the IETF as RFC 6455 in 2011, is a computer communications protocol, providing a simultaneous two-way communication channel over a single Transmission Control Protocol (TCP) connection. [1] The WebSocket is designed to work over HTTP ports 80 and 443 as well as to support HTTP...
AI and Large Language Models

06 May 2024

1. What is AI? Simply put, AI is software that imitates human behaviors and capabilities. Key workloads include: [1] Machine learning - This is often the foundation for an AI system, and is the way we "teach" a computer model to make predictions and draw conclusions from data. Computer vision...
HTML Learning Notes

29 Apr 2024

/* TODO */
CSS Learning Notes

26 Apr 2024

Cascading Style Sheets (CSS) is a stylesheet language that describes how HTML and XML documents are presented across different media types (screen, print, speech, etc.). 1. Basics CSS is a rule-based language where each rule consists of property-value pairs applied to elements selected by a selector, with properties and values...
JavaScript Learning Notes

15 Apr 2024

JavaScript is a cross-platform, prototype-based, object-oriented scripting language. The core language of JavaScript is standardized by the ECMA TC39 committee as a language named ECMAScript. Among other things, ECMAScript defines: Language syntax (parsing rules, keywords, control flow, object literal initialization, …) Error handling mechanisms (throw, try…catch, ability to create user-defined...
Host .NET in Windows Service

02 Apr 2024

1. .NET Generic Host The .NET Generic Host, available in the Microsoft.Extensions.Hosting NuGet package, is responsible for app startup and lifetime management. A host is an object that encapsulates an app’s resources and lifetime functionality, such as: [1] [2] Dependency injection (DI) Logging Configuration App shutdown IHostedService implementations When a...
OpenSSH management

26 Mar 2024

The Secure Shell Protocol (SSH), designed on Unix-like operating systems, is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution. SSH uses public-key cryptography to authenticate the remote computer and allow it to authenticate the user,...
What is Helm

09 Mar 2024

Helm is a package manager for Kubernetes that uses a packaging format called charts, and is implemented into two distinct parts: Helm Client and Helm Library. [1] Helm installs charts into Kubernetes, creating a new release for each installation. And to find new charts, you can search Helm chart repositories....
Kubernetes Volumes

29 Feb 2024

1. Docker Storage Drivers and Volumes Docker uses storage drivers to store image layers, and to store data in the writable layer of a container. [1] Storage drivers are optimized for space efficiency, but (depending on the storage driver) write speeds are lower than native file system performance, especially for...
Service Mesh

29 Feb 2024

Istio addresses the challenges developers and operators face with a distributed or microservices architecture. [1] Figure 1. By adding a proxy "sidecar" along with every application deployed, Istio lets you program application-aware traffic management, incredible observability, and robust security capabilities into your network. 1. What is a Service Mesh Modern...
CI/CD Builds on Jenkins

26 Jan 2024

The controller is a central, coordinating process which stores configuration, loads plugins, and renders the various user interfaces for Jenkins. An agent is typically a machine, or container, which connects to a Jenkins controller and executes tasks when directed by the controller. A node is a machine which is part...
What is the docker0 in Docker

25 Jan 2024

TL.DR: The docker0 is the default bridge when starting the Docker daemon. 1. Docker network overview Container networking refers to the ability for containers to connect to and communicate with each other, or to non-Docker workloads. [1] Containers have networking enabled by default, and they can make outgoing connections. A...
Install a Kafka cluster in KRaft mode

12 Jan 2024

Apache Kafka Raft (KRaft, pronounced craft) is the consensus protocol that was introduced in KIP-500 to remove Apache Kafka’s dependency on ZooKeeper for metadata management. KRaft mode makes use of a new quorum controller service in Kafka which replaces the previous controller and makes use of an event-based variant of...
How to produce and consume events on Kafka with Spring Stream

06 Jan 2024

How to produce and consume events on Kafka with Spring Stream? How to produce and consume events on Kafka with Spring Stream? Apache Kafka is a highly popular option for data streaming. Spring Cloud Stream is a framework built upon Spring Boot for building message-driven microservice applications and it provides...
Generics in .NET

26 Dec 2023

Generics in .NET tailor methods, classes, structures, or interfaces to the precise data type it acts upon to increase code reusability and type safety. [1] For example, List<T> provides type safety and avoids boxing and unboxing overhead compared to using the non-generic ArrayList collection, and Dictionary<TKey, TValue> provides type safety...
Delegates and Lambdas, Events in .NET

25 Dec 2023

Delegates, acting as type-safe function pointers, provide the foundation for dynamic method invocation, and treat methods as first-class citizens, passing them as arguments and storing them in variables. Lambdas, concise anonymous functions, offer a streamlined way to define these methods inline, often simplifying delegate creation. Events, built upon the powerful...

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