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Docker revolutionized software deployment by making applications portable, consistent, and easy to distribute. This comprehensive guide covers everything from Docker fundamentals to production-ready practices.

What is Docker?

Docker is a platform for developing, shipping, and running applications in containers. It packages an application with all its dependencies into a standardized unit called a container.

Why Docker Matters

Before Docker:

• “It works on my machine” syndrome
• Complex deployment procedures
• Environment inconsistencies
• Dependency conflicts
• Slow onboarding for new developers

With Docker:

SOLID principles are often taught as fundamental rules, but at the architect level, they’re guidelines that require judgment, trade-offs, and contextual application.

Beyond the Textbook: SOLID in Practice

Rigid adherence to any principle can be as harmful as ignoring it entirely.

The real skill lies in understanding:

• When each principle adds value
• What you’re trading off by applying it
• How principles interact and sometimes conflict
• Why context matters

Single Responsibility Principle (SRP)

“A class should have one, and only one, reason to change.”

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WebSocket is a two-way, full-duplex protocol utilized in client-server communication contexts. As a stateful protocol, the connection between the client and server remains active until terminated by either party. Once the connection is closed by either the client or server, the connection ends on both sides.

Sample webSocket URI

A WebSocket URI has the following format:

ws://hostname:port/path?query

For secure WebSocket connections, the scheme would be wss:

wss://hostname:port/path?query

Here’s an example of a WebSocket URI:

NetMQ is a .NET library that provides a high-level API for several messaging patterns, allowing applications to communicate with each other over a network. It’s a 100% native C# port of the lightweight messaging library ZeroMQ.

NetMQ is transport-agnostic and can work over several transports such as inproc (inter-thread, inter-process), IPC (inter-process), TCP, and more. It’s designed to handle high load, is very flexible, and doesn’t require a dedicated message broker.

I recently had the need to create a self-signed certificate for one of our web applications wherein the browser does not display a warning message indicating Your connection is not private with the error NET::ERR_CERT_AUTHORITY_INVALID. It was necessary to create certificates for several domains, such as www.subdomain.example.com and www.myblog.sample.com.

A self-signed SSL/TLS certificate must be an X.509 version 3 multidomain SAN certificate and requires a root certificate.

A single certificate can be created for both domains using Subject Alternative Name (SAN).