Tagged “docker”

Docker Compose Cheatsheet

Quick reference for running Bachelor Point's local Docker stack (`docker-compose.yml`) with Docker Desktop — building the image, applying Prisma migrations, and managing the `db`, `migrate` and `app` containers.

Stack overview All commands below assume your terminal's working directory is the project root (where docker compose.yml lives). Docker Compose reads .env in that same folder autom…

How to Run This NestJS Blog Project in Docker: Building the Image, Starting the Container, and Opening It

A step-by-step guide for students new to Docker — three commands take you from source code to a running blog at localhost:3000, with an explanation of what each one does.

Goal Run this blog on your own machine inside a Docker container, without installing Node.js. Everything the project needs — Node 20, the dependencies, the compiled code — is built…

A step-by-step guide to the CI/CD journey: understand each component's role, trace a commit from development to production, and see a real Jenkins pipeline in action

Part 1 — The Roles: Who Does What People often blur these three together. They are separate concerns: | Piece | What it actually is | Responsibility | | CI/CD | A practice / method…

A practical guide covering Docker fundamentals, intermediate workflows, advanced techniques, and industry best practices — with .NET / ASP.NET Core examples.

Part 1 — Beginner 1.1 What Problem Does Docker Solve? "It works on my machine" happens because the application depends on things outside the code: OS version Runtime version (.NET…

Ensuring the Same Configuration Across Development, QA, and Production

One of the biggest deployment challenges is making sure the application behaves consistently across all environments while allowing environment-specific settings (like connection strings and API keys).

1. Keep Configuration Outside the Code (12 Factor App) Never hardcode environment specific values. Bad Good Store values in configuration files, environment variables, or a secret…

A small disk fills faster than you think

Image layers accumulate quietly on a 6.6 GB volume

A single pipeline run moved disk usage from 52.8% to 60.6% on a 6.6 GB root volume — roughly 500 MB per build. Every run writes a fresh set of image layers, and nothing removes the…

Two users, one Docker socket

Test permissions as the user that will run the command

Group membership does not apply to an already-running process.

Jenkins runs as its own system user. The permission that matters is the jenkins user's, not yours. Test it the way Jenkins will: If that fails with a socket permission error: The r…

Why your Docker build takes four minutes every time

Layer caching is ordering-sensitive, and most Dockerfiles get the order wrong

Docker caches each instruction as a layer. When one changes, that layer and every layer after it is rebuilt. So the order of your Dockerfile decides your build time. The common mis…