Docker

What is Docker?

Docker is an open-source platform for developing, shipping, and running applications inside containers. A container bundles an application with its dependencies, libraries, and configuration, so the same image runs the same way on a laptop, a test server, and production.

This solves a problem that used to cost teams entire afternoons. Before containers, software often behaved differently across environments because the underlying systems were configured differently. A feature that worked on a developer's machine could fail in production over a missing library or a version mismatch. Docker isolates the application from the host, so "it works on my machine" stops being an excuse. Containers are lighter than virtual machines because they share the host operating system's kernel instead of each running a full OS, which means they start in seconds and use far less memory.

Docker rarely works alone at scale. Orchestration tools like Kubernetes manage how containers deploy, scale, and recover across clusters of machines. Together they form a common backbone for modern deployment, where the same artifact moves cleanly from a developer's commit through to live traffic.

Docker at Dallonses

Containers are how we keep environments honest. When we package an application in Docker, the version a client sees in staging is the version that reaches production, byte for byte. That removes a whole category of bugs that only appear once code leaves a developer's desk.

It also sits at the centre of our CI/CD pipelines. Each build produces a container image, runs through automated checks, and deploys without manual steps that drift over time. Continuous delivery only works when the thing you test is the thing you ship, and Docker is what makes that guarantee real on the projects we run.

Need an app that behaves the same everywhere it runs? Let's set that up.

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