Containerised applications that run the same everywhere
Docker packages an application and its dependencies into a container image that runs consistently on a laptop, a test server or the cloud. It is the standard way to make deployments repeatable and environments predictable.
Containers remove most "works on my machine" problems, simplify onboarding and make it easier to move between hosting providers. They also add a layer to understand: images need to be kept small, patched and free of secrets, and persistent data must live outside the container. For a single simple site on managed hosting, containers may be unnecessary. For anything with several services or frequent deployments, Docker is usually worth adopting early.
What we build with Docker
- Dockerfiles and lean images
- Local development environments
- Compose setups for multi-service apps
- Image scanning and patching
- Container-based CI/CD pipelines
Docker questions
Do we need Docker if we already have a server?
Not necessarily, but containers make deployments repeatable and servers easier to replace. For teams deploying often, the consistency usually pays off.
Is Docker the same as Kubernetes?
No. Docker builds and runs containers; Kubernetes orchestrates many containers across many machines. Many applications only need the former.
How do you keep Docker images secure?
We use minimal official base images, run containers as a non-root user, scan images for known vulnerabilities in the pipeline and rebuild regularly to pick up security patches.
Why are our Docker images so large and slow to build?
Usually because build tools and caches end up in the final image or layers are ordered badly. Multi-stage builds and careful layer ordering typically make images smaller and builds faster.
Can Docker help new developers get started faster?
Yes. A Docker Compose setup lets a developer run the application, database and supporting services with one command, matching production far more closely than a hand-built laptop setup.
Where should we run our Docker containers in production?
Options include a single server with Compose, a managed container service such as Cloud Run, ECS or App Platform, or Kubernetes. We match the choice to your scale and team.
How do you handle secrets and configuration in containers?
Secrets are injected at runtime from a secrets manager or environment settings, never baked into images, so the same image can move safely from testing to production.
Can you containerise an older application?
Usually, yes. Most legacy web applications can be containerised with some work on configuration, file storage and logging, which often makes them easier to host and upgrade.
Does using Docker tie us to a particular cloud?
No. Container images follow an open standard, so they run on any major cloud or your own servers, which makes changing providers considerably easier.
Where do you store our Docker images?
In a private registry owned by you, such as your cloud provider's registry or GitHub Container Registry, with access limited to your pipelines and team.
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