Explainer
Use SSH credentials in Docker without baking in private keys
Choose scoped runtime mounts or agent forwarding, use BuildKit SSH mounts during builds, and verify server host keys.
Explainer
Do you need sudo inside a Docker container?
Check the configured user first, use deliberate build or exec privileges, and avoid turning a non-root runtime into unrestricted root.
Explainer
Inspect the files and layers in a Docker image
Explore a trusted image with a shell, export a stopped container filesystem, or inspect layer history and configuration.
Explainer
Use files outside the default Docker build context
Select a broader context or an explicit named context, and distinguish local paths from stages, images, Git sources and stdin builds.
Explainer
List Docker containers and filter the results
Find running or stopped containers, inspect useful status fields, and select a deliberate scope before bulk operations.
Explainer
Bind-mount a host directory into a Docker container
Choose an explicit host path, distinguish runtime mounts from image copies, and diagnose permissions and file-sharing behavior.
Explainer
Understand Docker environment variable precedence
Separate image defaults, container configuration, Compose interpolation, and process-local changes when a variable has an unexpected value.
Explainer
Open an interactive shell with Docker Compose
Choose exec for a running service or run for a disposable command, and understand when attach controls the main process.
Explainer
Why a detached Docker container stops
Detached mode changes terminal attachment; the main process, stop signals, and restart policy determine the container lifecycle.
Explainer
Remove old stopped Docker containers
Select disposable containers deliberately, understand prune age filters, and preserve data before scheduling cleanup.
Explainer
Clean up unused Docker images
Distinguish dangling images from unreferenced images, preserve rollback assets, and keep local cleanup separate from registry retention.
Explainer
Run a Docker image as a container
Create a container with the intended command, ports, mounts, and environment, then distinguish a new run from restarting an existing instance.