Explainer
Attach to a Docker process and detach safely
Understand stream attachment, interactive detach keys, signal forwarding, and when logs or exec are the better fit.
Explainer
Rename Docker image references and containers
Add an image tag without copying layers, remove the old reference deliberately, and rename containers without confusing deployment identity.
Explainer
Troubleshoot container connections to host services
Compare host.docker.internal, Linux bridge addresses, and host networking, then test resolution, listeners, routing, and protocol.
Explainer
Connect to PostgreSQL running in Docker
Publish a deliberate host endpoint, initialize credentials correctly, and distinguish network reachability from PostgreSQL authentication.
Explainer
Debug a failed Docker build
Read the first meaningful failure, inspect build inputs, and create a named debug stage instead of treating BuildKit cache IDs as runnable images.
Explainer
Detach from Docker without stopping the container
Use the detach sequence in a compatible interactive session and understand how logs, exec, and restart policies differ.
Explainer
Open a new terminal in a running container
Start an exec shell with the intended user and working directory, or inspect a minimal image without assuming it has shell tools.
Explainer
Run multiple startup commands with Docker Compose
Invoke a shell explicitly, preserve exit status and signals, and move complex initialization into a testable script.
Explainer
Publish multiple ports from a Docker container
Use repeated port mappings, select host interfaces and protocols, and verify each listener through its real client path.
Explainer
Can Docker publish another port on a running container?
Separate port inspection from publication and choose recreation or an external forwarding layer without editing daemon metadata.
Explainer
Fix “Cannot connect to the Docker daemon”
Check the selected endpoint, daemon availability, and permissions in that order, with separate paths for Linux, Desktop, WSL, and remote engines.
Explainer
Trace a Docker client-to-daemon connection failure
Follow the selected context through its socket or transport to the daemon logs instead of resetting settings or reinstalling blindly.