Explainer
Find logs for a Django application behind Nginx
Trace errors across Nginx, the application server, and Django logging, including legacy FastCGI deployments and modern WSGI or ASGI setups.
Explainer
Why Python classes inherit from object
Understand implicit object inheritance in Python 3, the historical Python 2 distinction, and the limits of default equality, hashing, and super.
Explainer
Run Python on Android
Choose an Android Python app, a Termux environment, remote execution, or an embedded Python application based on dependencies and lifecycle needs.
Explainer
Reach a host service from a Docker container
Use host.docker.internal or host networking with the right platform settings, listener address, and protocol.
Explainer
Transfer Docker images without a registry
Save image archives, transfer and verify them, then load the intended tags and platform variants on another host.
Explainer
Copy files out of a Docker container
Retrieve files from running or stopped containers, handle directory and ownership rules, and use remote contexts correctly.
Explainer
Copy files into a Docker container
Use docker cp for temporary changes, handle ownership and destination paths, and distinguish restart from recreation.
Explainer
Remove Docker images and reclaim local disk space
Choose image pruning or an intentional full reset, account for containers and volumes, and verify reclaimed storage.
Explainer
CMD and ENTRYPOINT in a Dockerfile
Understand default commands, argument replacement, exec versus shell form, and signal handling at container startup.
Explainer
Docker Compose ports versus expose
Publish a port deliberately and understand why expose neither starts a listener nor enforces network isolation.
Explainer
Docker images and containers: what changes at runtime?
Distinguish immutable image content from a container instance, its writable layer, mounted data, and lifecycle.
Explainer
RUN versus CMD in a Dockerfile
Separate build steps from startup defaults, understand cache reuse, and keep image construction reproducible.