How do I make a production container safer and smaller?

Definition:

A production image should contain the application and required runtime dependencies with no unnecessary development tools or embedded credentials. Runtime restrictions then reduce what a compromised process can access or change. Image size helps distribution, but maintenance and permissions are equally important.

Key points:

• Install needed runtime dependencies and run as a non-root user.

• Keep secrets out of image layers; provide them securely at runtime.

• Use a maintained base image, scan dependencies and handle shutdown signals.

• Use lockfiles and deliberate base-image updates so rebuilds remain understandable and patched.

Interview point:

• Non-root execution reduces risk but does not replace application security, dependency updates or secret handling.