Containerization skill assessment
Build small, run safe, ship anywhere.
What it covers
Images & Layers
Understand how images are built from stacked, cached layers and addressed by tags/digests. This governs build speed, image size, and reproducibility.
Union/overlay filesystem and layer cachingImage vs container; writable layer & copy-on-writeTags vs immutable digestsOCI image spec and registriesReducing image size
Dockerfiles & Builds
Runtime & Networking
Know how containers run as processes, handle signals as PID 1, and talk to each other and the host over networks.
Container lifecycle and PID 1 signal/zombie handlingPort publishing with -pbridge vs host vs none networksDNS-based service discovery between containersRestart policies
Storage & Data
Compose & Multi-container
Security
Shrink the container attack surface: drop privileges, minimize capabilities, and keep secrets out of images.
Running as non-root (USER) and rootless modeDropping Linux capabilities; avoiding --privilegedRead-only root filesystemImage scanningWhy secrets in ENV/ARG/layers leak
Registries & Distribution
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