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Aporeon

Technical interview practice, from one developer to another.

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Containers & Runtime Essentials

Container fundamentals, production images, configuration, security, networking, health, shutdown, resource limits, orchestration, safe releases, and incident diagnosis.

15 drillsPractice one at a timeOrdered pathConcept questionArchitecture scenario

Recommended start

Containers vs virtual machines

Explains process isolation, shared kernels, image-based deployment, and where containers differ operationally from virtual machines.

Easy~5 minStep 1 of 15

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1Containers vs virtual machinesRecommended startExplains process isolation, shared kernels, image-based deployment, and where containers differ operationally from virtual machines.Concept questionEasy~5 min.NETASP.NET CoreDockerPractice 2Production .NET ContainerBuilds a small, immutable, non-root .NET runtime image with controlled inputs, external configuration, graceful lifecycle behavior, and a practical patching strategy.Concept questionMedium~7 min.NETASP.NET CoreAzurePractice 3Docker build cachingBuilds deterministic images efficiently by controlling context, restore layers, dependency inputs, and cache invalidation.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 4Image identity and patchingUses immutable image identity, controlled promotion, registry security, and deliberate base-image rebuilding instead of mutable latest tags.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 5Container configurationKeeps images environment-neutral while handling configuration precedence, secret delivery, rotation, and startup validation safely.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 6Non-root container securityReduces container privileges through non-root execution, minimal images, controlled filesystems, and explicit capability requirements.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 7Container networkingExplains bind addresses, published ports, internal DNS, service identity, and why localhost changes meaning across container boundaries.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 8Container health probesSeparates traffic eligibility, process recovery, and slow startup so health checks do not amplify dependency failures or restart healthy work.Architecture scenarioHard~12 min.NETASP.NET CoreDockerPractice 9Graceful container shutdownHandles SIGTERM, traffic draining, cancellation, background work, and termination deadlines without losing accepted work or hanging rollout.Architecture scenarioHard~12 min.NETASP.NET CoreDockerPractice 10Container resource limitsConnects orchestrator requests and limits to .NET GC, thread-pool behavior, throttling, OOM termination, and capacity planning.Architecture scenarioHard~12 min.NETASP.NET CoreDockerPractice 11Container state and logsSeparates ephemeral instance files from durable data and sends logs, uploads, caches, and diagnostics to storage with explicit lifecycle ownership.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 12Docker Compose locallyUses Compose for reproducible local dependencies while preserving fast inner loops, realistic readiness, and clear differences from production orchestration.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 13Kubernetes building blocksExplains the small set of Kubernetes resources needed to run and expose a replicated stateless API without drowning the answer in platform vocabulary.Concept questionMedium~7 min.NETASP.NET CoreDockerPractice 14Rolling deploys and migrationsCoordinates old and new application versions, expand-and-contract schema changes, migration ownership, readiness, and rollback during rolling releases.Architecture scenarioHard~12 min.NETASP.NET CoreDockerPractice 15Diagnose container failuresUses instance state, termination reasons, events, logs, configuration, probes, and resource evidence to distinguish common container startup failures.Architecture scenarioHard~12 min.NETASP.NET CoreDockerPractice

Practice order

15 drillsOne at a time

1Containers vs virtual machinesUp next / Easy / ~5 min
2Production .NET ContainerMedium / ~7 min
3Docker build cachingMedium / ~7 min
4Image identity and patchingMedium / ~7 min
5Container configurationMedium / ~7 min
6Non-root container securityMedium / ~7 min
7Container networkingMedium / ~7 min
8Container health probesHard / ~12 min

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