Track 4: Docker, Kubernetes, Cloud, Observability & Security⏱️ 35 minFREE TO READ

Enterprise Containerization: Multi-Stage Builds & Kubernetes Security

Build non-root, hardened Docker images under 150MB and write Kubernetes manifests with liveness/readiness probes and resource quotas.

📖 Core Concepts 📝 Checkpoint 🛠️ Project Lab 🎙️ Interview Simulations

🎯 What You Will Be Able to Do

•Write multi-stage Dockerfiles that eliminate compilers and build tools from runtime.
•Run containers as non-root users to satisfy InfoSec CIS benchmarks.
•Configure Kubernetes resource requests, limits, and probe thresholds.

📋 Knowledge Required Beforehand

•Basic Docker and shell commands

SECTION 1 • ARCHITECTURE CONCEPTS & SYSTEM PATTERNS

Free to Read

Enterprise Container Standards

Enterprise clients scan every image you deliver through vulnerability scanners like Prisma Cloud, Snyk, or Trivy. If your image contains CVEs or runs as root, your pilot is stopped immediately.

dockerfile

# Stage 1: Build stage with dependencies and compilers
FROM python:3.12-slim AS builder
WORKDIR /app
RUN apt-get update && apt-get install -y --no-install-recommends gcc build-essential
COPY requirements.txt .
RUN pip install --user --no-cache-dir -r requirements.txt

# Stage 2: Hardened Runtime Container
FROM python:3.12-slim AS runtime
WORKDIR /app
# Security: Create non-root user
RUN groupadd -g 10001 appgroup && useradd -u 10001 -g appgroup appuser
# Copy only compiled packages from builder
COPY --from=builder /root/.local /home/appuser/.local
COPY --chown=appuser:appgroup src/ ./src

ENV PATH=/home/appuser/.local/bin:$PATH
USER 10001:10001
EXPOSE 8080
HEALTHCHECK --interval=30s --timeout=3s --retries=3   CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8080/health')"
CMD ["uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8080"]

SECTION 2 • KNOWLEDGE CHECKPOINT & OBJECTIVE ASSESSMENT

📝Knowledge Checkpoint • 3 Questions

Knowledge Checkpoint: Containerization & K8s Security

Passing threshold: 70%

Q1Single Choice

30 pts

Why do enterprise InfoSec policies (e.g. SOC2, FedRAMP) mandate running container workloads as a non-root user (`USER 10001`)?

Q2Multiple Select

35 pts

Which Kubernetes `securityContext` settings are standard for enterprise production deployments? (Select all that apply)

Q3Architectural Explanation

35 pts

A newly deployed FDE microservice in Kubernetes crashes repeatedly with status `OOMKilled` (Exit Code 137). How do you diagnose and resolve this issue?

Formulate your technical explanation, then verify against the evaluation criteria below:

Self-Evaluation Quality Checklist:

Inspect pod events via `kubectl describe pod` and container memory consumption via metrics/logs.Identify whether memory spike is caused by unconstrained batch ingestion or an overly restrictive `resources.limits.memory` in the deployment manifest.Adjust `resources.requests.memory` and `limits.memory` proportionally, or optimize code to stream records in generators rather than buffering entire datasets into memory.

SECTION 3 • ENTERPRISE HANDS-ON PROJECT LAB

🛠️Hands-on Project Lab • Intermediate • ~40m

Lab 7: Hardened Multi-Stage Dockerfile & K8s Security Manifests

Specification & Code Workspace (dockerfile):

Auto-saved to your browser session • Secure offline workspace

Lab Acceptance Criteria & Deliverables Checklist:0 of 3 verified

Separates build tools from runtime container.Security

Runs as non-root user UID 10001.Security

Configures K8s securityContext with read-only root and dropped capabilities.Architecture

Work is saved automatically • Switch tabs to inspect hints or deliverables

🎙️

Related FDE Interview Questions & Evaluation Expectations

Interactive Practice

Why should you never use the 'latest' image tag in Kubernetes production manifests?

Easy

What Interviewers Expect:

•The 'latest' tag makes deployments non-deterministic; nodes pulling at different times may run different image digests.

•Rollbacks become unpredictable because rolling back to 'latest' doesn't change the manifest.

•Security auditing and CVE vulnerability tracing cannot track which specific commit is running in cluster pods.

🎯 Launch AI Coach Mock Simulation on this Question→

Next Module: Observability: OpenTelemetry, Traces, Structured Logs & Incident Triage

Continue your progression in Track 4: Docker, Kubernetes, Cloud, Observability & Security.

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←Agentic Tool Calling, Guardrails & LLM Evaluation (Ragas)Track Overview Observability: OpenTelemetry, Traces, Structured Logs & Incident Triage→

# Stage 1: Build stage with dependencies and compilers FROM python:3.12-slim AS builder WORKDIR /app RUN apt-get update && apt-get install -y --no-install-recommends gcc build-essential COPY requirements.txt . RUN pip install --user --no-cache-dir -r requirements.txt # Stage 2: Hardened Runtime Container FROM python:3.12-slim AS runtime WORKDIR /app # Security: Create non-root user RUN groupadd -g 10001 appgroup && useradd -u 10001 -g appgroup appuser # Copy only compiled packages from builder COPY --from=builder /root/.local /home/appuser/.local COPY --chown=appuser:appgroup src/ ./src ENV PATH=/home/appuser/.local/bin:$PATH USER 10001:10001 EXPOSE 8080 HEALTHCHECK --interval=30s --timeout=3s --retries=3 CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8080/health')" CMD ["uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8080"]