Cloud & Container Security

shared responsibility · misconfigurations · container isolation · Kubernetes

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How cloud shared responsibility, IAM least privilege, secrets management, container isolation, image hardening, and Kubernetes network policies combine into a layered defense.

By the end, you can

Explain the shared responsibility model and identify which security items always belong to the customer.
Classify a given cloud setup by service model (IaaS/PaaS/SaaS) and state the customer's security obligations in each.
Name the four most common customer-side cloud misconfigurations and the control that mitigates each.
Trace the Capital One 2019 breach chain and identify where least-privilege IAM would have stopped it.
Distinguish container isolation from VM isolation and explain why a shared kernel widens the blast radius of a kernel exploit.
Identify the three Linux mechanisms (namespaces, cgroups, capabilities/seccomp) and state the isolation question each answers.
List the key practices in a hardened Dockerfile (minimal base, digest pin, non-root, CVE scanning).
Describe the Kubernetes default-deny NetworkPolicy pattern and explain why the default flat network is dangerous.
Explain why Kubernetes Secrets stored as base64 are not confidential and state two controls that actually protect them.
Apply the 4 C's model to evaluate the security of a cloud-native system layer by layer.

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