Network Policies and Workload Security

What you will be able to do

• Distinguish policy target from ingress rule in a realistic network policies and workload security case.
• Interpret the operational evidence and boundary associated with egress rule.
• Choose an appropriate action involving default deny without exceeding the named workload scope.
• Verify pod security through an observable runtime result and reproducible handoff.

01

Frame Network Policies and Workload Security

Reduce workload attack paths with precise Pod selection, ingress and egress policy, default-deny posture, and Pod security controls verified by real traffic.

A payments API should accept requests only from its frontend, reach one database service, and reject unrelated namespace traffic and unsafe container settings.

Keep declared state, runtime state, observable evidence, access boundaries, and recovery outcomes separate. Begin with the smallest read-only inspection that identifies the exact image, container, Pod, controller, network, storage object, or policy in scope.

02

Policy target

A NetworkPolicy pod selector determines which Pods in its namespace the policy applies to. Within network policies and workload security, this role answers one specific container or orchestration question and keeps its own evidence.

Match the stable payments API labels exactly. Apply that action to the named workload before expanding scope, changing another resource, or discarding the current state.

Respect this boundary: do not assume a policy with an empty selector targets no pods. The observable result is specific: only intended payments api pods are selected.

03

Ingress rule

Ingress policy rules describe allowed inbound traffic for selected Pods. Within network policies and workload security, this role answers one specific container or orchestration question and keeps its own evidence.

Allow the frontend namespace and Pod labels on the API port. Apply that action to the named workload before expanding scope, changing another resource, or discarding the current state.

Respect this boundary: do not permit the whole cluster when one frontend identity is required. The observable result is specific: frontend requests reach the api and unrelated sources do not.

04

Egress rule

Egress policy rules describe allowed outbound traffic from selected Pods. Within network policies and workload security, this role answers one specific container or orchestration question and keeps its own evidence.

Allow required DNS and the database destination only. Apply that action to the named workload before expanding scope, changing another resource, or discarding the current state.

Respect this boundary: do not block dns accidentally while diagnosing database reachability. The observable result is specific: the api resolves names and reaches only its required database path.

05

Default deny

A default-deny policy establishes isolation so unmatched traffic remains blocked when the network plugin enforces policy. Within network policies and workload security, this role answers one specific container or orchestration question and keeps its own evidence.

Apply and test default-deny posture before adding narrow allows. Apply that action to the named workload before expanding scope, changing another resource, or discarding the current state.

Respect this boundary: do not assume policy works without a compatible network implementation. The observable result is specific: unapproved ingress and egress tests fail.

06

Pod security

Pod Security Standards define security profiles for workload configuration such as privilege and host access. Within network policies and workload security, this role answers one specific container or orchestration question and keeps its own evidence.

Validate the workload against the selected restricted or baseline policy. Apply that action to the named workload before expanding scope, changing another resource, or discarding the current state.

Respect this boundary: do not grant privileged settings to bypass file permission design. The observable result is specific: the payments pod is admitted with only approved security settings.

07

Apply Network Policies and Workload Security to One Workload

Use one bounded workload decision: A payments API should accept requests only from its frontend, reach one database service, and reject unrelated namespace traffic and unsafe container settings.

First, match the stable payments api labels exactly. Then, allow the frontend namespace and pod labels on the api port. Preserve both observations with the exact resource identity before changing runtime state.

Next, allow required dns and the database destination only. After that, apply and test default-deny posture before adding narrow allows. Close the task only after you validate the workload against the selected restricted or baseline policy.

08

Recap Before Practice and Prove

Policy target: A NetworkPolicy pod selector determines which Pods in its namespace the policy applies to. In this workload, match the stable payments api labels exactly. Preserve the boundary: do not assume a policy with an empty selector targets no pods.

Ingress rule: Ingress policy rules describe allowed inbound traffic for selected Pods. In this workload, allow the frontend namespace and pod labels on the api port. Preserve the boundary: do not permit the whole cluster when one frontend identity is required.

Egress rule: Egress policy rules describe allowed outbound traffic from selected Pods. In this workload, allow required dns and the database destination only. Preserve the boundary: do not block dns accidentally while diagnosing database reachability.

Default deny: A default-deny policy establishes isolation so unmatched traffic remains blocked when the network plugin enforces policy. In this workload, apply and test default-deny posture before adding narrow allows. Preserve the boundary: do not assume policy works without a compatible network implementation.

Pod security: Pod Security Standards define security profiles for workload configuration such as privilege and host access. In this workload, validate the workload against the selected restricted or baseline policy. Preserve the boundary: do not grant privileged settings to bypass file permission design.