{"id":2548,"date":"2026-02-21T06:24:32","date_gmt":"2026-02-21T06:24:32","guid":{"rendered":"https:\/\/devsecopsschool.com\/blog\/psp\/"},"modified":"2026-02-21T06:24:32","modified_gmt":"2026-02-21T06:24:32","slug":"psp","status":"publish","type":"post","link":"https:\/\/devsecopsschool.com\/blog\/psp\/","title":{"rendered":"What is PSP? Meaning, Architecture, Examples, Use Cases, and How to Measure It (2026 Guide)"},"content":{"rendered":"\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Quick Definition (30\u201360 words)<\/h2>\n\n\n\n<p>Pod Security Policy (PSP) is a Kubernetes admission control mechanism that enforced pod-level security constraints. Analogy: PSP is like airport security rules for containers. Formal: PSP defines allowed pod spec features and validates pods at admission time against policy objects.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">What is PSP?<\/h2>\n\n\n\n<p>What it is \/ what it is NOT<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PSP is a Kubernetes admission control resource model used to restrict pod capabilities, e.g., privileged mode, hostPath, running as root.<\/li>\n<li>PSP is NOT a runtime enforcement engine for already-running containers; it prevents creation rather than introspecting existing pods.<\/li>\n<li>PSP is NOT a replacement for broader cluster security like network policies, workload identity, or image scanning.<\/li>\n<\/ul>\n\n\n\n<p>Key properties and constraints<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Admission-time enforcement: evaluates pod requests before creation.<\/li>\n<li>Policy granularity: operates on pod spec fields and security context attributes.<\/li>\n<li>RBAC binding: policies are applied via role or clusterrole bindings to service accounts and users.<\/li>\n<li>Deprecated upstream: the built-in PSP API was deprecated and removed in recent Kubernetes versions; many clusters use PodSecurity admission or third-party controllers.<\/li>\n<li>Compatibility constraints: behavior varies by Kubernetes version and vendor managed control planes.<\/li>\n<\/ul>\n\n\n\n<p>Where it fits in modern cloud\/SRE workflows<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Preventive security gate in CI\/CD pipeline and admission control.<\/li>\n<li>Complement to runtime detection, image scanning, and network controls.<\/li>\n<li>Integrated into shift-left security: AC policies are tested in pre-prod to avoid CI failures.<\/li>\n<li>Used by platform teams to enforce organizational minimal privileges.<\/li>\n<\/ul>\n\n\n\n<p>A text-only \u201cdiagram description\u201d readers can visualize<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Developer -&gt; CI builds image -&gt; Developer submits deployment -&gt; API server admission chain: first webhook checks -&gt; PSP evaluates pod spec -&gt; If allowed, write to etcd -&gt; Scheduler places pod -&gt; Kubelet runs pod -&gt; Observability and runtime security tools monitor.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">PSP in one sentence<\/h3>\n\n\n\n<p>PSP is an admission-time policy model for validating Kubernetes pod specs to enforce security constraints before pods are created.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PSP vs related terms (TABLE REQUIRED)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>ID<\/th>\n<th>Term<\/th>\n<th>How it differs from PSP<\/th>\n<th>Common confusion<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T1<\/td>\n<td>PodSecurity admission<\/td>\n<td>New builtin policy enforcement model<\/td>\n<td>Often assumed identical to PSP<\/td>\n<\/tr>\n<tr>\n<td>T2<\/td>\n<td>Gatekeeper<\/td>\n<td>Policy engine using OPA not PSP<\/td>\n<td>People think Gatekeeper modifies PSP<\/td>\n<\/tr>\n<tr>\n<td>T3<\/td>\n<td>PodSecurityPolicy API<\/td>\n<td>The deprecated PSP API object<\/td>\n<td>Confused with current admission models<\/td>\n<\/tr>\n<tr>\n<td>T4<\/td>\n<td>NetworkPolicy<\/td>\n<td>Controls networking not pod security<\/td>\n<td>Some expect it blocks privileged containers<\/td>\n<\/tr>\n<tr>\n<td>T5<\/td>\n<td>Runtime security<\/td>\n<td>Detects behavior post-start<\/td>\n<td>Assumed to prevent pod creation like PSP<\/td>\n<\/tr>\n<tr>\n<td>T6<\/td>\n<td>Image scanning<\/td>\n<td>Examines images not pod specs<\/td>\n<td>Expected to block hostPath like PSP<\/td>\n<\/tr>\n<tr>\n<td>T7<\/td>\n<td>RBAC<\/td>\n<td>Authz for subjects not pod constraints<\/td>\n<td>Mistaken for policy application method<\/td>\n<\/tr>\n<tr>\n<td>T8<\/td>\n<td>Admission webhook<\/td>\n<td>Mechanism not policy model<\/td>\n<td>Believed to be a PSP replacement<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Row Details (only if any cell says \u201cSee details below\u201d)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>None<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Why does PSP matter?<\/h2>\n\n\n\n<p>Business impact (revenue, trust, risk)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prevents privilege escalation and data exfiltration risks that can lead to breaches and regulatory fines.<\/li>\n<li>Reduces blast radius from attacks, protecting customer trust and uptime.<\/li>\n<li>Enables consistent enforcement across teams, lowering compliance audit costs.<\/li>\n<\/ul>\n\n\n\n<p>Engineering impact (incident reduction, velocity)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduces production incidents due to insecure pod configurations.<\/li>\n<li>Improves developer velocity by preventing security rework earlier in the lifecycle.<\/li>\n<li>Lowers on-call load by removing a class of configuration-induced failures.<\/li>\n<\/ul>\n\n\n\n<p>SRE framing (SLIs\/SLOs\/error budgets\/toil\/on-call) where applicable<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SLIs: percent of pods compliant with baseline security policy; time-to-detect policy violations in CI.<\/li>\n<li>SLOs: maintain compliance SLO versus audit requirements, e.g., 99.9% of production pods compliant.<\/li>\n<li>Error budget: violations consume policy compliance budget; repeated violations trigger remediation.<\/li>\n<li>Toil: manual review of pod specs becomes toil; automation via admission reduces it.<\/li>\n<li>On-call: alerts for policy admission failures should be routed to platform or CI owners, not app on-call.<\/li>\n<\/ul>\n\n\n\n<p>3\u20135 realistic \u201cwhat breaks in production\u201d examples<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A deployment uses hostPath to mount host directories leading to data corruption across nodes.<\/li>\n<li>Containers run as root and write to node filesystems, enabling escape vectors.<\/li>\n<li>Privileged containers granted CAP_SYS_ADMIN break security assumptions in multi-tenant clusters.<\/li>\n<li>Use of hostNetwork unexpectedly exposes sensitive service endpoints to external traffic.<\/li>\n<li>Misconfigured seccomp\/profile absent causes noisy kernel logs and performance degradation.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Where is PSP used? (TABLE REQUIRED)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>ID<\/th>\n<th>Layer\/Area<\/th>\n<th>How PSP appears<\/th>\n<th>Typical telemetry<\/th>\n<th>Common tools<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>L1<\/td>\n<td>Edge \/ Ingress<\/td>\n<td>Prevents hostNetwork hostPort usage<\/td>\n<td>Admission deny logs<\/td>\n<td>Admission webhooks<\/td>\n<\/tr>\n<tr>\n<td>L2<\/td>\n<td>Node \/ Kubelet<\/td>\n<td>Disallow privileged pods<\/td>\n<td>Kube-apiserver audit<\/td>\n<td>kube-apiserver audit<\/td>\n<\/tr>\n<tr>\n<td>L3<\/td>\n<td>Service \/ App<\/td>\n<td>Block hostPath and runAsRoot<\/td>\n<td>Pod creation failures<\/td>\n<td>PodSecurity admission<\/td>\n<\/tr>\n<tr>\n<td>L4<\/td>\n<td>Data \/ Storage<\/td>\n<td>Restrict volume types<\/td>\n<td>PVC bind failures<\/td>\n<td>StorageClass policies<\/td>\n<\/tr>\n<tr>\n<td>L5<\/td>\n<td>Kubernetes control plane<\/td>\n<td>Enforce RBAC-bound policies<\/td>\n<td>Authz audit events<\/td>\n<td>OPA Gatekeeper<\/td>\n<\/tr>\n<tr>\n<td>L6<\/td>\n<td>Serverless \/ FaaS<\/td>\n<td>Limit container capabilities<\/td>\n<td>Platform invocation errors<\/td>\n<td>Platform admission hooks<\/td>\n<\/tr>\n<tr>\n<td>L7<\/td>\n<td>CI\/CD pipeline<\/td>\n<td>Pre-commit or admission testing<\/td>\n<td>CI job pass\/fail rates<\/td>\n<td>Policy-as-code in CI<\/td>\n<\/tr>\n<tr>\n<td>L8<\/td>\n<td>Observability \/ Security<\/td>\n<td>Feed to SIEM for compliance<\/td>\n<td>Alert counts and dashboards<\/td>\n<td>Falco, Kyverno<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Row Details (only if needed)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>None<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">When should you use PSP?<\/h2>\n\n\n\n<p>When it\u2019s necessary<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Multi-tenant clusters where isolation is required.<\/li>\n<li>Regulated environments with compliance requirements.<\/li>\n<li>Platform teams enforcing minimal privileges across teams.<\/li>\n<\/ul>\n\n\n\n<p>When it\u2019s optional<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Single-team clusters with trusted developers and tight review processes.<\/li>\n<li>Short-lived experimental clusters that are isolated and ephemeral.<\/li>\n<\/ul>\n\n\n\n<p>When NOT to use \/ overuse it<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avoid overly strict global policies that block legitimate Dev workflows.<\/li>\n<li>Don\u2019t use PSP as the only security control; combine with runtime and network controls.<\/li>\n<li>Avoid per-pod micromanagement that creates constant friction for developers.<\/li>\n<\/ul>\n\n\n\n<p>Decision checklist<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If multi-tenant AND compliance required -&gt; enforce baseline policies at admission.<\/li>\n<li>If single-team AND rapid experimentation -&gt; start with advisory policies in CI.<\/li>\n<li>If many legacy workloads break on first rollout -&gt; use graduated enforcement (audit -&gt; enforce).<\/li>\n<\/ul>\n\n\n\n<p>Maturity ladder: Beginner -&gt; Intermediate -&gt; Advanced<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Beginner: Add an admission gate that denies privileged and hostPath.<\/li>\n<li>Intermediate: Implement policy-as-code in CI and enforce minimal runAsUser and seccomp.<\/li>\n<li>Advanced: Combine PodSecurity, OPA\/Gatekeeper, runtime enforcement, and automated remediations.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">How does PSP work?<\/h2>\n\n\n\n<p>Explain step-by-step<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Policy authoring: Define constraints (e.g., allowPrivilegeEscalation: false).<\/li>\n<li>Policy binding: Bind policy to service accounts, groups or namespaces via RBAC.<\/li>\n<li>Admission-time evaluation: API server or admission controller evaluates pod spec against policies.<\/li>\n<li>Decision: Admit, deny, or mutate (depending on controller capability).<\/li>\n<li>Audit and reporting: Log admission decisions to kube-apiserver audit and SIEM.<\/li>\n<li>Remediation: CI tests or automated tools fix violations or notify owners.<\/li>\n<\/ul>\n\n\n\n<p>Components and workflow<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Policy storage: Policy objects stored in etcd or external Git (policy-as-code).<\/li>\n<li>Admission chain: kube-apiserver calls controllers\/webhooks in order.<\/li>\n<li>Matchers: Rules match namespaces, service accounts, labels.<\/li>\n<li>Action: deny, audit, or mutate pod specs.<\/li>\n<li>Observability: Audit logs, metrics, and dashboards feed SRE workflows.<\/li>\n<\/ul>\n\n\n\n<p>Data flow and lifecycle<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Developer pushes manifest -&gt; CI runs policy checks -&gt; Developer deploys -&gt; API server admission checks -&gt; Pod admitted\/denied -&gt; Runtime monitoring observes behavior.<\/li>\n<\/ul>\n\n\n\n<p>Edge cases and failure modes<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Admission webhook outage can block all pod creations if webhook is synchronous and misconfigured.<\/li>\n<li>Version skew: older PSP objects may not be honored in newer clusters.<\/li>\n<li>RBAC misconfiguration leads to over- or under-enforcement.<\/li>\n<li>Exceptions: Some system pods require elevated privileges; misclassifying them breaks control plane.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Typical architecture patterns for PSP<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Baseline enforcement pattern\n   &#8211; Use for: quick minimal security across all namespaces.\n   &#8211; Implementation: deny privileged, enforce non-root.<\/li>\n<li>Namespace-tiered pattern\n   &#8211; Use for: multi-tenant clusters with dev\/prod tiers.\n   &#8211; Implementation: different policies per namespace tier.<\/li>\n<li>GitOps policy-as-code pattern\n   &#8211; Use for: teams using GitOps and automated reviews.\n   &#8211; Implementation: policies stored in Git, validated by CI, applied via controllers.<\/li>\n<li>Advisory-to-enforce pattern\n   &#8211; Use for: migrations from permissive to strict enforcement.\n   &#8211; Implementation: audit first, then enforce after remediation windows.<\/li>\n<li>Mutating + validating pattern\n   &#8211; Use for: automatic hardening (e.g., adding seccomp profiles).\n   &#8211; Implementation: mutating webhook injects defaults, validating webhook enforces.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Failure modes &amp; mitigation (TABLE REQUIRED)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>ID<\/th>\n<th>Failure mode<\/th>\n<th>Symptom<\/th>\n<th>Likely cause<\/th>\n<th>Mitigation<\/th>\n<th>Observability signal<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>F1<\/td>\n<td>Webhook outage<\/td>\n<td>Pod creation blocked<\/td>\n<td>Synchronous webhook down<\/td>\n<td>Use timeout and fail-open audit<\/td>\n<td>Increased admission errors<\/td>\n<\/tr>\n<tr>\n<td>F2<\/td>\n<td>Overly strict policy<\/td>\n<td>Many deployment failures<\/td>\n<td>Broad deny rules<\/td>\n<td>Audit mode then incrementally enforce<\/td>\n<td>Spike in deny audit logs<\/td>\n<\/tr>\n<tr>\n<td>F3<\/td>\n<td>RBAC misbind<\/td>\n<td>Policy not applied<\/td>\n<td>Incorrect role binding<\/td>\n<td>Correct bindings and test in staging<\/td>\n<td>Discrepancy in expected vs actual denies<\/td>\n<\/tr>\n<tr>\n<td>F4<\/td>\n<td>Version incompatibility<\/td>\n<td>PSP ignored or errors<\/td>\n<td>Kubernetes API removal<\/td>\n<td>Migrate to PodSecurity or OPA<\/td>\n<td>API errors in controller logs<\/td>\n<\/tr>\n<tr>\n<td>F5<\/td>\n<td>Privileged system pods blocked<\/td>\n<td>Control plane degraded<\/td>\n<td>Policy applied to system ns<\/td>\n<td>Exclude system namespaces<\/td>\n<td>Control plane pod restarts<\/td>\n<\/tr>\n<tr>\n<td>F6<\/td>\n<td>Silent drift<\/td>\n<td>Policies diverge from Git<\/td>\n<td>Manual edits in-cluster<\/td>\n<td>Enforce GitOps reconciliation<\/td>\n<td>Config drift alerts<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Row Details (only if needed)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>None<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Key Concepts, Keywords &amp; Terminology for PSP<\/h2>\n\n\n\n<p>Glossary entries (40+ terms). Each entry: Term \u2014 1\u20132 line definition \u2014 why it matters \u2014 common pitfall<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>PodSecurityPolicy \u2014 Deprecated Kubernetes API for pod admission controls \u2014 Central historic model \u2014 Pitfall: removed in newer K8s.<\/li>\n<li>PodSecurity admission \u2014 Replacement builtin admission controller enforcing pod security standards \u2014 Important as current recommended model \u2014 Pitfall: behavior differs from PSP.<\/li>\n<li>Admission controller \u2014 Component that intercepts API requests \u2014 Core enforcement point \u2014 Pitfall: misconfigured webhook can block cluster.<\/li>\n<li>Admission webhook \u2014 External service called during admission \u2014 Enables custom policies \u2014 Pitfall: availability impacts pod creation.<\/li>\n<li>OPA Gatekeeper \u2014 Policy engine using Open Policy Agent \u2014 Flexible policy-as-code \u2014 Pitfall: complexity and performance considerations.<\/li>\n<li>Kyverno \u2014 Kubernetes native policy engine \u2014 Simpler policy syntax for K8s \u2014 Pitfall: version compatibility.<\/li>\n<li>RBAC \u2014 Role-based access control for subjects \u2014 Defines who can create pods \u2014 Pitfall: over-permissive roles.<\/li>\n<li>Namespace \u2014 K8s logical partition \u2014 Allows per-namespace policies \u2014 Pitfall: forgetting system namespaces.<\/li>\n<li>ServiceAccount \u2014 Identity for workloads \u2014 Bind policies to SA for least privilege \u2014 Pitfall: default SA surprises.<\/li>\n<li>seccomp \u2014 Kernel syscall filtering for containers \u2014 Reduces attack surface \u2014 Pitfall: missing profile causes permissive syscalls.<\/li>\n<li>runAsUser \u2014 Security context setting to avoid root \u2014 Prevents privilege escalation \u2014 Pitfall: legacy images require root.<\/li>\n<li>runAsNonRoot \u2014 Enforce non-root container processes \u2014 Simple safety check \u2014 Pitfall: false positives in init containers.<\/li>\n<li>allowPrivilegeEscalation \u2014 Controls setuid usage \u2014 Prevents kernel privilege escalation \u2014 Pitfall: needed for some debuggers.<\/li>\n<li>hostPath \u2014 Mount host filesystem into pod \u2014 Dangerous for isolation \u2014 Pitfall: used for convenience in prod.<\/li>\n<li>hostNetwork \u2014 Shares node network namespace \u2014 Exposes node ports \u2014 Pitfall: unexpected external exposure.<\/li>\n<li>hostPID \u2014 Shares node process namespace \u2014 Security risk for node introspection \u2014 Pitfall: needed by some debugging tools.<\/li>\n<li>capabilities \u2014 Linux capabilities granting fine-grained privileges \u2014 Controls powerful ops like NET_ADMIN \u2014 Pitfall: granting CAP_SYS_ADMIN is near-root.<\/li>\n<li>privileged container \u2014 Full host access like root \u2014 Highest risk \u2014 Pitfall: used for convenience in init workloads.<\/li>\n<li>SELinux \u2014 Mandatory access control for processes \u2014 Adds defense layer \u2014 Pitfall: complex labels and policy tuning.<\/li>\n<li>AppArmor \u2014 Kernel security module for confinement \u2014 Reduces program actions \u2014 Pitfall: profile maintenance overhead.<\/li>\n<li>Mutating webhook \u2014 Alters requests, e.g., inject seccomp \u2014 Used for auto-hardening \u2014 Pitfall: unexpected changes to manifests.<\/li>\n<li>Validating webhook \u2014 Accept\/deny admission requests \u2014 Enforces policies \u2014 Pitfall: blocks without clear remediation.<\/li>\n<li>GitOps \u2014 Policy-as-code workflows stored in Git \u2014 Enables reproducibility \u2014 Pitfall: delayed reconciliation can cause drift.<\/li>\n<li>Policy-as-code \u2014 Express policies in versioned code \u2014 Improves reviewability \u2014 Pitfall: overcomplex rules.<\/li>\n<li>Audit logs \u2014 Records of admission decisions \u2014 Required for compliance \u2014 Pitfall: noisy logs if policy too verbose.<\/li>\n<li>SIEM \u2014 Security information and event management \u2014 Centralizes alerts \u2014 Pitfall: high signal-to-noise if unfiltered.<\/li>\n<li>Least privilege \u2014 Principle to minimize permissions \u2014 Core security idea \u2014 Pitfall: too strict may break apps.<\/li>\n<li>Mutate-and-validate pattern \u2014 Inject defaults then enforce \u2014 Reduces friction \u2014 Pitfall: order of webhooks matters.<\/li>\n<li>Admission latency \u2014 Time added by webhooks \u2014 Affects deployment speed \u2014 Pitfall: slow webhooks slow CI.<\/li>\n<li>Fail-open vs fail-closed \u2014 Webhook failure behavior \u2014 Decides blocking behavior \u2014 Pitfall: fail-open may permit bad pods.<\/li>\n<li>PodSecurity standard levels \u2014 e.g., privileged, baseline, restricted \u2014 Defines graded constraints \u2014 Pitfall: mislabeling namespaces.<\/li>\n<li>Scanning vs enforcement \u2014 Image scanning looks at images, PSP checks pod specs \u2014 Complementary controls \u2014 Pitfall: relying on one alone.<\/li>\n<li>Runtime security (Falco) \u2014 Detects behavioral anomalies \u2014 Covers runtime gaps \u2014 Pitfall: alerts without context.<\/li>\n<li>Immutable infrastructure \u2014 Avoid manual in-cluster edits \u2014 Promotes reproducibility \u2014 Pitfall: manual fixes create drift.<\/li>\n<li>Canary policies \u2014 Gradual enforcement approach \u2014 Useful for migration \u2014 Pitfall: partial enforcement complexity.<\/li>\n<li>Policy templates \u2014 Reusable rule patterns \u2014 Aid consistency \u2014 Pitfall: hidden complexity in templates.<\/li>\n<li>Compliance baseline \u2014 Organization policy requirements \u2014 Guides PSP design \u2014 Pitfall: baselines too generic.<\/li>\n<li>Policy reconciliation \u2014 Ensure desired state applied \u2014 Keeps clusters consistent \u2014 Pitfall: reconciliation lag.<\/li>\n<li>Cluster-wide vs namespace policies \u2014 Different scope impacts \u2014 Pitfall: cluster policies can break system components.<\/li>\n<li>Emergency allowlist \u2014 Temporary exemptions for critical fixes \u2014 Operational necessity \u2014 Pitfall: abused and left in place.<\/li>\n<li>Capability bounding \u2014 Limit set of Linux capabilities \u2014 Prevent escalation \u2014 Pitfall: misidentifying required caps.<\/li>\n<li>Pod security context \u2014 Aggregated security settings per pod \u2014 Central to PSP checks \u2014 Pitfall: omissions cause denials.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Measure PSP (Metrics, SLIs, SLOs) (TABLE REQUIRED)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>ID<\/th>\n<th>Metric\/SLI<\/th>\n<th>What it tells you<\/th>\n<th>How to measure<\/th>\n<th>Starting target<\/th>\n<th>Gotchas<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M1<\/td>\n<td>Pod compliance rate<\/td>\n<td>Percent pods meeting policy<\/td>\n<td>Count compliant pods \/ total pods<\/td>\n<td>99% for prod<\/td>\n<td>Some system pods excluded<\/td>\n<\/tr>\n<tr>\n<td>M2<\/td>\n<td>Admission deny rate<\/td>\n<td>Fraction of admissions denied<\/td>\n<td>Deny events \/ total admissions<\/td>\n<td>&lt;1% after rollout<\/td>\n<td>Deny spikes indicate dev friction<\/td>\n<\/tr>\n<tr>\n<td>M3<\/td>\n<td>Time to remediate violation<\/td>\n<td>Time from deny to fix<\/td>\n<td>Time tracked in ticketing<\/td>\n<td>&lt;48 hours for prod<\/td>\n<td>Long lead due to cross-team handoffs<\/td>\n<\/tr>\n<tr>\n<td>M4<\/td>\n<td>Audit denial alerts<\/td>\n<td>Number of denied events alerting ops<\/td>\n<td>Count denies from audit logs<\/td>\n<td>Configurable threshold<\/td>\n<td>High noise if policy verbose<\/td>\n<\/tr>\n<tr>\n<td>M5<\/td>\n<td>Policy drift frequency<\/td>\n<td>Number of in-cluster edits not in Git<\/td>\n<td>Drift events per week<\/td>\n<td>0 for GitOps<\/td>\n<td>Requires detection tooling<\/td>\n<\/tr>\n<tr>\n<td>M6<\/td>\n<td>Admission latency<\/td>\n<td>Extra ms added by policy checks<\/td>\n<td>Median webhook latency<\/td>\n<td>&lt;200ms<\/td>\n<td>Long latencies slow CI<\/td>\n<\/tr>\n<tr>\n<td>M7<\/td>\n<td>Unauthorized privilege escalations<\/td>\n<td>Runtime detections post-admit<\/td>\n<td>Runtime alerts correlated to pod<\/td>\n<td>0 for prod<\/td>\n<td>Runtime tools needed<\/td>\n<\/tr>\n<tr>\n<td>M8<\/td>\n<td>Exceptions count<\/td>\n<td>Number of emergency allowlist uses<\/td>\n<td>Count per time window<\/td>\n<td>Low and audited<\/td>\n<td>Abuse of allowlist possible<\/td>\n<\/tr>\n<tr>\n<td>M9<\/td>\n<td>CI policy failure rate<\/td>\n<td>CI jobs failing policy checks<\/td>\n<td>Failures \/ CI policy jobs<\/td>\n<td>&lt;2% post stabilization<\/td>\n<td>Early migration may spike<\/td>\n<\/tr>\n<tr>\n<td>M10<\/td>\n<td>Coverage of namespaces<\/td>\n<td>Percent namespaces covered by PSP<\/td>\n<td>CoveredNamespaces \/ totalNamespaces<\/td>\n<td>100% for regulated clusters<\/td>\n<td>System namespaces may be exempt<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Row Details (only if needed)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>None<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best tools to measure PSP<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Tool \u2014 Prometheus + kube-state-metrics<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What it measures for PSP: Pod counts, admission events, webhook metrics.<\/li>\n<li>Best-fit environment: Kubernetes clusters with metrics stack.<\/li>\n<li>Setup outline:<\/li>\n<li>Deploy kube-state-metrics.<\/li>\n<li>Instrument admission controllers to expose metrics.<\/li>\n<li>Create Prometheus rules to compute compliance rates.<\/li>\n<li>Configure Alertmanager with alarms for deny spikes.<\/li>\n<li>Strengths:<\/li>\n<li>Flexible queries and alerting.<\/li>\n<li>Widely used in cloud-native stacks.<\/li>\n<li>Limitations:<\/li>\n<li>Requires metric exposition from webhooks.<\/li>\n<li>Not a SIEM replacement.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Tool \u2014 Fluentd \/ Fluent Bit + ELK<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What it measures for PSP: Collects audit logs and denial events.<\/li>\n<li>Best-fit environment: Clusters with centralized logging.<\/li>\n<li>Setup outline:<\/li>\n<li>Enable kube-apiserver audit logs.<\/li>\n<li>Forward logs to Elasticsearch.<\/li>\n<li>Create dashboards for deny events.<\/li>\n<li>Strengths:<\/li>\n<li>Rich search across logs.<\/li>\n<li>Good for compliance audits.<\/li>\n<li>Limitations:<\/li>\n<li>Storage costs for large logs.<\/li>\n<li>Requires field normalization.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Tool \u2014 OPA Gatekeeper<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What it measures for PSP: Policy violations and audit reports.<\/li>\n<li>Best-fit environment: Policy-as-code users.<\/li>\n<li>Setup outline:<\/li>\n<li>Install Gatekeeper &amp; ConstraintTemplates.<\/li>\n<li>Create Constraints for desired rules.<\/li>\n<li>Use audit mode and capture reports.<\/li>\n<li>Strengths:<\/li>\n<li>Expressive Rego policies.<\/li>\n<li>Audit capabilities.<\/li>\n<li>Limitations:<\/li>\n<li>Rego learning curve.<\/li>\n<li>Performance tuning may be needed.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Tool \u2014 Kyverno<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What it measures for PSP: Validation, mutation, and policy audit events.<\/li>\n<li>Best-fit environment: Kubernetes-native policy needs.<\/li>\n<li>Setup outline:<\/li>\n<li>Install Kyverno.<\/li>\n<li>Define policies in YAML.<\/li>\n<li>Use mutate to inject defaults and validate to enforce.<\/li>\n<li>Strengths:<\/li>\n<li>K8s-like policy syntax.<\/li>\n<li>Easier onboarding.<\/li>\n<li>Limitations:<\/li>\n<li>May lack some advanced Rego features.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Tool \u2014 Falco<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What it measures for PSP: Runtime violations that indicate admission gaps.<\/li>\n<li>Best-fit environment: Runtime security observability.<\/li>\n<li>Setup outline:<\/li>\n<li>Deploy Falco as DaemonSet.<\/li>\n<li>Configure rules for privilege escalation patterns.<\/li>\n<li>Forward alerts to SIEM\/Alertmanager.<\/li>\n<li>Strengths:<\/li>\n<li>Detects behavioral anomalies.<\/li>\n<li>Complements admission controls.<\/li>\n<li>Limitations:<\/li>\n<li>False positives if rules not tuned.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended dashboards &amp; alerts for PSP<\/h3>\n\n\n\n<p>Executive dashboard<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Panels:<\/li>\n<li>Pod compliance rate (trend).<\/li>\n<li>Number of denied admissions by namespace.<\/li>\n<li>Time-to-remediate median.<\/li>\n<li>Policy drift count.<\/li>\n<li>Why:<\/li>\n<li>Shows compliance health to leadership.<\/li>\n<\/ul>\n\n\n\n<p>On-call dashboard<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Panels:<\/li>\n<li>Recent admission denies with stacktrace.<\/li>\n<li>Admission webhook latency and error rate.<\/li>\n<li>Namespaces with repeated denies.<\/li>\n<li>Active exceptions\/allowlist entries.<\/li>\n<li>Why:<\/li>\n<li>Rapid triage during incidents and deployment failures.<\/li>\n<\/ul>\n\n\n\n<p>Debug dashboard<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Panels:<\/li>\n<li>Raw audit log stream filtered for policy events.<\/li>\n<li>Per-webhook latency and error logs.<\/li>\n<li>Pod spec differences between requested and mutated.<\/li>\n<li>Timeline of CI fail rate for policy checks.<\/li>\n<li>Why:<\/li>\n<li>Deep troubleshooting for policy failures.<\/li>\n<\/ul>\n\n\n\n<p>Alerting guidance<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What should page vs ticket:<\/li>\n<li>Page: Admission webhook down or high error rate impacting pod creation.<\/li>\n<li>Ticket: Individual deployment denies for developers.<\/li>\n<li>Burn-rate guidance:<\/li>\n<li>If deny rate consumes more than 25% of weekly change-related tolerance, trigger review.<\/li>\n<li>Noise reduction tactics:<\/li>\n<li>Deduplicate identical denies.<\/li>\n<li>Group alerts by namespace or service account.<\/li>\n<li>Suppress during maintenance windows and known rollouts.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Implementation Guide (Step-by-step)<\/h2>\n\n\n\n<p>1) Prerequisites\n   &#8211; Cluster admin privileges or platform team involvement.\n   &#8211; CI and GitOps pipelines in place.\n   &#8211; Observability stack capturing audit logs and metrics.<\/p>\n\n\n\n<p>2) Instrumentation plan\n   &#8211; Add metrics to admission controllers.\n   &#8211; Ensure audit logging is enabled on kube-apiserver.\n   &#8211; Plan policies in Git with review workflows.<\/p>\n\n\n\n<p>3) Data collection\n   &#8211; Forward audit logs to central logging.\n   &#8211; Export metrics to Prometheus.\n   &#8211; Store policy state in Git.<\/p>\n\n\n\n<p>4) SLO design\n   &#8211; Define SLOs for compliance rate and time-to-remediate.\n   &#8211; Map SLOs to services and namespaces.<\/p>\n\n\n\n<p>5) Dashboards\n   &#8211; Build executive, on-call, and debug dashboards.\n   &#8211; Provide drill-down links from exec panels to debug panels.<\/p>\n\n\n\n<p>6) Alerts &amp; routing\n   &#8211; Create alerts for webhook health and deny spikes.\n   &#8211; Route to platform on-call for blocking issues.\n   &#8211; Route policy violations to application owners via ticketing.<\/p>\n\n\n\n<p>7) Runbooks &amp; automation\n   &#8211; Create runbooks for webhook outages, policy denial investigations, and emergency allowlist processes.\n   &#8211; Automate remediation for common fixes (e.g., add runAsUser where safe).<\/p>\n\n\n\n<p>8) Validation (load\/chaos\/game days)\n   &#8211; Run load tests for admission latency impacts.\n   &#8211; Conduct chaos tests that simulate webhook failure.\n   &#8211; Run game days to validate incident response.<\/p>\n\n\n\n<p>9) Continuous improvement\n   &#8211; Weekly policy reviews.\n   &#8211; Quarterly audits and SLO reviews.\n   &#8211; Postmortem-driven policy adjustments.<\/p>\n\n\n\n<p>Pre-production checklist<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Policies authored and stored in Git.<\/li>\n<li>CI policy tests added to pipeline.<\/li>\n<li>Staging cluster mirrors production policy enforcement.<\/li>\n<li>Observability capturing admission and audit logs.<\/li>\n<li>Runbooks for expected failures.<\/li>\n<\/ul>\n\n\n\n<p>Production readiness checklist<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Canary rollout with audit-mode first.<\/li>\n<li>Metrics and alerts configured and tested.<\/li>\n<li>Emergency allowlist process documented and limited.<\/li>\n<li>Training for app teams on common fixes.<\/li>\n<\/ul>\n\n\n\n<p>Incident checklist specific to PSP<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Confirm scope: which namespaces and service accounts affected.<\/li>\n<li>Check webhook health and API server logs.<\/li>\n<li>Determine if deny is expected or due to policy drift.<\/li>\n<li>If webhook down, assess fail-open configuration and restore service.<\/li>\n<li>Apply temporary allowlist if safe and document.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Use Cases of PSP<\/h2>\n\n\n\n<p>Provide 8\u201312 use cases:<\/p>\n\n\n\n<p>1) Multi-tenant SaaS cluster\n&#8211; Context: Multiple customers share cluster.\n&#8211; Problem: Isolation breaches risk data leaks.\n&#8211; Why PSP helps: Enforce least privilege for tenants.\n&#8211; What to measure: Pod compliance rate, unauthorized privileges.\n&#8211; Typical tools: PodSecurity, Gatekeeper, Prometheus.<\/p>\n\n\n\n<p>2) Regulated environment (PCI\/ISO)\n&#8211; Context: Compliance auditing required.\n&#8211; Problem: Inconsistent security posture across teams.\n&#8211; Why PSP helps: Standardize enforcement and produce audit logs.\n&#8211; What to measure: Policy drift, compliance SLOs.\n&#8211; Typical tools: PodSecurity, audit logging, SIEM.<\/p>\n\n\n\n<p>3) Platform-as-a-Service team\n&#8211; Context: Platform team provides managed namespaces.\n&#8211; Problem: Developers bypassing guidelines.\n&#8211; Why PSP helps: Prevent risky pods before they run.\n&#8211; What to measure: CI policy failure rates.\n&#8211; Typical tools: Kyverno, GitOps.<\/p>\n\n\n\n<p>4) CI\/CD hardening\n&#8211; Context: Deployments automated via pipelines.\n&#8211; Problem: Broken deployments due to runtime privilege assumptions.\n&#8211; Why PSP helps: Fail early in CI to avoid prod incidents.\n&#8211; What to measure: CI policy failures, remediation time.\n&#8211; Typical tools: Policy-as-code, CI plugins.<\/p>\n\n\n\n<p>5) Securing edge workloads\n&#8211; Context: Edge nodes run untrusted workloads.\n&#8211; Problem: Attack on edge node affects fleet.\n&#8211; Why PSP helps: Block hostNetwork and hostPath on edge pods.\n&#8211; What to measure: HostPath denies, hostNetwork usage.\n&#8211; Typical tools: PodSecurity admission, Falco.<\/p>\n\n\n\n<p>6) Legacy migration\n&#8211; Context: Moving older workloads to K8s.\n&#8211; Problem: Many containers require root.\n&#8211; Why PSP helps: Gradual enforcement to modernize apps.\n&#8211; What to measure: Number of exemptions and trend.\n&#8211; Typical tools: Audit-mode policies, canary enforcement.<\/p>\n\n\n\n<p>7) Serverless platform constraints\n&#8211; Context: Managed FaaS on K8s underneath.\n&#8211; Problem: Function runtimes gaining unintended capabilities.\n&#8211; Why PSP helps: Enforce minimal syscall surfaces.\n&#8211; What to measure: Runtime detections and denials.\n&#8211; Typical tools: Kyverno, seccomp profiles.<\/p>\n\n\n\n<p>8) Incident containment automation\n&#8211; Context: Post-breach containment required.\n&#8211; Problem: Need to quickly limit new risky pods.\n&#8211; Why PSP helps: Quickly apply stricter policies cluster-wide.\n&#8211; What to measure: Time to apply emergency policy, deny rate.\n&#8211; Typical tools: GitOps for fast policy deployment.<\/p>\n\n\n\n<p>9) Cost control (indirect)\n&#8211; Context: Privileged pods accessing node-level resources.\n&#8211; Problem: Unintended resource reserves and scheduling inefficiencies.\n&#8211; Why PSP helps: Prevent hostResource claims that remove capacity.\n&#8211; What to measure: Host-bound deployments and node utilization.\n&#8211; Typical tools: Admission policies and scheduler metrics.<\/p>\n\n\n\n<p>10) Platform onboarding\n&#8211; Context: New team joining shared cluster.\n&#8211; Problem: Lack of standardized practices increases risk.\n&#8211; Why PSP helps: Provide baseline constraints and onboarding templates.\n&#8211; What to measure: First-week compliance rate and ROX.\n&#8211; Typical tools: Templates in Git, CI tests.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Scenario Examples (Realistic, End-to-End)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario #1 \u2014 Kubernetes: Multi-tenant baseline enforcement<\/h3>\n\n\n\n<p><strong>Context:<\/strong> A SaaS provider runs multiple customer namespaces in one cluster.<br\/>\n<strong>Goal:<\/strong> Enforce baseline security without breaking existing workloads.<br\/>\n<strong>Why PSP matters here:<\/strong> Prevents privilege escalation and protects shared nodes.<br\/>\n<strong>Architecture \/ workflow:<\/strong> GitOps for policy definitions, Kyverno for mutation\/validation, Prometheus for metrics, Fluentd for audits.<br\/>\n<strong>Step-by-step implementation:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Inventory current pod specs in prod.<\/li>\n<li>Create baseline policies denying privileged, hostPath, hostNetwork.<\/li>\n<li>Deploy policies in audit mode for 2 weeks.<\/li>\n<li>Fix violations and provide developer guidance.<\/li>\n<li>Switch to enforce mode for non-system namespaces.\n<strong>What to measure:<\/strong> Pod compliance rate, deny events per namespace, time-to-remediate.<br\/>\n<strong>Tools to use and why:<\/strong> Kyverno for easy K8s-style policies; Prometheus for metrics; Fluentd for audit logs.<br\/>\n<strong>Common pitfalls:<\/strong> Not exempting kube-system causing control plane failures.<br\/>\n<strong>Validation:<\/strong> Run canary deployments with known-good manifests.<br\/>\n<strong>Outcome:<\/strong> Baseline enforced with minimal disruptions and measurable compliance.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario #2 \u2014 Serverless \/ Managed-PaaS: Function sandboxing<\/h3>\n\n\n\n<p><strong>Context:<\/strong> A company operates an internal FaaS platform on K8s.<br\/>\n<strong>Goal:<\/strong> Ensure functions cannot use host resources or escalate privileges.<br\/>\n<strong>Why PSP matters here:<\/strong> Functions are highly dynamic and riskier if permissive.<br\/>\n<strong>Architecture \/ workflow:<\/strong> Platform admission webhooks that mutate function pods to include seccomp and drop capabilities; Gatekeeper validates.<br\/>\n<strong>Step-by-step implementation:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Define seccomp and capability baselines.<\/li>\n<li>Mutating webhook injects defaults into function pods.<\/li>\n<li>Gatekeeper validates no hostPath or privileged flags.<\/li>\n<li>CI validates functions against policies before deployment.\n<strong>What to measure:<\/strong> Function pod compliance and runtime detections.<br\/>\n<strong>Tools to use and why:<\/strong> Mutating webhook for injection, Gatekeeper for validation, Falco for runtime.<br\/>\n<strong>Common pitfalls:<\/strong> Breakage of native libs requiring specific capabilities.<br\/>\n<strong>Validation:<\/strong> Canary with synthetic functions and runtime checks.<br\/>\n<strong>Outcome:<\/strong> Functions run in tighter sandboxes with reduced blast radius.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario #3 \u2014 Incident response \/ Postmortem: Privilege exploit mitigation<\/h3>\n\n\n\n<p><strong>Context:<\/strong> A container escape vulnerability exploited by an attacker to read node files.<br\/>\n<strong>Goal:<\/strong> Contain ongoing exploitation and prevent new risky pods.<br\/>\n<strong>Why PSP matters here:<\/strong> Quickly restrict new pods from using hostPath or privileged modes.<br\/>\n<strong>Architecture \/ workflow:<\/strong> Emergency policy pushed via GitOps; admission validates new pods; Falco watches for post-admit anomalies.<br\/>\n<strong>Step-by-step implementation:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Declare incident and notify platform on-call.<\/li>\n<li>Apply emergency deny policy cluster-wide excluding kube-system.<\/li>\n<li>Monitor for new deny events and retroactive runtime alerts.<\/li>\n<li>Remediate running risky pods via orchestration.<\/li>\n<li>Postmortem to remove allowlists and refine policies.\n<strong>What to measure:<\/strong> Time to apply emergency policy and reduction in risky pods.<br\/>\n<strong>Tools to use and why:<\/strong> GitOps for quick policy rollouts, Falco for runtime monitoring.<br\/>\n<strong>Common pitfalls:<\/strong> Overly broad emergency rules breaking legitimate jobs.<br\/>\n<strong>Validation:<\/strong> Confirm new pods are denied and runtime anomalies decline.<br\/>\n<strong>Outcome:<\/strong> Containment of the exploit vector while follow-up patches are deployed.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario #4 \u2014 Cost \/ Performance trade-off: Limiting node-affinity privileged workloads<\/h3>\n\n\n\n<p><strong>Context:<\/strong> Privileged workloads were allowed to reserve host devices causing scheduling hotspots.<br\/>\n<strong>Goal:<\/strong> Reduce node contention and improve cost efficiency.<br\/>\n<strong>Why PSP matters here:<\/strong> Prevents pods from requesting host resources unnecessarily.<br\/>\n<strong>Architecture \/ workflow:<\/strong> Enforcement via policy to forbid hostPath and hostNetwork for non-admin namespaces; scheduler metrics track node load.<br\/>\n<strong>Step-by-step implementation:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Identify pods using hostPath\/hostNetwork.<\/li>\n<li>Create policy disallowing host bindings in app namespaces.<\/li>\n<li>Educate teams on alternatives (CSI drivers, local PVs with eviction).<\/li>\n<li>Enforce policy and monitor node utilization and costs.\n<strong>What to measure:<\/strong> Host-bound pod count, node utilization, cost per workload.<br\/>\n<strong>Tools to use and why:<\/strong> Prometheus for node metrics, Gatekeeper for enforcement.<br\/>\n<strong>Common pitfalls:<\/strong> Legacy storage needs needing migration effort.<br\/>\n<strong>Validation:<\/strong> Observe reduced node saturation and lower costs.<br\/>\n<strong>Outcome:<\/strong> Improved packing and cost reduction while maintaining app functionality.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Common Mistakes, Anti-patterns, and Troubleshooting<\/h2>\n\n\n\n<p>List of mistakes with Symptom -&gt; Root cause -&gt; Fix (15\u201325 items)<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Symptom: Many deployments suddenly fail. -&gt; Root cause: Enforced policy applied cluster-wide without audit stage. -&gt; Fix: Roll back to audit mode and stage enforcement.<\/li>\n<li>Symptom: Control plane pods restart. -&gt; Root cause: Policy applied to kube-system namespaces. -&gt; Fix: Exempt kube-system or bind policy selectively.<\/li>\n<li>Symptom: CI pipeline fails for legacy apps. -&gt; Root cause: No migration path or advisory checks. -&gt; Fix: Add migration tasks and config transforms in CI.<\/li>\n<li>Symptom: Webhook timeout blocking deploys. -&gt; Root cause: Synchronous webhook slow response. -&gt; Fix: Increase timeouts, optimize webhook, use caching, fail-open if acceptable.<\/li>\n<li>Symptom: High alert noise for denies. -&gt; Root cause: Broad deny rules catching benign patterns. -&gt; Fix: Tweak rules, add exceptions, group alerts.<\/li>\n<li>Symptom: Runtime escape detected after admission. -&gt; Root cause: Admission misses runtime behavior. -&gt; Fix: Add runtime security tools like Falco and correlate events.<\/li>\n<li>Symptom: Policy drift between Git and cluster. -&gt; Root cause: Manual in-cluster edits. -&gt; Fix: Enforce GitOps reconciliation and audit.<\/li>\n<li>Symptom: Developers request privileges frequently. -&gt; Root cause: Missing capabilities\/incompatible images. -&gt; Fix: Provide developer guidance, alternative images, or safe allowlists.<\/li>\n<li>Symptom: Slow troubleshooting for denied pods. -&gt; Root cause: Poor audit log indexing. -&gt; Fix: Improve logging pipeline and searchable fields.<\/li>\n<li>Symptom: Too many exceptions. -&gt; Root cause: Emergency allowlist overused. -&gt; Fix: Time-bound allowlists and post-incident review.<\/li>\n<li>Symptom: False positives in runtime alerts. -&gt; Root cause: Un-tuned rules. -&gt; Fix: Tune Falco\/IDS rules for environment.<\/li>\n<li>Symptom: Admission controller memory pressure. -&gt; Root cause: Complex policy evaluation. -&gt; Fix: Simplify policies or scale controller replicas.<\/li>\n<li>Symptom: Unauthorized privilege escapes not detected. -&gt; Root cause: No runtime coverage. -&gt; Fix: Deploy additional runtime sensors and process baselines.<\/li>\n<li>Symptom: Policy regressions after upgrade. -&gt; Root cause: API behavior changes across K8s versions. -&gt; Fix: Test policies during cluster upgrades in staging.<\/li>\n<li>Symptom: Too many one-off policies. -&gt; Root cause: Lack of reuse and templates. -&gt; Fix: Create reusable policy templates.<\/li>\n<li>Symptom: Missing seccomp profiles. -&gt; Root cause: OS\/container runtime mismatch. -&gt; Fix: Standardize runtimes and maintain profiles.<\/li>\n<li>Symptom: App failures masked by admission denies. -&gt; Root cause: Poor error messaging in deny responses. -&gt; Fix: Provide detailed deny messages and remediation steps.<\/li>\n<li>Symptom: Observability blind spots. -&gt; Root cause: Not collecting admission metrics. -&gt; Fix: Instrument webhooks and export metrics.<\/li>\n<li>Symptom: Performance regressions with mutation. -&gt; Root cause: Mutating webhook injects heavy sidecars. -&gt; Fix: Re-evaluate injected artifacts and tune.<\/li>\n<li>Symptom: Security policy conflicts. -&gt; Root cause: Multiple policy engines with overlapping rules. -&gt; Fix: Consolidate or document precedence.<\/li>\n<li>Symptom: Unmonitored allowlist usage. -&gt; Root cause: Lack of audit for exemptions. -&gt; Fix: Log and review all allowlist entries periodically.<\/li>\n<li>Symptom: Poor developer adoption. -&gt; Root cause: No training and unclear guidance. -&gt; Fix: Provide examples, templates, and office hours.<\/li>\n<li>Symptom: Excessive manual remediation work. -&gt; Root cause: No automation for common fixes. -&gt; Fix: Create automation playbooks and PR bots.<\/li>\n<\/ol>\n\n\n\n<p>Observability pitfalls (at least 5 included above): noisy logs, missing metrics, indexing gaps, false positives, lack of correlation between admission and runtime.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Best Practices &amp; Operating Model<\/h2>\n\n\n\n<p>Ownership and on-call<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Platform team owns policy lifecycle and on-call for blocking webhook failures.<\/li>\n<li>Application teams own remediation for their violations.<\/li>\n<li>Create a clear escalation path when enforcement blocks critical business workflows.<\/li>\n<\/ul>\n\n\n\n<p>Runbooks vs playbooks<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Runbooks: Step-by-step operational procedures for common issues (webhook down, emergency allowlist).<\/li>\n<li>Playbooks: Higher-level decision guides for incidents requiring judgment (policy rollback vs enforce).<\/li>\n<\/ul>\n\n\n\n<p>Safe deployments (canary\/rollback)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Start in audit mode, then small-namespace canary, then full enforce.<\/li>\n<li>Keep quick rollback paths and automated tests in CI to detect breakages.<\/li>\n<\/ul>\n\n\n\n<p>Toil reduction and automation<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automate remediation PRs for simple fixes (e.g., inject runAsUser).<\/li>\n<li>Use policy templates and GitOps to avoid manual edits.<\/li>\n<\/ul>\n\n\n\n<p>Security basics<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Default deny for capabilities and privileged flags.<\/li>\n<li>Enforce non-root where possible.<\/li>\n<li>Apply seccomp and AppArmor profiles.<\/li>\n<li>Monitor runtime for deviations.<\/li>\n<\/ul>\n\n\n\n<p>Weekly\/monthly routines<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Weekly: Review deny spikes and open remediation tickets.<\/li>\n<li>Monthly: Audit allowlist entries and drift reports.<\/li>\n<li>Quarterly: SLO review and policy effectiveness report.<\/li>\n<\/ul>\n\n\n\n<p>What to review in postmortems related to PSP<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Whether policy prevented or caused the incident.<\/li>\n<li>Time to detect and remediate policy violations.<\/li>\n<li>Any changes to allowlists and their justification.<\/li>\n<li>Lessons to tighten or relax policies.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Tooling &amp; Integration Map for PSP (TABLE REQUIRED)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>ID<\/th>\n<th>Category<\/th>\n<th>What it does<\/th>\n<th>Key integrations<\/th>\n<th>Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>I1<\/td>\n<td>Policy engine<\/td>\n<td>Validates and mutates pod specs<\/td>\n<td>Kubernetes admission, GitOps<\/td>\n<td>Gatekeeper and Kyverno common choices<\/td>\n<\/tr>\n<tr>\n<td>I2<\/td>\n<td>Audit logging<\/td>\n<td>Collects admission decisions<\/td>\n<td>SIEM, ELK, cloud logging<\/td>\n<td>kube-apiserver audit must be enabled<\/td>\n<\/tr>\n<tr>\n<td>I3<\/td>\n<td>Metrics store<\/td>\n<td>Stores compliance and latency metrics<\/td>\n<td>Prometheus, Alertmanager<\/td>\n<td>Needs metrics from controllers<\/td>\n<\/tr>\n<tr>\n<td>I4<\/td>\n<td>Runtime security<\/td>\n<td>Detects runtime anomalies<\/td>\n<td>Falco, runtime scanners<\/td>\n<td>Complements admission controls<\/td>\n<\/tr>\n<tr>\n<td>I5<\/td>\n<td>GitOps<\/td>\n<td>Manages policy-as-code<\/td>\n<td>ArgoCD, Flux<\/td>\n<td>Ensures reconciliation<\/td>\n<\/tr>\n<tr>\n<td>I6<\/td>\n<td>CI integration<\/td>\n<td>Runs policy checks pre-deploy<\/td>\n<td>Jenkins, GitHub Actions<\/td>\n<td>Prevents violations before admission<\/td>\n<\/tr>\n<tr>\n<td>I7<\/td>\n<td>Dashboarding<\/td>\n<td>Visualizes compliance<\/td>\n<td>Grafana, Kibana<\/td>\n<td>Executive and debug views<\/td>\n<\/tr>\n<tr>\n<td>I8<\/td>\n<td>Identity \/ AuthN<\/td>\n<td>Maps service accounts and users<\/td>\n<td>OIDC, IAM<\/td>\n<td>Critical for correct policy binding<\/td>\n<\/tr>\n<tr>\n<td>I9<\/td>\n<td>Secrets &amp; config<\/td>\n<td>Securely store seccomp\/AppArmor files<\/td>\n<td>Vault, K8s Secrets<\/td>\n<td>Sensitive artifacts storage<\/td>\n<\/tr>\n<tr>\n<td>I10<\/td>\n<td>Incident mgmt<\/td>\n<td>Routes alerts and tickets<\/td>\n<td>PagerDuty, Opsgenie<\/td>\n<td>On-call routing for platform team<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Row Details (only if needed)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>None<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions (FAQs)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">H3: What does PSP stand for in Kubernetes?<\/h3>\n\n\n\n<p>Pod Security Policy in historical Kubernetes context; replaced by PodSecurity and third-party engines in newer K8s.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Is PSP still supported in Kubernetes 1.27+?<\/h3>\n\n\n\n<p>No, the built-in PSP API was deprecated earlier and removed in later releases. Use PodSecurity, OPA Gatekeeper, or Kyverno.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: What&#8217;s the difference between PodSecurity and PSP?<\/h3>\n\n\n\n<p>PodSecurity is the newer builtin admission mode with standard levels; PSP was a more flexible but deprecated API.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Can PSP mutate pod specs?<\/h3>\n\n\n\n<p>The original PSP was validating-only; mutation requires mutating webhooks like Kyverno or custom controllers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Should I use Gatekeeper or Kyverno?<\/h3>\n\n\n\n<p>Depends on team skills: Gatekeeper is powerful with Rego, Kyverno is Kubernetes-native and simpler for many use cases.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: How do I migrate from PSP to PodSecurity?<\/h3>\n\n\n\n<p>Inventory PSP usage, map rules to PodSecurity levels or Gatekeeper constraints, test in staging, and roll out audit-first.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: What are common PSP-equivalent policy rules?<\/h3>\n\n\n\n<p>Disallow privileged, disallow hostPath, enforce runAsNonRoot, require seccomp\/AppArmor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: How do I test policies without breaking prod?<\/h3>\n\n\n\n<p>Use audit mode and CI policy checks, and deploy to staging mirroring prod.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Who should own PSP policies?<\/h3>\n\n\n\n<p>Platform or security team owns policies; application teams own remediation and exceptions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: How do I measure the impact of PSP?<\/h3>\n\n\n\n<p>Track compliance rate, deny rate, remediation time, and runtime anomalies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: What happens if admission webhook fails?<\/h3>\n\n\n\n<p>If configured fail-closed it will block creations; fail-open allows through. Choose based on risk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Are PSPs enough for security?<\/h3>\n\n\n\n<p>No, they are preventive controls; combine with image scanning, network policy, and runtime security.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: How to handle legacy workloads requiring root?<\/h3>\n\n\n\n<p>Provide an exemption path with strict auditing and time-bound allowlists while modernizing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Can I auto-remediate policy violations?<\/h3>\n\n\n\n<p>Yes, for safe deterministic changes like injecting non-root users, but vet consequences.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: How to avoid noisy deny alerts?<\/h3>\n\n\n\n<p>Tune policies, aggregate alerts, use grouping and suppression windows.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: What telemetry is most valuable for PSP?<\/h3>\n\n\n\n<p>Admission deny events, webhook latencies, policy drift, and runtime detections.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: How to handle cross-cluster policies?<\/h3>\n\n\n\n<p>Use GitOps and central policy templates with per-cluster overrides.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H3: Do managed Kubernetes providers enforce PSP?<\/h3>\n\n\n\n<p>Varies \/ depends.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>PSP historically provided pod-level admission controls in Kubernetes and remains a core concept for enforcing pod security. By 2026, upstream PSP is deprecated, but the principles persist via PodSecurity, OPA Gatekeeper, Kyverno, mutating\/admission webhooks, and runtime tools. A robust approach combines preventive admission checks, policy-as-code in GitOps, runtime detection, and clear SRE ownership and observability.<\/p>\n\n\n\n<p>Next 7 days plan (5 bullets)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Day 1: Inventory current pod specs and identify risky pod attributes.<\/li>\n<li>Day 2: Enable kube-apiserver audit logging and forward to central logs.<\/li>\n<li>Day 3: Create baseline policies in Git in audit mode.<\/li>\n<li>Day 4: Add CI checks to run policy validations for merge requests.<\/li>\n<li>Day 5: Build Prometheus\/Grafana panels for basic compliance metrics.<\/li>\n<li>Day 6: Run a small canary enforcement in a non-critical namespace.<\/li>\n<li>Day 7: Review results, open remediation tickets, and plan next-week enforcement.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Appendix \u2014 PSP Keyword Cluster (SEO)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Primary keywords<\/li>\n<li>Pod Security Policy<\/li>\n<li>PSP Kubernetes<\/li>\n<li>PodSecurity admission<\/li>\n<li>Kubernetes pod security<\/li>\n<li>\n<p>Pod security best practices<\/p>\n<\/li>\n<li>\n<p>Secondary keywords<\/p>\n<\/li>\n<li>Kubernetes admission controllers<\/li>\n<li>PodSecurityPolicy deprecation<\/li>\n<li>OPA Gatekeeper policies<\/li>\n<li>Kyverno pod policies<\/li>\n<li>seccomp profiles Kubernetes<\/li>\n<li>AppArmor Kubernetes<\/li>\n<li>runAsNonRoot enforcement<\/li>\n<li>\n<p>hostPath policy Kubernetes<\/p>\n<\/li>\n<li>\n<p>Long-tail questions<\/p>\n<\/li>\n<li>How to migrate from PSP to PodSecurity<\/li>\n<li>What replaces PodSecurityPolicy in Kubernetes<\/li>\n<li>How to enforce non-root containers in Kubernetes<\/li>\n<li>How to audit PSP in Kubernetes clusters<\/li>\n<li>How to prevent privileged containers in K8s<\/li>\n<li>How to measure pod security compliance<\/li>\n<li>How to design pod admission policies<\/li>\n<li>How to use Gatekeeper for pod validation<\/li>\n<li>How to use Kyverno to mutate pod specs<\/li>\n<li>How to integrate pod security with CI\/CD<\/li>\n<li>What is the impact of admission webhook latency<\/li>\n<li>How to handle legacy apps with PSP rules<\/li>\n<li>How to author seccomp profiles for pods<\/li>\n<li>How to monitor admission deny rates<\/li>\n<li>\n<p>How to create policy-as-code for Kubernetes<\/p>\n<\/li>\n<li>\n<p>Related terminology<\/p>\n<\/li>\n<li>Admission webhook<\/li>\n<li>Mutating webhook<\/li>\n<li>Validating webhook<\/li>\n<li>Audit logs<\/li>\n<li>Policy-as-code<\/li>\n<li>GitOps policy management<\/li>\n<li>Runtime security<\/li>\n<li>Falco rules<\/li>\n<li>kube-apiserver audit<\/li>\n<li>Prometheus metrics for admission<\/li>\n<li>Alertmanager deny alerts<\/li>\n<li>Emergency allowlist<\/li>\n<li>Policy drift<\/li>\n<li>Compliance baseline<\/li>\n<li>Cluster role binding<\/li>\n<li>ServiceAccount policies<\/li>\n<li>Canary policy rollout<\/li>\n<li>Fail-open webhook<\/li>\n<li>Fail-closed webhook<\/li>\n<li>Policy reconciliation<\/li>\n<li>Seccomp profile injection<\/li>\n<li>AppArmor profile injection<\/li>\n<li>Capability bounding<\/li>\n<li>Least privilege enforcement<\/li>\n<li>Pod security context<\/li>\n<li>Node hostPath restrictions<\/li>\n<li>HostNetwork prevention<\/li>\n<li>Privileged container prevention<\/li>\n<li>Mutate-and-validate pattern<\/li>\n<li>Admission latency monitoring<\/li>\n<li>Policy audit reports<\/li>\n<li>SIEM integration for denies<\/li>\n<li>Kube-state-metrics compliance<\/li>\n<li>Kubernetes policy templates<\/li>\n<li>Policy testing in CI<\/li>\n<li>Postmortem policy review<\/li>\n<li>Emergency policy rollout<\/li>\n<li>Policy exclusion lists<\/li>\n<li>Policy coverage by namespace<\/li>\n<li>Policy SLOs and SLIs<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>&#8212;<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2548","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is PSP? 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