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Enforce Pod Security Standards by Configuring the Built-in Admission Controller
Kubernetes provides a built-in admission controller to enforce the Pod Security Standards. You can configure this admission controller to set cluster-wide defaults and exemptions.
Before you begin
Following an alpha release in Kubernetes v1.22, Pod Security Admission became available by default in Kubernetes v1.23, as a beta. From version 1.25 onwards, Pod Security Admission is generally available.
To check the version, enter kubectl version.
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Configure the Admission Controller
Note:
pod-security.admission.config.k8s.io/v1 configuration requires v1.25+.
For v1.23 and v1.24, use v1beta1.
For v1.22, use v1alpha1.apiVersion: apiserver.config.k8s.io/v1
kind: AdmissionConfiguration
plugins:
- name: PodSecurity
configuration:
apiVersion: pod-security.admission.config.k8s.io/v1 # see compatibility note
kind: PodSecurityConfiguration
# Defaults applied when a mode label is not set.
#
# Level label values must be one of:
# - "privileged" (default)
# - "baseline"
# - "restricted"
#
# Version label values must be one of:
# - "latest" (default)
# - specific version like "v1.30"
defaults:
enforce: "privileged"
enforce-version: "latest"
audit: "privileged"
audit-version: "latest"
warn: "privileged"
warn-version: "latest"
exemptions:
# Array of authenticated usernames to exempt.
usernames: []
# Array of runtime class names to exempt.
runtimeClasses: []
# Array of namespaces to exempt.
namespaces: []
Note:
The above manifest needs to be specified via the--admission-control-config-file to kube-apiserver.