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71 lines
2.1 KiB
Markdown
71 lines
2.1 KiB
Markdown
# Disallow use of default namespace
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Kubernetes namespaces are an optional feature that provide a way to segment and isolate cluster resources across multiple applications and users. As a best practice, workloads should be isolated with namespaces. Namespaces should be required and the default (empty) namespace should not be used.
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## Policy YAML
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[disallow_default_namespace.yaml](best_practices/disallow_default_namespace.yaml)
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````yaml
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apiVersion: kyverno.io/v1
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kind: ClusterPolicy
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metadata:
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name: disallow-default-namespace
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annotations:
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pod-policies.kyverno.io/autogen-controllers: none
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policies.kyverno.io/category: Workload Isolation
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policies.kyverno.io/description: Kubernetes namespaces are an optional feature
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that provide a way to segment and isolate cluster resources across multiple
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applications and users. As a best practice, workloads should be isolated with
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namespaces. Namespaces should be required and the default (empty) namespace
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should not be used.
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spec:
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validationFailureAction: audit
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rules:
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- name: validate-namespace
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match:
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resources:
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kinds:
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- Pod
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validate:
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message: "Using 'default' namespace is not allowed"
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pattern:
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metadata:
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namespace: "!default"
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- name: require-namespace
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match:
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resources:
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kinds:
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- Pod
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validate:
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message: "A namespace is required"
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pattern:
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metadata:
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namespace: "?*"
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- name: validate-podcontroller-namespace
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match:
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resources:
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kinds:
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- DaemonSet
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- Deployment
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- Job
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- StatefulSet
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validate:
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message: "Using 'default' namespace is not allowed for podcontrollers"
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pattern:
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metadata:
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namespace: "!default"
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- name: require-podcontroller-namespace
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match:
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resources:
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kinds:
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- DaemonSet
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- Deployment
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- Job
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- StatefulSet
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validate:
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message: "A namespace is required for podcontrollers"
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pattern:
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metadata:
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namespace: "?*"
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````
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