Add Istio Sidecar Injection

In order for Istio to inject sidecars to workloads deployed into Namespaces, the label `istio-injection` must be set to `enabled`. As an alternative to rejecting Namespace definitions which don't already contain this label, it can be added automatically. This policy adds the label `istio-inject` set to `enabled` for all new Namespaces.

Policy Definition

/istio/add-sidecar-injection-namespace/add-sidecar-injection-namespace.yaml

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: add-sidecar-injection-namespace
 5  annotations:
 6    policies.kyverno.io/title: Add Istio Sidecar Injection
 7    policies.kyverno.io/category: Istio
 8    policies.kyverno.io/severity: medium
 9    kyverno.io/kyverno-version: 1.8.0
10    policies.kyverno.io/minversion: 1.6.0
11    kyverno.io/kubernetes-version: "1.24"
12    policies.kyverno.io/subject: Namespace
13    policies.kyverno.io/description: >-
14      In order for Istio to inject sidecars to workloads deployed into Namespaces, the label
15      `istio-injection` must be set to `enabled`. As an alternative to rejecting Namespace definitions
16      which don't already contain this label, it can be added automatically. This policy adds the label
17      `istio-inject` set to `enabled` for all new Namespaces.
18spec:
19  rules:
20  - name: add-istio-injection-enabled
21    match:
22      any:
23      - resources:
24          kinds:
25          - Namespace
26    mutate:
27      patchStrategicMerge:
28        metadata:
29          labels:
30            istio-injection: enabled

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