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示例：通过一个 patch 来修改多个资源

kustomization.yaml 支持通过 Strategic Merge Patch 和 [JSON patch] 来自定义资源。自 3.1.0 起，一个 patch 可以修改多个资源。

这可以通过指定 patch 和它所修改的 target 来完成，如下所示：

patches:
- path: <PatchFile>
  target:
    group: <Group>
    version: <Version>
    kind: <Kind>
    name: <Name>
    namespace: <Namespace>
    labelSelector: <LabelSelector>
    annotationSelector: <AnnotationSelector>

labelSelector 和 annotationSelector 都应遵循 label selector 中的约定。Kustomize 选择匹配target中所有字段的目标来应用 patch 。

下面的示例展示了如何为所有部署资源注入 sidecar 容器。

创建一个包含 Deployment 资源的 kustomization 。

DEMO_HOME=$(mktemp -d)

cat <<EOF >$DEMO_HOME/kustomization.yaml
resources:
- deployments.yaml
EOF

cat <<EOF >$DEMO_HOME/deployments.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy1
spec:
  template:
    metadata:
      labels:
        old-label: old-value
    spec:
      containers:
        - name: nginx
          image: nginx
          args:
          - one
          - two
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy2
spec:
  template:
    metadata:
      labels:
        key: value
    spec:
      containers:
        - name: busybox
          image: busybox
EOF

声明 Strategic Merge Patch 文件以注入 sidecar 容器：

cat <<EOF >$DEMO_HOME/patch.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: not-important
spec:
  template:
    spec:
      containers:
        - name: istio-proxy
          image: docker.io/istio/proxyv2
          args:
          - proxy
          - sidecar
EOF

在 kustomization.yaml 中添加 patches 字段

cat <<EOF >>$DEMO_HOME/kustomization.yaml
patches:
- path: patch.yaml
  target:
    kind: Deployment
EOF

运行 kustomize build $DEMO_HOME，可以在输出中确认两个 Deployment 资源都已正确应用。

test 2 == \
  $(kustomize build $DEMO_HOME | grep "image: docker.io/istio/proxyv2" | wc -l); \
  echo $?

输出如下：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy1
spec:
  template:
    metadata:
      labels:
        old-label: old-value
    spec:
      containers:
      - args:
        - proxy
        - sidecar
        image: docker.io/istio/proxyv2
        name: istio-proxy
      - args:
        - one
        - two
        image: nginx
        name: nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy2
spec:
  template:
    metadata:
      labels:
        key: value
    spec:
      containers:
      - args:
        - proxy
        - sidecar
        image: docker.io/istio/proxyv2
        name: istio-proxy
      - image: busybox
        name: busybox

Target 选择

  • 选择名称与 name* 匹配的资源 
    target:
  name: name*
  • 选择所有 Deployment 资源 
    target:
  kind: Deployment
  • 选择 label 与 app=hello 匹配的资源 
    target:
  labelSelector: app=hello
  • 选择 annotation 与 app=hello 匹配的资源 
    target:
  annotationSelector: app=hello
  • 选择所有 label 与 app=hello 匹配的 Deployment 资源 
    target:
  kind: Deployment
  labelSelector: app=hello