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[Strategic Merge Patch]: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-api-machinery/strategic-merge-patch.md
[JSON patches]: https://tools.ietf.org/html/rfc6902
[label selector]: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors
# 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：
```yaml
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` 。
<!-- @createDeployment @test -->
```bash
DEMO_HOME=$(mktemp -d)
cat <<EOF >$DEMO_HOME/kustomization.yaml
resources:
- deployments.yaml
EOF
cat <<EOF >$DEMO_HOME/deployments.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy1
spec:
template:
metadata:
labels:
old-label: old-value
spec:
containers:
- name: nginx
image: nginx
args:
- one
- two
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy2
spec:
template:
metadata:
labels:
key: value
spec:
containers:
- name: busybox
image: busybox
EOF
```
声明 [Strategic Merge Patch] 文件以注入 sidecar 容器：
<!-- @addPatch @test -->
```bash
cat <<EOF >$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
<!-- @applyPatch @testAgainstLatestRelease -->
```bash
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。
<!-- @confirmPatch @test -->
```bash
test 2 == \
$(kustomize build $DEMO_HOME | grep "image: docker.io/istio/proxyv2" | wc -l); \
echo $?
```
输出如下：
```yaml
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
```yaml
target:
name: name*
```
- 选择所有 Deployment 资源
```yaml
target:
kind: Deployment
```
- 选择 label 与 `app=hello` 匹配的资源
```yaml
target:
labelSelector: app=hello
```
- 选择 annotation 与 `app=hello` 匹配的资源
```yaml
target:
annotationSelector: app=hello
```
- 选择所有 label 与 `app=hello` 匹配的 Deployment 资源
```yaml
target:
kind: Deployment
labelSelector: app=hello
```
|
