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124 lines
2.8 KiB
Markdown
124 lines
2.8 KiB
Markdown
# 示例: 应用 json patch（json补丁）
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kustomization文件支持通过[JSON patches](https://tools.ietf.org/html/rfc6902)来修改已有的资源.
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下面的例子将会使用这个功能对`Ingress`加以修改.
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首先，创建一个包含`ingress`的`kustomization`文件.
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<!-- @createIngress @testAgainstLatestRelease -->
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```bash
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DEMO_HOME=$(mktemp -d)
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cat <<EOF >$DEMO_HOME/kustomization.yaml
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resources:
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- ingress.yaml
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EOF
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cat <<EOF >$DEMO_HOME/ingress.yaml
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: my-ingress
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spec:
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rules:
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- host: foo.bar.com
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http:
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paths:
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- backend:
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serviceName: my-api
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servicePort: 80
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EOF
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```
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定义一个JSON patch文件，以更新`Ingress`对象的2个字段:
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- 把 host 从 `foo.bar.com` 改为 `foo.bar.io`
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- 把 servicePort 从 `80` 改为 `8080`
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<!-- @addJsonPatch @testAgainstLatestRelease -->
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```bash
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cat <<EOF >$DEMO_HOME/ingress_patch.json
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[
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{"op": "replace", "path": "/spec/rules/0/host", "value": "foo.bar.io"},
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{"op": "replace", "path": "/spec/rules/0/http/paths/0/backend/servicePort", "value": 8080}
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]
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EOF
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```
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JSON patch 也可以写成 YAML 的格式.该例子顺便展示了“添加”操作：
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<!-- @addYamlPatch @testAgainstLatestRelease -->
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```bash
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cat <<EOF >$DEMO_HOME/ingress_patch.yaml
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- op: replace
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path: /spec/rules/0/host
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value: foo.bar.io
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- op: add
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path: /spec/rules/0/http/paths/-
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value:
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path: '/test'
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backend:
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serviceName: my-test
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servicePort: 8081
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EOF
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```
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在kustomization.yaml文件中增加 _patchesJson6902_ 字段，以应用该补丁
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<!-- @applyJsonPatch @testAgainstLatestRelease -->
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```bash
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cat <<EOF >>$DEMO_HOME/kustomization.yaml
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patchesJson6902:
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- target:
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group: extensions
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version: v1beta1
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kind: Ingress
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name: my-ingress
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path: ingress_patch.json
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EOF
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```
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运行 `kustomize build $DEMO_HOME`, 在输出那里确认 host 已经被正确更新.
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<!-- @confirmHost @testAgainstLatestRelease -->
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```bash
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test 1 == \
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$(kustomize build $DEMO_HOME | grep "host: foo.bar.io" | wc -l); \
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echo $?
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```
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运行 `kustomize build $DEMO_HOME`, 在输出那里确认 servicePort 已经被正确更新.
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<!-- @confirmServicePort @testAgainstLatestRelease -->
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```bash
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test 1 == \
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$(kustomize build $DEMO_HOME | grep "servicePort: 8080" | wc -l); \
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echo $?
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```
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如果 patch 是YAML格式的，就能正确解析:
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<!-- @applyYamlPatch @testAgainstLatestRelease -->
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```bash
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cat <<EOF >>$DEMO_HOME/kustomization.yaml
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patchesJson6902:
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- target:
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group: extensions
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version: v1beta1
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kind: Ingress
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name: my-ingress
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path: ingress_patch.yaml
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EOF
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```
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运行 `kustomize build $DEMO_HOME`, 在输出那里确认有 `/test` 这个路径.
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<!-- @confirmYamlPatch @testAgainstLatestRelease -->
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```bash
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test 1 == \
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$(kustomize build $DEMO_HOME | grep "path: /test" | wc -l); \
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echo $?
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``` |