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128 lines
2.7 KiB
Markdown
128 lines
2.7 KiB
Markdown
# 示例：多 Overlay 使用相同 base
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`kustomize` 鼓励定义多个 variants：例如在通用的 base 上使用 dev、staging 和 prod overlay。
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可以创建其他 overlay 来将这些 variants 组合在一起：只需将 overlay 声明为新 kustomization 的 base 即可。
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如果 base 由于某种原因无法控制，将多个 variants 组合在一起也可以为他们添加通用的 label 或 annotation。
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下面使用一个 pod 作为 base 来进行演示。
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首先创建一个工作空间：
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<!-- @makeWorkplace @testAgainstLatestRelease -->
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```
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DEMO_HOME=$(mktemp -d)
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```
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定义一个通用的 base：
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<!-- @makeBase @testAgainstLatestRelease -->
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```
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BASE=$DEMO_HOME/base
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mkdir $BASE
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cat <<EOF >$BASE/kustomization.yaml
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resources:
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- pod.yaml
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EOF
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cat <<EOF >$BASE/pod.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: myapp-pod
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labels:
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app: myapp
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spec:
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containers:
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- name: nginx
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image: nginx:1.7.9
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EOF
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```
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定义 dev variant：
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<!-- @makeDev @testAgainstLatestRelease -->
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```
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DEV=$DEMO_HOME/dev
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mkdir $DEV
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cat <<EOF >$DEV/kustomization.yaml
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resources:
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- ./../base
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namePrefix: dev-
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EOF
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```
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定义 staging variant：
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<!-- @makeStaging @testAgainstLatestRelease -->
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```
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STAG=$DEMO_HOME/staging
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mkdir $STAG
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cat <<EOF >$STAG/kustomization.yaml
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resources:
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- ./../base
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namePrefix: stag-
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EOF
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```
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定义 production variant：
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<!-- @makeProd @testAgainstLatestRelease -->
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```
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PROD=$DEMO_HOME/production
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mkdir $PROD
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cat <<EOF >$PROD/kustomization.yaml
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resources:
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- ./../base
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namePrefix: prod-
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EOF
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```
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然后定义一个 _Kustomization_，将三个 variants 组合在一起：
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<!-- @makeTopLayer @testAgainstLatestRelease -->
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```
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cat <<EOF >$DEMO_HOME/kustomization.yaml
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resources:
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- ./dev
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- ./staging
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- ./production
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namePrefix: cluster-a-
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EOF
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```
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现在工作空间有如下目录：
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> ```
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> .
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> ├── base
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> │ ├── kustomization.yaml
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> │ └── pod.yaml
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> ├── dev
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> │ └── kustomization.yaml
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> ├── kustomization.yaml
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> ├── production
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> │ └── kustomization.yaml
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> └── staging
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> └── kustomization.yaml
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> ```
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输出包含三个 pod 对象，分别来自 dev、staging 和 production variants。
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<!-- @confirmVariants @testAgainstLatestRelease -->
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```
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test 1 == \
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$(kustomize build $DEMO_HOME | grep cluster-a-dev-myapp-pod | wc -l); \
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echo $?
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test 1 == \
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$(kustomize build $DEMO_HOME | grep cluster-a-stag-myapp-pod | wc -l); \
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echo $?
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test 1 == \
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$(kustomize build $DEMO_HOME | grep cluster-a-prod-myapp-pod | wc -l); \
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echo $?
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```
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与在不同的 variants 中添加不同的 `namePrefix` 类似，也可以添加不同的 `namespace` 并在一个 _kustomization_ 中组成这些 variants。更多的详细信息，请查看[multi-namespaces](multi-namespace.md)。
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