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116 lines
2.3 KiB
Markdown
116 lines
2.3 KiB
Markdown
# Demo: multi namespaces with a common base
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`kustomize` supports defining multiple variants with different namespace, as overlays on a common base.
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It's possible to create an additional overlay to compose these variants
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together - just declare the overlays as the bases of a new kustomization. The
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following demonstrates this using a base that's just one pod.
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Define a place to work:
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<!-- @makeWorkplace @testAgainstLatestRelease -->
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```
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DEMO_HOME=$(mktemp -d)
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```
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Define a common base:
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<!-- @makeBase @testAgainstLatestRelease -->
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```
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BASE=$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 >$BASE/pod.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: myapp-pod
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labels:
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app: myapp
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spec:
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containers:
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- name: nginx
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image: nginx:1.7.9
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EOF
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```
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Define a variant in namespace-a overlaying base:
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<!-- @makeNamespaceA @testAgainstLatestRelease -->
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```
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NSA=$DEMO_HOME/namespace-a
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mkdir $NSA
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cat <<EOF >$NSA/kustomization.yaml
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resources:
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- namespace.yaml
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- ../base
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namespace: namespace-a
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EOF
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cat <<EOF >$NSA/namespace.yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: namespace-a
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EOF
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```
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Define a variant in namespace-b overlaying base:
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<!-- @makeNamespaceB @testAgainstLatestRelease -->
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```
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NSB=$DEMO_HOME/namespace-b
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mkdir $NSB
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cat <<EOF >$NSB/kustomization.yaml
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resources:
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- namespace.yaml
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- ../base
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namespace: namespace-b
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EOF
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cat <<EOF >$NSB/namespace.yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: namespace-b
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EOF
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```
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Then define a _Kustomization_ composing two variants together:
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<!-- @makeTopLayer @testAgainstLatestRelease -->
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```
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cat <<EOF >$DEMO_HOME/kustomization.yaml
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resources:
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- namespace-a
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- namespace-b
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EOF
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```
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Now the workspace has following directories
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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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> ├── kustomization.yaml
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> ├── namespace-a
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> │ ├── kustomization.yaml
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> │ └── namespace.yaml
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> └── namespace-b
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> ├── kustomization.yaml
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> └── namespace.yaml
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> ```
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Confirm that the `kustomize build` output contains two pod objects from namespace-a and namespace-b.
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<!-- @confirmVariants @testAgainstLatestRelease -->
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```
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test 2 == \
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$(kustomize build $DEMO_HOME| grep -B 4 "namespace: namespace-[ab]" | grep "name: myapp-pod" | wc -l); \
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echo $?
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```
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