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Demo: multibases with a common base

kustomize encourages defining multiple variants - e.g. dev, staging and prod, as overlays on a common base.

It's possible to create an additional overlay to compose these variants together - just declare the overlays as the bases of a new kustomization.

This is also a means to apply a common label or annotation across the variants, if for some reason the base isn't under your control. It also allows one to define a left-most namePrefix across the variants - something that cannot be done by modifying the common base.

The following demonstrates this using a base that is just a single pod.

Define a place to work:

DEMO_HOME=$(mktemp -d)

Define a common base:

BASE=$DEMO_HOME/base
mkdir $BASE

cat <<EOF >$BASE/kustomization.yaml
resources:
- pod.yaml
EOF

cat <<EOF >$BASE/pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod
  labels:
    app: myapp
spec:
  containers:
  - name: nginx
    image: nginx:1.7.9
EOF

Define a dev variant overlaying base:

DEV=$DEMO_HOME/dev
mkdir $DEV

cat <<EOF >$DEV/kustomization.yaml
resources:
- ./../base
namePrefix: dev-
EOF

Define a staging variant overlaying base:

STAG=$DEMO_HOME/staging
mkdir $STAG

cat <<EOF >$STAG/kustomization.yaml
resources:
- ./../base
namePrefix: stag-
EOF

Define a production variant overlaying base:

PROD=$DEMO_HOME/production
mkdir $PROD

cat <<EOF >$PROD/kustomization.yaml
resources:
- ./../base
namePrefix: prod-
EOF

Then define a Kustomization composing three variants together:

cat <<EOF >$DEMO_HOME/kustomization.yaml
resources:
- ./dev
- ./staging
- ./production

namePrefix: cluster-a-
EOF

Now the workspace has following directories

.
├── base
│   ├── kustomization.yaml
│   └── pod.yaml
├── dev
│   └── kustomization.yaml
├── kustomization.yaml
├── production
│   └── kustomization.yaml
└── staging
    └── kustomization.yaml

Confirm that the kustomize build output contains three pod objects from dev, staging and production variants.

test 1 == \
  $(kustomize build $DEMO_HOME | grep cluster-a-dev-myapp-pod | wc -l); \
  echo $?
  
test 1 == \
  $(kustomize build $DEMO_HOME | grep cluster-a-stag-myapp-pod | wc -l); \
  echo $?
  
test 1 == \
  $(kustomize build $DEMO_HOME | grep cluster-a-prod-myapp-pod | wc -l); \
  echo $?

Similarly to adding different namePrefix in different variants, one can also add different namespace and compose those variants in one kustomization. For more details, take a look at multi-namespaces.