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Var substitution opt-in docs #389

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Jul 7, 2021
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Var substitution opt-in docs #389

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Var substitution opt-in
oliverbaehler Jul 7, 2021
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More explicit example
oliverbaehler Jul 7, 2021
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17 changes: 17 additions & 0 deletions docs/spec/v1beta1/kustomization.md
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Expand Up @@ -803,6 +803,23 @@ labeling or annotating them with:
kustomize.toolkit.fluxcd.io/substitute: disabled
```

Substitution of variables only happens if at least a single variable or resource to substitute
from is defined. This may cause issues if you rely on expressions which should evaluate to a
default, even if no other variables are configured. To work around this, one can set an
arbitrary key/value pair to enable the substitution of variables. For example:

```
apiVersion: kustomize.toolkit.fluxcd.io/v1beta1
kind: Kustomization
metadata:
name: apps
spec:
...
postBuild:
substitute:
var_substitution_enabled: "true"
```

You can replicate the controller post-build substitutions locally using
[kustomize](https://github.com/kubernetes-sigs/kustomize)
and Drone's [envsubst](https://github.com/drone/envsubst):
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