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24 lines
962 B
Markdown
24 lines
962 B
Markdown
# configmapcontroller
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This controller watches for changes to `ConfigMap` and `Secret` objects and performs rolling upgrades on their associated deployments, deamonsets and statefulsets and updating dynamically.
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This is particularly useful if the `ConfigMap` is used to define environment variables - or your app cannot easily and reliably watch the `ConfigMap` and update itself on the fly.
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## How to use configmapcontroller
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For a `Deployment` called `foo` have a `ConfigMap` called `foo`. Then add this annotation to your `Deployment`
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```yaml
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metadata:
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annotations:
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configmap.fabric8.io/update-on-change: "foo"
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```
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Then, providing `configmapcontroller` is running, whenever you edit the `ConfigMap` called `foo` the configmapcontroller will update the `Deployment` by adding the environment variable:
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```
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FABRICB_FOO_REVISION=${configMapRevision}
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```
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This then triggers a rolling upgrade of your deployment's pods to use the new configuration.
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