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[WFLY-21891] Explain env var syntax in MP RM QS #1164

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[WFLY-21891] Explain env var syntax in MP RM QS #1164

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2 changes: 2 additions & 0 deletions microprofile-reactive-messaging-kafka/README-source.adoc
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Expand Up @@ -495,6 +495,8 @@ What comes after these prefixes is vendor dependent. We use the SmallRye impleme

At the application level, the `mp.messaging.connector.smallrye-kafka.bootstrap.servers` property says that all conections to Kafka in this application should go to `localhost:9092`. This is not strictly necessary, since this value is the default that would be used if not specified. If we wanted to override this for say the `@Outgoing("to-kafka")` annotated `sendToKafka()` method we could specify this with a property such as:

NOTE: When deploying to Kubernetes or OpenShift via Helm charts, these MicroProfile Config properties are typically set as environment variables. The conversion follows the MicroProfile Config specification: uppercase the property name and replace each non-alphanumeric character (dots, hyphens) with an underscore. For example, `mp.messaging.connector.smallrye-kafka.bootstrap.servers` becomes `MP_MESSAGING_CONNECTOR_SMALLRYE_KAFKA_BOOTSTRAP_SERVERS`. See the `charts/helm.yaml` file in this quickstart for an example.

[source, properties]
----
mp.messaging.outgoing.to-kafka.bootstrap.servers=otherhost:9092
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2 changes: 2 additions & 0 deletions microprofile-reactive-messaging-kafka/charts/helm.yaml
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Expand Up @@ -7,5 +7,7 @@ build:
deploy:
replicas: 1
env:
# Environment variable form of mp.messaging.connector.smallrye-kafka.bootstrap.servers
# (see MicroProfile Config spec for property-to-env-var mapping rules)
- name: MP_MESSAGING_CONNECTOR_SMALLRYE_KAFKA_BOOTSTRAP_SERVERS
value: my-cluster-kafka-bootstrap:9092
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