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Kafka

A single-node Kafka broker running in KRaft mode, for Event Streams demos. Ignition talks to it through its built-in Kafka connector and Event Streams modules, so no third-party .modl is needed on the gateway side.

Imageconfluentinc/cp-kafka:8.2.1 (override with KAFKA_IMAGE in .env)
Catalog kindstreaming
Provideskafka-broker
Requiresnothing
Network when split is onbackend

Preset configuration​

The generated .env ships these defaults; edit them before docker compose up:

  • KAFKA_PORT=9094: host port for external Kafka clients.
  • KAFKA_CLUSTER_ID=4L6g3nShT-eMCtK--X86sw: KRaft cluster ID. KRaft mode requires a stable cluster ID; this one is baked in so the single-node broker formats its storage deterministically. Leave it unless you have a reason to rotate it.

Post-setup​

  • kafka-connector: configure Ignition's built-in Kafka connector to point at kafka:9092 from inside the gateway once the broker is up. Containers on the same network reach the broker at kafka:9092; the 9094 host port is for clients outside Docker.