docker-compose.byo-kafka.yml

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# ─────────────────────────────────────────────────────────────────────────────
# Bring-your-own Kafka — drop the bundled broker.
#
#   docker compose -f docker-compose.quickstart.yml -f docker-compose.byo-kafka.yml up -d
#
# Requires KAFKA_BROKERS to point at your cluster, e.g. in .env:
#   KAFKA_BROKERS=b-1.mycluster.kafka.us-east-1.amazonaws.com:9092
#
# Without this overlay the app tier already honours KAFKA_BROKERS — but the
# bundled `kafka` service still started and still held its 1 GB mem_limit, so a
# BYO deployment paid for a broker nothing talked to.
#
# ── How the removal works, and why it is spelled this way ────────────────────
# Compose overlays merge; they cannot delete a service. Assigning a profile that
# is never activated is the supported way to exclude one, because a service in a
# non-active profile is absent from the rendered project entirely.
#
# That half alone is a trap. A service excluded by profile is still named by
# `depends_on` in the base file, and Compose rejects the whole project with
# "depends on undefined service kafka" — nothing starts, which is strictly worse
# than the waste this overlay removes. The pairing fix lives in the base file:
# every `depends_on: kafka` there carries `required: false`. Both halves are
# needed; either one alone takes the stack down.
#
# ── What still runs ──────────────────────────────────────────────────────────
# `kafka-init` is deliberately NOT excluded. It creates the prefixed topics with
# the KAFKA_REPLICATION_FACTOR / KAFKA_MIN_INSYNC_REPLICAS you set, which is
# exactly what a real multi-broker cluster needs (RF=1 topics go unavailable
# during routine rolling maintenance). If your cluster's ACLs forbid topic
# creation, create them out of band and add `kafka-init` to this file the same
# way `kafka` is handled below. See docs/deployment/kafka-acls.md.
# ─────────────────────────────────────────────────────────────────────────────
services:
  kafka:
    # Never activated => the bundled broker is excluded from the project.
    profiles: ["bundled-broker-disabled"]