docker schema registry and kafka rest cannot up

Question

both zookeeper and Kafka communicated well and up running.

not sure why the schema registry and Kafka rest cannot up.

below is the docker-compose file.

this is the schema and rest docker-compose file. error on this docker

[main] ERROR io.confluent.admin.utils.cli.KafkaReadyCommand - Error while running kafka-ready.
java.lang.RuntimeException: No endpoints found for security protocol [PLAINTEXT]. Endpoints found in ZK [{EXTERNAL=localhost:9092, INTERNAL=kafka:29092}]
        at io.confluent.admin.utils.cli.KafkaReadyCommand.main(KafkaReadyCommand.java:143)



[main] INFO org.apache.zookeeper.ZooKeeper - Session: 0x1003f4a8fa10006 closed
[main] ERROR io.confluent.admin.utils.cli.KafkaReadyCommand - Error while running kafka-ready.
java.lang.RuntimeException: No endpoints found for security protocol [PLAINTEXT]. Endpoints found in ZK [{EXTERNAL=localhost:9092, INTERNAL=kafka:29092}]
        at io.confluent.admin.utils.cli.KafkaReadyCommand.main(KafkaReadyCommand.java:143)

Docker Compose:

schema-registry:
    network_mode: pm
    image: confluentinc/cp-schema-registry:5.2.1
    hostname: schema-registry
    container_name: schema-registry
    depends_on:
      - zookeeper
      - kafka
    ports:
      - "8081:8081"
    environment:
      SCHEMA_REGISTRY_HOST_NAME: 'schema-registry'
      SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL: 'zookeeper:2181'
      SCHEMA_REGISTRY_LISTENERS: "http://schema-registry:8081"

  rest-proxy:
    network_mode: pm
    image: confluentinc/cp-kafka-rest:5.2.1
    depends_on:
      - zookeeper
      - kafka
      - schema-registry
    ports:
      - "8082:8082"
    hostname: rest-proxy
    container_name: rest-proxy
    environment:
      KAFKA_REST_HOST_NAME: 'rest-proxy'
      KAFKA_REST_BOOTSTRAP_SERVERS: 'kafka:29092'
      KAFKA_REST_LISTENERS: "http://rest-proxy:8082"
      KAFKA_REST_SCHEMA_REGISTRY_URL: 'http://schema-registry:8081'
      KAFKA_REST_ZOOKEEPER_CONNECT: 'zookeeper:2181' 

this is the zk and kafka docker compose

  zookeeper:
    network_mode: pm
    image: wurstmeister/zookeeper
    hostname: zookeeper
    container_name: zookeeper
    ports:
      - "2181:2181"
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
      ALLOW_ANONYMOUS_LOGIN: 1

  kafka:
    network_mode: pm
    image: wurstmeister/kafka
    hostname: kafka
    container_name: kafka
    depends_on:
      - zookeeper
    ports:
      - "9092:9092"
    environment:
      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
      KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'true'
      ALLOW_PLAINTEXT_LISTENER: 'yes'
      KAFKA_ADVERTISED_HOST_NAME: kafka
      KAFKA_LISTENERS: "INTERNAL://:29092,EXTERNAL://:9092"
      KAFKA_ADVERTISED_LISTENERS: "INTERNAL://kafka:29092,EXTERNAL://localhost:9092"
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: "INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT"
      KAFKA_INTER_BROKER_LISTENER_NAME: "INTERNAL"
      KAFKA_ZOOKEEPER_SESSION_TIMEOUT: "6000"
      KAFKA_RESTART_ATTEMPTS: "10"
      KAFKA_RESTART_DELAY: "5"
      ZOOKEEPER_AUTOPURGE_PURGE_INTERVAL: "0"

Answer 1

It cannot start because it doesn't know which of the two listeners you are trying to connect to. This cannot be determined by providing a ZK address, AFAIK. You shouldn't need Zookeeper for anything other than Kafka, anyway.

For example, you could use the existing all-in-one compose file for Confluent

In particular, notice the REST Proxy doesn't have ZK

https://github.com/confluentinc/cp-all-in-one/blob/5.5.0-post/cp-all-in-one-community/docker-compose.yml#L139-L143

For Schema Registry: https://docs.confluent.io/current/schema-registry/installation/deployment.html#ak-based-primary-election