Overwrite the CORS Header witha docker-compose file

[AngeloBadellino]

Having the followinf Docker-Compose

  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    restart: unless-stopped
    ports:
      - "2181:2181"
    environment:
      - ZOOKEEPER_CLIENT_PORT=2181
      - ZOOKEEPER_TICK_TIME=2000

  kafka:
    image: confluentinc/cp-kafka:latest
    ports:
      - "59092:9092"
    environment:
      - KAFKA_BROKER_ID= 1
      - KAFKA_ZOOKEEPER_CONNECT= zookeeper:2181
      - KAFKA_ADVERTISED_LISTENERS= PLAINTEXT://kafka:9092
      - KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR= 1
    depends_on:
      - zookeeper

  schema_registry:
    image: confluentinc/cp-schema-registry:latest
    ports:
      - '58081:8081'
    restart: unless-stopped
    environment:
      - SCHEMA_REGISTRY_LISTENERS= http://127.0.0.1:8081
      - SCHEMA_REGISTRY_HOST_NAME= schema
      - SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL= zookeeper:2181
    depends_on:
      - kafka
      - zookeeper

  proxy:
    image: confluentinc/cp-kafka-rest:latest
    ports:
      - '58082:8082'
    environment:
      - KAFKA_REST_ZOOKEEPER_CONNECT= zookeeper:2181
      - KAFKA_REST_SCHEMA_REGISTRY_URL= schema:8081
      - KAFKA_REST_HOST_NAME= proxy
      - KAFKA_REST_LISTENERS= http://127.0.0.1:8082
    depends_on:
      - schema_registry
      - kafka
      - zookeeper

  kafka-ui:
    image: landoop/kafka-topics-ui:latest
    ports:
      - 58000:8000
    environment:
      - KAFKA_REST_PROXY_URL=http://127.0.0.1:8082
      - PROXY=True
    depends_on:
      - proxy
      - kafka

I am getting the CONNECTIVITY ERROR well know problem.
I am trying to figure out how to overwrite the kafka.rest.conf settings.

Any help?

[andmarios]

Try to set KAFKA_REST_LISTENERS to http://proxy:8082, and accordingly KAFKA_REST_PROXY_URL to the same value.

Btw, exposing the broker port at 59092 won't work for your host. Clients will want to connect to the advertised listeners.

[AngeloBadellino]

Hi thank you forthe reply.
Unfortunatly I am getting the same error. Opening the dev panel I see errors similar to:

Possibly unhandled rejection: Failed at method [GET] [http://proxy:8082/topics] with error: 
{"data":null,"status":-1,"config":{"method":"GET","transformRequest":[null],"transformResponse":[null],"jsonpCallbackParam":"callback","url":"http://proxy:8082/topics","dataType":"json","headers":{}},"statusText":""}

Bdw, I get response if access that link directly from the host machine.

[andmarios]

Please change PROXY=True to PROXY=true or PROXY=1 as it is case sensitive.

[s3ni0r]

Hi @AngeloBadellino ,
the confluent docker images have some scripts that transform all environment variables prefixed with $COMPONENT_ like (SCHEMA_REGISTRY, KAFKA_REST) into configuration using a template file, for instance in your docker-compose file, if you would like to add a configuration entry like heap.opts to your schema-registry.properties you can declare an environment variable in your docker service as follow :

environment:
  SCHEMA_REGISTRY_HEAP_OPTS: -Xms1g -Xmx1g
  SCHEMA_REGISTRY_ACCESS_CONTROL_ALLOW_METHODS: GET,POST,PUT,OPTIONS

then when you run your docker service, it will be added into your configuration file as :

heap.opts=-Xms1g -Xmx1g
access.control.allow.methods=GET,POST,PUT,OPTIONS

Hope this helps.