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genderbee
Asked: 2021-07-28 11:31:18 +0800 CST

Reverse Proxy to local container

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I need run Kafka on docker with web UI on some specific domain AND LINK, for example:

http://somesite.com/kafka

I am using this docker-compose.yml.

version: '3.3'
services:
  zookeeper:
    image: 'bitnami/zookeeper:latest'
    ports:
      - '2181:2181'
    environment:
      - ALLOW_ANONYMOUS_LOGIN=yes
  kafka:
    image: 'bitnami/kafka:latest'
    ports:
      - '9092:9092'
    environment:
      - KAFKA_BROKER_ID=1
      - KAFKA_CFG_LISTENERS=PLAINTEXT://:9092
      - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://127.0.0.1:9092
      - KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper:2181
      - ALLOW_PLAINTEXT_LISTENER=yes
    depends_on:
      - zookeeper
  kafka-ui:
    image: 'provectuslabs/kafka-ui:latest'
    environment:
      - KAFKA_CLUSTERS_0_NAME=local
      - KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS=kafka:9092
      - KAFKA_CLUSTERS_0_ZOOKEEPER=zookeeper:2181
    depends_on:
      - kafka
    networks:
      - default
    ports:
      - '9099:8080'

When I set apache2 by direct domain kafka.somesite.com, it is working.

<VirtualHost *:80>
  ServerName kafka.somesite.com
  ProxyPreserveHost On
  ProxyPass / http://127.0.0.1:9099/
  ProxyPassReverse / http://127.0.0.1:9099/
</VirtualHost>

But when I try set domain with the link somesite.com/kafka, there is only blank screen.

<VirtualHost *:80>
  ServerName somesite.com
  ProxyPreserveHost On
  ProxyPass /kafka http://127.0.0.1:9099/
  ProxyPassReverse /kafka http://127.0.0.1:9099/
</VirtualHost>

How can I make Kafka functional with link?

Thank you.

http reverse-proxy apache2 docker

2 Answers

  1. ServerName should still be somesite.com, because Apache still expects that as base URL. When the URL is somesite.com/kafka it should redirect it to http://127.0.0.1:9099/

    Bottom line, the second configuration should work as long as you set ServerName somesite.com

    • 0

  2. You have to change two things. First, you need to configure the base URL of the kafka-ui container, you can do that using the SERVER_SERVLET_CONTEXT_PATH environment variable.

    # ...
  kafka-ui:
    image: 'provectuslabs/kafka-ui:latest'
    environment:
      - KAFKA_CLUSTERS_0_NAME=local
      - KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS=kafka:9092
      - KAFKA_CLUSTERS_0_ZOOKEEPER=zookeeper:2181
      - SERVER_SERVLET_CONTEXT_PATH=/kafka
# ...

    If you don't, all URLs generated by the kafka-ui will start at /, resulting in CSS, JavaScript and such being fetched from / instead of /kafka/.

    Then you need to adapt the ProxyPass directive to that path:

    ProxyPass /kafka/ http://127.0.0.1:9099/kafka/
ProxyPassReverse /kafka/ http://127.0.0.1:9099/kafka/

    With ProxyPass always make sure your trailing slashes match, as noted in the documentation:

    If the first argument ends with a trailing /, the second argument should also end with a trailing /, and vice versa. Otherwise, the resulting requests to the backend may miss some needed slashes and do not deliver the expected results.

    • 0