version: "3.4" services: postgres: hostname: postgres image: postgres:9.5 restart: always volumes: - ./postgres/create_db.sh:/docker-entrypoint-initdb.d/20-create_db.sh # To persist your PostgreSQL databases outside of the Docker image, to # prevent data loss, you will need to add something like this: # - ./path/to/persistent/storage:/var/lib/postgresql/data environment: POSTGRES_PASSWORD: itsasecret POSTGRES_USER: dendrite networks: - internal zookeeper: hostname: zookeeper image: zookeeper networks: - internal kafka: container_name: dendrite_kafka hostname: kafka image: wurstmeister/kafka environment: KAFKA_ADVERTISED_HOST_NAME: "kafka" KAFKA_DELETE_TOPIC_ENABLE: "true" KAFKA_ZOOKEEPER_CONNECT: "zookeeper:2181" depends_on: - zookeeper networks: - internal networks: internal: attachable: true