Airflow change port in docker compose

Question

I have airflow running locally on port 8080 with the following docker-compose.yaml:

version: '3.7'
services:
    postgres:
        image: postgres:9.6
        environment:
            - POSTGRES_USER=airflow
            - POSTGRES_PASSWORD=airflow
            - POSTGRES_DB=airflow
        logging:
            options:
                max-size: 10m
                max-file: "3"

    webserver:
        image: puckel/docker-airflow:1.10.9
        restart: always
        depends_on:
            - postgres
        environment:
            - LOAD_EX=y
            - EXECUTOR=Local
        logging:
            options:
                max-size: 10m
                max-file: "3"
        volumes:
            - ./dags:/usr/local/airflow/dags
            # Add this to have third party packages
            - ./requirements.txt:/requirements.txt
            # - ./plugins:/usr/local/airflow/plugins
        ports:
            - "8080:8080"
        command: webserver
        healthcheck:
            test: ["CMD-SHELL", "[ -f /usr/local/airflow/airflow-webserver.pid ]"]
            interval: 30s
            timeout: 30s
            retries: 3

However I need the port 8080 for another process. I tried updating to both "8080:8081" and "8081:8081" but neither worked, server would not respond. "8080:8080", however, works like a charm. What am I missing here?

Answer 1

I think you missed the only correct option. The syntax for ports is:

{host : container}

so in your case

8081:8080

should technically work. Assuming of course that airflow runs on port 8080 and has that one exposed (which it seems according to the dockerfile).