`dockercompose up`未指定上下文

Question

当我使用docker-compose up运行docker-compose.yml文件时，它会输出：

ERROR: The Compose file is invalid because:
Service webserver has neither an image nor a build context specified. At least one must be provided.

在运行docker-compose up之前，我使用成功的Dockerfile运行了docker build .。到目前为止，我只尝试过退出、重新启动Docker，并使用docker system prune -a删除Docker映像、容器、卷和网络

以下是Dockerfile：

WORKDIR /usr/local/airflow/
COPY requirements.txt ./
RUN pip install --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt
COPY . .

这是docker-compose.yml文件：

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

        build:
            args:
                PYTHON_DEPS: "boto3==1.12.41, notebook==6.0.3, numpy==1.18.1, pandas==0.25.3, psycopg2==2.8.4"
                AIRFLOW_DEPS: "aws, postgres"

以下是requirement.txt文件：

boto3==1.12.41
notebook==6.0.3
numpy==1.18.1
pandas==0.25.3
psycopg2==2.8.4

Answer 1

在webserver.build内缺少context参数，该参数应指向Dockerfile所在的相对路径：

build:
  context: .
  args:
    PYTHON_DEPS: "boto3==1.12.41, notebook==6.0.3, numpy==1.18.1, pandas==0.25.3, psycopg2==2.8.4"
    AIRFLOW_DEPS: "aws, postgres"

参考：https://docs.docker.com/compose/compose-file/#build