docker-compose构建环境变量

Question

FROM mhart/alpine-node:10
ADD . /app
WORKDIR /app
RUN apk --no-cache add --virtual builds-deps build-base python &&\
    yarn global add nodemon &&\
    yarn &&\
    apk del builds-deps build-base python

这个码头商。yml：

version: "3.3"
services:

  api:
    build:
      context: .
      dockerfile: Dockerfile-preprod
    image: registry.git.louis-girones.fr:4567/make-your-night/back:preprod
    environment:
      - NODE_ENV=development
    env_file:
      - .env
    volumes:
      - .:/app
    ports:
      - "${PORT_PREPROD}:${PORT_PREPROD}"
    command: sh -c "mkdir -p dist && touch ./dist/app.js && yarn run start"

  mongo:
    image: mongo:4.0
    ports:
      - "${MONGO_PREPROD}"
    command: mongod
    volumes:
      - ./data:/data/db

  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.1.1
    volumes:
      - ./esdata:/usr/share/elasticsearch/data
    environment:
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - discovery.type=single-node
    ports:
      - "9300:9300"
      - "9200:9200"

volumes:
  esdata:

使用这个。env文件（它位于根文件夹中，如docker-compose.yml和Dockerfile）：

#!/usr/bin/env bash

NODE_ENV=development
PORT=9000
SECRET_SESSION=superSecr3t
APP_NAME=Night Vision
API_VERSION=/api/v0/
DEFAULT_TZ=Europe/Paris
ASSETS_URI=http://localhost:9000/public/img/
BCRYPT_WORKFACTOR=1
ES_PORT=9200
ES_LOG_LEVEL=trace

和节点服务器启动中的以下代码：

// Export the config object based on the NODE_ENV
// ==============================================
const config: IConfig = commonConfig

if (commonConfig.env === 'development') {
    _.merge(config, developmentConfig)
} else if (commonConfig.env === 'test') {
    _.merge(config, testConfig)
} else if (commonConfig.env === 'preproduction') {
    _.merge(config, preproductionConfig)
} else if (commonConfig.env === 'production') {
    _.merge(config, productionConfig)
} else {
    throw new Error('Please set an environment')
}

env_file:
  - .env

 environment:
  - NODE_ENV=development

[Warning] One or more build-args [NODE_ENV] were not consumed
Successfully built 9b14dd5abc3f

我真的更喜欢使用第一种或第二种方法

docker版本:18.06.1-CE docker-compose版本:1.19.0

Answer 1

文件里有一条说明：

注意：如果您的服务指定了构建选项，在环境中定义的变量在构建过程中不会自动可见。使用build的args子选项定义生成时环境变量。

这里也有描述。首先（如上所述），您需要在DockerFile中指定arg:

FROM mhart/alpine-node:10
ARG NODE_ENV
ENV NODE_ENV $NODE_ENV
ADD . /app
WORKDIR /app
RUN apk --no-cache add --virtual builds-deps build-base python &&\
    yarn global add nodemon &&\
    yarn &&\
    apk del builds-deps build-base python

build:
  context: .
  dockerfile: Dockerfile-preprod
  args:
    - NODE_ENV=development

build:
  context: .
  dockerfile: Dockerfile-preprod
  args:
    - NODE_ENV=${NODE_ENV}