docker - 在Docker撰写文件中设置.env变量时遇到问题

Question

我试图遵循Docker文档和SO建议，但是在尝试“docker-compose up db”时仍然出现“variable not set”错误。有人可以检查我的.env和yaml文件吗？两者都在同一个目录中，但是yml似乎没有读取.env ???
.env:

FS_NAME=MY_BLOG_NAME
FS_REGION=us-east-2
DB_HOST=localhost
DB_USER=postgres
DB_PASS=$$323MY_PASS$&84
DB_NAME=postgres

docker-compose.yml:

version: '3.7'
volumes:
    db_data:

x-shared_environment: &shared_environment
   LOG_LEVEL: ${LOG_LEVEL:-debug}
   DATABASE_HOST: ${DB_HOST}
   DATABASE_NAME: ${DB_NAME}
   DATABASE_USERNAME: ${DB_USERNAME}
   DATABASE_PASSWORD: ${DB_PASSWORD}

services:
  app:
    image: MY_BLOG_NAME:latest
    build:
      context: .
    environment:
      <<: *shared_environment
      FS_NAME: ${FS_NAME}
      FS_REGION: ${FS_REGION}
    depends_on:
    - db
    ports:
      - '8080:8080'
      
db:
    image: postgres:12.2-apline
    volumes:
        -db_data/var/lib/postrgresql/data/pgdata
    environment:
        PGDATA: /var/lib/postgresql/data/pgdata
        POSTGRES_USER: {DB_USERNAME}
        POSTGRESS_PASSWORD: {DB_PASSWORD}
        POSTGRES_DB: {DB_NAME}
        POSTGRESS_PASSWORD: {DB_PASSWORD}
    ports:
        -'5432:5432'

Answer 1

您需要指定.env文件的目录，为每个服务添加env_file配置。
https://docs.docker.com/compose/environment-variables/
例如:

db:
    image: postgres:12.2-apline
    volumes:
        -db_data/var/lib/postrgresql/data/pgdata
    env_file: 
        - ./.env
    environment:
        PGDATA: /var/lib/postgresql/data/pgdata
        POSTGRES_USER: {DB_USERNAME}
        POSTGRESS_PASSWORD: {DB_PASSWORD}
        POSTGRES_DB: {DB_NAME}
        POSTGRESS_PASSWORD: {DB_PASSWORD}
    ports:
        -'5432:5432'