使用 docker-compose 服务名称从 LocalStack lambda 函数连接到数据库容器

Question

我正在尝试从 localstack 中的 lambda 函数连接到另一个容器中的数据库运行，但 lambda 函数无法解析服务名称。

version: '3.9'
services:
  db:
    image: mysql:5.7
    container_name: db
    restart: always
    environment:
      MYSQL_DATABASE: 'my_db'
      MYSQL_USER: 'admin'
      MYSQL_PASSWORD: 'password'
      MYSQL_ROOT_PASSWORD: 'password'
    ports:
      - '3306:3306'
    expose:
      - '3306'
    volumes:
      - my-db:/var/lib/mysql
    networks:
      - development

localstack:
    image: localstack/localstack:latest
    hostname: localstack
    container_name: localstack
    environment:
      - AWS_DEFAULT_REGION=us-west-2
      - EDGE_PORT=4566
      - SERVICES=s3,lambda,apigateway,sqs
      - DEBUG=1
      - HOSTNAME_EXTERNAL=localstack
      - DB_HOST=db
      - DB_USER=admin
      - DB_PASSWORD=password
    networks:
      - development
    depends_on:
      - db
    ports:
      - '4566-4583:4566-4583'
    volumes:
      - "${TEMPDIR:-/tmp/localstack}:/tmp/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"

networks:
  development:

volumes:
  my-db:

问题是 db 可以从 localstack 容器解析（例如 docker-compose exec localstack ping db），但是 lambda 函数说 db 无法解析。

我认为您可以添加 LAMBDA_DOCKER_NETWORK=development as an environment variable to the localstack service to connect the lambda functions to that network (see discussion)，但是当我这样做时，我收到一条错误消息，显示 network development not found

docker.errors.NotFound: 404 Client Error for http+docker://localhost/v1.41/containers/f98dc74016048bc2295cf1bbf4af09c03e9a78faf5b1462f1130a76e0ca4f850/start: Not Found ("network development not found")

我也看到了这个：

requests.exceptions.HTTPError: 404 Client Error: Not Found for url: http+docker://localhost/v1.41/containers/1071c60ce1dd44800c38f726ef526388ce1a090bb1e394724cdfcbb76fb7e906/start

Answer 1

看起来连接到正确网络的方法是在 environment:

中进行设置

LAMBDA_DOCKER_NETWORK=<networkname>

所以在上面的例子中：

LAMBDA_DOCKER_NETWORK=development

documentation

使用 docker-compose 服务名称从 LocalStack lambda 函数连接到数据库容器

Connect from LocalStack lambda function to a database container using docker-compose service name

docker-compose

localstack