localstack的Lambda函数中DynamoDB的端点URL

Question

我正在使用localstack进行本地开发。我有一个名为readings的DynamoDB表，并且我想插入来自lambda函数的项。

我已经在python运行时中部署了简单的lambda函数：

import os
import boto3

def lambda_handler(events, context):
    DYNAMODB_ENDPOINT_URL = os.environ.get("DYNAMODB_ENDPOINT_URL")
    dynamodb = boto3.resource("dynamodb", endpoint_url=DYNAMODB_ENDPOINT_URL)
    readings_table = dynamodb.Table(DYNAMODB_READINGS_TABLE_NAME)

    readings_table.put_item(Item={"reading_id": "10", "other": "test"})

但是我得到了错误：[ERROR] EndpointConnectionError: Could not connect to the endpoint URL: "http://localstack:4569/"

我尝试过结合使用localhost和localstack以及端口：4566和4569。他们都失败了。

下面是我用来启动本地堆栈的docker-compse服务

    localstack:
        image: localstack/localstack:0.11.2
        ports:
            - 4566:4566
            - 8080:8080
        environment:
            SERVICES: "dynamodb,sqs,lambda,iam"
            DATA_DIR: "/tmp/localstack/data"
            PORT_WEB_UI: "8080"
            LOCALSTACK_HOSTNAME: localstack
            LAMBDA_EXECUTOR: docker
            AWS_ACCESS_KEY_ID: "test"
            AWS_SECRET_ACCESS_KEY: "test"
            AWS_DEFAULT_REGION: "us-east-1"
        volumes:
            - localstack_volume:/tmp/localstack/data
            - /var/run/docker.sock:/var/run/docker.sock
            # When a container is started for the first time, it will execute files with extensions .sh that are found in /docker-entrypoint-initaws.d. 
            # Files will be executed in alphabetical order. You can easily create aws resources on localstack using `awslocal` (or `aws`) cli tool in the initialization scripts.
            # source: https://github.com/localstack/localstack/pull/1018/files#diff-04c6e90faac2675aa89e2176d2eec7d8R185
            - ./localstack-startup-scripts/:/docker-entrypoint-initaws.d/

为了向本地堆栈的DynamoDB发送请求，我必须在lambda中设置正确的端点url是什么？

Answer 1

根据the docs的说法，LOCALSTACK_HOSTNAME是一个只读的环境变量：

LOCALSTACK_HOSTNAME: LocalStack服务可用的主机的名称。使用此主机名作为端点(例如，http://${LOCALSTACK_HOSTNAME}:4566)，以便从Lambda函数中访问服务(例如，将项从Lambda存储到DynamoDB或S3 )。

Answer 2

 try with 
 ports:      
    - "0.0.0.0:4566-4599:4566-4599"  

希望能有所帮助