Setting up DynamoDB in a Local Dev Environment

Did you know? You can work with AWS DynamoDB on your local machine. Yes, that’s right. In this article, we are going to set up DynamoDB locally. There are a couple of ways to do this.

Having this local version helps you save on throughput, data storage, and data transfer fees. In addition, you don’t need an internet connection while you develop your application.

Let’s get started.

Option 1. Using executable .jar file

The downloadable version of Amazon DynamoDB is provided as an executable .jar file. The application runs on Windows, Linux, macOS, and other platforms that support Java.

After download, extract the content and run the DynamoDB using the following command:

java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb

Before you can access DynamoDB programmatically or through the AWS Command Line Interface (AWS CLI), you must configure your credentials to enable authorization for your applications. Downloadable DynamoDB requires any credentials to work, as shown in the following example.

AWS Access Key ID: "fakeMyKeyId"
AWS Secret Access Key: "fakeSecretAccessKey"

You can use $aws configure command to set up the credentials.

Now you can access your local DynamoDB using APIs. For e.g to list local dynamodb tables:

aws dynamodb list-tables --endpoint-url http://localhost:8000

#aws #serverless #database #dynamodb

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A GUI for Local DynamoDB- Dynamodb-Admin

Quick Start Guide

1. Install the package globally from npm.

$ npm install -g dynamodb-admin

2. Run DynamoDB locally inside a Docker container

Make sure you have Docker installed on your system. Instructions are here.

Now pull and run the Docker dynamodb-local image to spin up your very own DynamoDB instance running on port 8000.

$ docker pull amazon/dynamodb-local
$ docker run -p 8000:8000 amazon/dynamodb-local

3. Start dynamodb-admin (with defaults)

MacOS/Linux

$ dynamodb-admin

Windows

> export DYNAMO_ENDPOINT=http://localhost:8000
> dynamodb-admin

After these steps you will have:

An instance of DynamoDB running locally at http://localhost:8000
A GUI that replicates the functionality of the AWS console running on http://localhost:8001

The next step is to create a table and start reading/writing to it!

Advanced Setup

You may need to override regions, endpoints and/or credentials to peek inside local DynamoDB instances you have spun up to replicate a production environment.

If so, just override the defaults when starting the service. You can override some, or all of these, as required.

DYNAMO_ENDPOINT=http://localhost:<PORT> AWS_REGION=<AWS-REGION> AWS_ACCESS_KEY_ID=<YOUR-ACCESS-KEY> AWS_SECRET_ACCESS_KEY=<YOUR-SECRET> dynamodb-admin

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