An easy-to-use test/mocking framework for developing Cloud applications

pip install localstack==0.10.7


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LocalStack - A fully functional local AWS cloud stack


LocalStack provides an easy-to-use test/mocking framework for developing Cloud applications.

Currently, the focus is primarily on supporting the AWS cloud stack.


  • 2018-01-10: Help wanted! Please fill out this survey to support a research study on the usage of Serverless and Function-as-a-Service (FaaS) services, conducted at Chalmers University of Technology. The survey only takes 5-10 minutes of your time. Many thanks for your participation!!
  • 2017-08-27: We need your support! LocalStack is growing fast, we now have thousands of developers using the platform on a regular basis. Last month we have recorded a staggering 100k test runs, with 25k+ DynamoDB tables, 20k+ SQS queues, 15k+ Kinesis streams, 13k+ S3 buckets, and 10k+ Lambda functions created locally - for 0$ costs (more details to be published soon). Bug and feature requests are pouring in, and we now need some support from you to keep the open source version actively maintained. Please check out Open Collective and become a backer or supporter of the project today! Thanks everybody for contributing. ♥
  • 2017-07-20: Please note: Starting with version 0.7.0, the Docker image will be pushed and kept up to date under the new name localstack/localstack. (This means that you may have to update your CI configurations.) Please refer to the updated End-User License Agreement (EULA) for the new versions. The old Docker image (atlassianlabs/localstack) is still available but will not be maintained any longer.


LocalStack spins up the following core Cloud APIs on your local machine:

Additionally, LocalStack provides a powerful set of tools to interact with the cloud services, including a fully featured KCL Kinesis client with Python binding, simple setup/teardown integration for nosetests, as well as an Environment abstraction that allows to easily switch between local and remote Cloud execution.

Why LocalStack?

LocalStack builds on existing best-of-breed mocking/testing tools, most notably kinesalite/dynalite and moto. While these tools are awesome (!), they lack functionality for certain use cases. LocalStack combines the tools, makes them interoperable, and adds important missing functionality on top of them:

  • Error injection: LocalStack allows to inject errors frequently occurring in real Cloud environments, for instance ProvisionedThroughputExceededException which is thrown by Kinesis or DynamoDB if the amount of read/write throughput is exceeded.
  • Isolated processes: All services in LocalStack run in separate processes. The overhead of additional processes is negligible, and the entire stack can easily be executed on any developer machine and CI server. In moto, components are often hard-wired in RAM (e.g., when forwarding a message on an SNS topic to an SQS queue, the queue endpoint is looked up in a local hash map). In contrast, LocalStack services live in isolation (separate processes available via HTTP), which fosters true decoupling and more closely resembles the real cloud environment.
  • Pluggable services: All services in LocalStack are easily pluggable (and replaceable), due to the fact that we are using isolated processes for each service. This allows us to keep the framework up-to-date and select best-of-breed mocks for each individual service.


  • python (both Python 2.x and 3.x supported)
  • pip (python package manager)
  • Docker


The easiest way to install LocalStack is via pip:

pip install localstack

Note: Please do not use sudo or the root user - LocalStack should be installed and started entirely under a local non-root user. If you have problems with permissions in MacOS X Sierra, install with pip install --user localstack

Running in Docker

By default, LocalStack gets started inside a Docker container using this command:

localstack start

(Note that on MacOS you may have to run TMPDIR=/private$TMPDIR localstack start --docker if $TMPDIR contains a symbolic link that cannot be mounted by Docker.)

Using docker-compose

You can also use the docker-compose.yml file from the repository and use this command (currently requires docker-compose version 2.1+):

docker-compose up

(Note that on MacOS you may have to run TMPDIR=/private$TMPDIR docker-compose up if $TMPDIR contains a symbolic link that cannot be mounted by Docker.)

Use on existing docker-compose project. Add in existing services. The project can be found in docker hub, no need to download or clone source:

version: '2.1'
    image: localstack/localstack
      - "4567-4584:4567-4584"
      - "${PORT_WEB_UI-8080}:${PORT_WEB_UI-8080}"
      - DEBUG=${DEBUG- }
      - DATA_DIR=${DATA_DIR- }
      - PORT_WEB_UI=${PORT_WEB_UI- }
      - DOCKER_HOST=unix:///var/run/docker.sock
      - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"

To facilitate interoperability, configuration variables can be prefixed with LOCALSTACK_ in docker. For instance, setting LOCALSTACK_SERVICES=s3 is equivalent to SERVICES=s3.

Starting locally (non-Docker mode)

Alternatively, the infrastructure can be spun up on the local host machine (without using Docker) using the following command:

localstack start --host

(Note that this will require additional dependencies, and currently is not supported on some operating systems, including Windows.)

LocalStack will attempt to automatically fetch the missing dependencies when you first start it up in "host" mode; alternatively, you can use the full profile to install all dependencies at pip installation time:

pip install localstack[full]


You can pass the following environment variables to LocalStack:

  • SERVICES: Comma-separated list of service names and (optional) ports they should run on. If no port is specified, a default port is used. Service names basically correspond to the service names of the AWS CLI (kinesis, lambda, sqs, etc), although LocalStack only supports a subset of them. Example value: kinesis,lambda:4569,sqs:4570 to start Kinesis on the default port, Lambda on port 4569, and SQS on port 4570. In addition, the following shorthand values can be specified to run a predefined ensemble of services:

    • serverless: run services often used for Serverless apps (iam, lambda, dynamodb, apigateway, s3, sns)
  • DEFAULT_REGION: AWS region to use when talking to the API (defaults to us-east-1).

  • HOSTNAME: Name of the host to expose the services internally (defaults to localhost). Use this to customize the framework-internal communication, e.g., if services are started in different containers using docker-compose.

  • HOSTNAME_EXTERNAL: Name of the host to expose the services externally (defaults to localhost). This host is used, e.g., when returning queue URLs from the SQS service to the client.

  • <SERVICE>_PORT_EXTERNAL: Number of the port to expose a specific service externally (defaults to service ports above) SQS_PORT_EXTERNAL, for example, is used when returning queue URLs from the SQS service to the client.

  • USE_SSL: Whether to use https://... URLs with SSL encryption (defaults to false).

  • KINESIS_ERROR_PROBABILITY: Decimal value between 0.0 (default) and 1.0 to randomly inject ProvisionedThroughputExceededException errors into Kinesis API responses.

  • DYNAMODB_ERROR_PROBABILITY: Decimal value between 0.0 (default) and 1.0 to randomly inject ProvisionedThroughputExceededException errors into DynamoDB API responses.

  • LAMBDA_EXECUTOR: Method to use for executing Lambda functions. Possible values are:

    • local: run Lambda functions in a temporary directory on the local machine
    • docker: run each function invocation in a separate Docker container
    • docker-reuse: create one Docker container per function and reuse it across invocations

    For docker and docker-reuse, if LocalStack itself is started inside Docker, then the docker command needs to be available inside the container (usually requires to run the container in privileged mode). Default is docker, fallback to local if Docker is not available.

  • LAMBDA_REMOTE_DOCKER determines whether Lambda code is copied or mounted into containers. Possible values are:

    • true (default): your Lambda function definitions will be passed to the container by copying the zip file (potentially slower). It allows for remote execution, where the host and the client are not on the same machine.
    • false: your Lambda function definitions will be passed to the container by mounting a volume (potentially faster). This requires to have the Docker client and the Docker host on the same machine.
  • LAMBDA_DOCKER_NETWORK Specifies the docker network for the container running your lambda function.

  • DATA_DIR: Local directory for saving persistent data (currently only supported for these services: Kinesis, DynamoDB, Elasticsearch, S3). Set it to /tmp/localstack/data to enable persistence (/tmp/localstack is mounted into the Docker container), leave blank to disable persistence (default).

  • PORT_WEB_UI: Port for the Web user interface (dashboard). Default is 8080.

  • <SERVICE>_BACKEND: Custom endpoint URL to use for a specific service, where <SERVICE> is the uppercase service name (currently works for: APIGATEWAY, CLOUDFORMATION, DYNAMODB, ELASTICSEARCH, KINESIS, S3, SNS, SQS). This allows to easily integrate third-party services into LocalStack.

  • FORCE_NONINTERACTIVE: when running with Docker, disables the --interactive and --tty flags. Useful when running headless.

  • DOCKER_FLAGS: Allows to pass custom flags (e.g., volume mounts) to "docker run" when running LocalStack in Docker.

  • DOCKER_CMD: Shell command used to run Docker containers, e.g., set to "sudo docker" to run as sudo (default: docker).

  • START_WEB: Flag to control whether the Web API should be started in Docker (values: 0/1; default: 1).

  • LAMBDA_FALLBACK_URL: Fallback URL to use when a non-existing Lambda is invoked. Either records invocations in DynamoDB (value dynamodb://<table_name>) or forwards invocations as a POST request (value http(s)://...).

  • EXTRA_CORS_ALLOWED_HEADERS: Comma-separated list of header names to be be added to Access-Control-Allow-Headers CORS header

  • EXTRA_CORS_EXPOSE_HEADERS: Comma-separated list of header names to be be added to Access-Control-Expose-Headers CORS header

Additionally, the following read-only environment variables are available:

  • LOCALSTACK_HOSTNAME: Name of the host where LocalStack services are available. This is needed in order to access the services from within your Lambda functions (e.g., to store an item to DynamoDB or S3 from Lambda). The variable LOCALSTACK_HOSTNAME is available for both, local Lambda execution (LAMBDA_EXECUTOR=local) and execution inside separate Docker containers (LAMBDA_EXECUTOR=docker).

Dynamically updating configuration at runtime

Each of the service APIs listed above defines a backdoor API under the path /?_config_ which allows to dynamically update configuration variables defined in

For example, to dynamically set KINESIS_ERROR_PROBABILITY=1 at runtime, use the following command:

curl -v -d '{"variable":"KINESIS_ERROR_PROBABILITY","value":1}' 'http://localhost:4568/?_config_'

Initializing a fresh instance

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.

A note about using custom SSL certificates (for USE_SSL=1)

If you need to use your own SSL Certificate and keep it persistent and not use the random automatic generated Certificate, you can place into the localstack temporary directory :


the three named files below :

  • the file server.test.pem must contains your key file content, your certificat and chain certificate files contents (do a cat in this order)
  • the file server.test.pem.crt must contains your certificate and chains files contents (do a 'cat' in this order)
  • the file server.test.pem.key must contains your key file content

Using USE_SSL and own persistent certificate with docker-compose

Typically with docker-compose you can add into docker-compose.yml this volume to the localstack services :

      - "${PWD}/ls_tmp:/tmp/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"

local directory ls_tmp must contains the three files (server.test.pem, server.test.pem.crt, server.test.pem.key)

Accessing the infrastructure via CLI or code

You can point your aws CLI to use the local infrastructure, for example:

aws --endpoint-url=http://localhost:4568 kinesis list-streams
    "StreamNames": []

NEW: Check out awslocal, a thin CLI wrapper that runs commands directly against LocalStack (no need to specify --endpoint-url anymore). Install it via pip install awscli-local, and then use it as follows:

awslocal kinesis list-streams
    "StreamNames": []

UPDATE: Use the environment variable $LOCALSTACK_HOSTNAME to determine the target host inside your Lambda function. See Configurations section for more details.

Client Libraries

Integration with nosetests

If you want to use LocalStack in your integration tests (e.g., nosetests), simply fire up the infrastructure in your test setup method and then clean up everything in your teardown method:

from import infra

def setup():

def teardown():

def my_app_test():
    # here goes your test logic

See the example test file tests/integration/ for more details.

Integration with Serverless

You can use the serverless-localstack plugin to easily run Serverless applications on LocalStack. For more information, please check out the plugin repository here:

Using local code with Lambda

In order to mount a local folder, ensure that LAMBDA_REMOTE_DOCKER is set to false then set the S3 bucket name to __local__ and the S3 key to your local path:

    awslocal lambda create-function --function-name myLambda \
      --code S3Bucket="__local__",S3Key="/my/local/lambda/folder" \
      --handler index.myHandler \
      --runtime nodejs8.10 \
      --role whatever

Integration with Java/JUnit

In order to use LocalStack with Java, the project ships with a simple JUnit runner and a JUnit 5 extension. Take a look at the example JUnit test in ext/java. When you run the test, all dependencies are automatically downloaded and installed to a temporary directory in your system.

import cloud.localstack.LocalstackTestRunner;
import cloud.localstack.TestUtils;

public class MyCloudAppTest {

  public void testLocalS3API() {
    AmazonS3 s3 = TestUtils.getClientS3()
    List<Bucket> buckets = s3.listBuckets();


Or with JUnit 5 :

public class MyCloudAppTest {

Additionally, there is a version of the LocalStack Test Runner which runs in a docker container instead of installing LocalStack on the current machine. The only dependency is to have docker installed locally. The test runner will automatically pull the image and start the container for the duration of the test. The container can be configured by using the @LocalstackDockerProperties annotation.

@LocalstackDockerProperties(services = { "sqs", "kinesis:77077" })
public class MyDockerCloudAppTest {

  public void testKinesis() {
    AmazonKinesis kinesis = DockerTestUtils.getClientKinesis();

    ListStreamsResult streams = kinesis.listStreams();

Or with JUnit 5 :

@LocalstackDockerProperties(services = { "sqs", "kinesis:77077" })
public class MyDockerCloudAppTest {

The LocalStack JUnit test runner is published as an artifact in Maven Central. Simply add the following dependency to your pom.xml file:


You can configure the Docker behaviour using the @LocalstackDockerProperties annotation with the following parameters:

property usage type default value
pullNewImage Determines if a new image is pulled from the docker repo before the tests are run. boolean false
randomizePorts Determines if the container should expose the default local stack ports (4567-4583) or if it should expose randomized ports. boolean false
services Determines which services should be run when the localstack starts. String[] All
imageTag Use a specific image tag for docker container String latest
hostNameResolver Used for determining the host name of the machine running the docker containers so that the containers can be addressed. IHostNameResolver localhost
environmentVariableProvider Used for injecting environment variables into the container. IEnvironmentVariableProvider Empty Map

NB : When specifying the port in the services property, you cannot use randomizePorts = true


  • If you're using AWS Java libraries with Kinesis, please, refer to CBOR protocol issues with the Java SDK guide how to disable CBOR protocol which is not supported by kinesalite.

  • Accessing local S3 from Java: To avoid domain name resolution issues, you need to enable path style access on your client:

// There is also an option to do this if you're using any of the client builder classes:
AmazonS3ClientBuilder builder = AmazonS3ClientBuilder.standard();
  • Mounting the temp. directory: Note that on MacOS you may have to run TMPDIR=/private$TMPDIR docker-compose up if $TMPDIR contains a symbolic link that cannot be mounted by Docker. (See details here:

  • If you run into file permission issues on pip install under Mac OS (e.g., Permission denied: '/Library/Python/2.7/site-packages/'), then you may have to re-install pip via Homebrew (see this discussion thread). Alternatively, try installing with the --user flag: pip install --user localstack

  • If you are deploying within OpenShift, please be aware: the pod must run as root, and the user must have capabilities added to the running pod, in order to allow Elasticsearch to be run as the non-root localstack user.

  • The environment variable no_proxy is rewritten by LocalStack. (Internal requests will go straight via localhost, bypassing any proxy configuration).

  • For troubleshooting LocalStack start issues, you can check debug logs by running DEBUG=1 localstack start

  • In case you get errors related to node/nodejs, you may find (this issue comment: helpful.

  • If you are using AWS Java libraries and need to disable SSL certificate checking, add -Dcom.amazonaws.sdk.disableCertChecking to the java invocation.


Requirements for developing or starting locally

To develop new features, or to start the stack locally (outside of Docker), the following additional tools are required:

  • make
  • npm (node.js package manager)
  • java/javac (Java 8 runtime environment and compiler)
  • mvn (Maven, the build system for Java)

Development Environment

If you pull the repo in order to extend/modify LocalStack, run this command to install all the dependencies:

make install

This will install the required pip dependencies in a local Python virtualenv directory .venv (your global python packages will remain untouched), as well as some node modules in ./localstack/node_modules/. Depending on your system, some pip/npm modules may require additional native libs installed.

The Makefile contains a target to conveniently run the local infrastructure for development:

make infra

Check out the developer guide which contains a few instructions on how to get started with developing (and debugging) features for LocalStack.


The project contains a set of unit and integration tests that can be kicked off via a make target:

make test

Web Dashboard

The projects also comes with a simple Web dashboard that allows to view the deployed AWS components and the relationship between them.

localstack web

Other UI Clients

Change Log

  • v0.10.2: Fix logging issue with async Lambdas; fix kinesis records processing; add basic support for Ref in CloudFormation; fix ddb streams uuid generation; upgrade travis CI setup; fix DynamoDB error messages; cache server processes
  • v0.10.0: Lazy loading of libraries; fix handling of regions; add API multiserver; improve CPU profiling; fix ES xpack installation; add basic EventBridge support; refactor Lambda API and executor; add MessageAttributes on SNS payloads; tagging for SNS; ability to customize docker command
  • v0.9.6: Add API Gateway SQS proxy; fix command to push Docker image; fix Docker bridge IP configuration; fix SSL issue in dashboard infra; updates to README
  • v0.9.5: Reduce Docker image size by squashing; fix response body for presigned URL S3 PUT requests; fix CreateDate returned by IAM; fix account IDs for CF and SNS; fix topic checks for SMS using SNS; improve documentation around @LocalstackDockerProperties; add basic EC2 support; upgrade to ElasticSearch 6.7; set Last-Modified header in S3; preserve logic with uppercase event keys in Java; add support for nodejs 10.x Lambdas
  • v0.9.4: Fix ARNs in CloudFormation deployments; write stderr to file in supervisord; fix Lambda invocation times; fix canonicalization of service names when running in Docker; add support for @Nested in Junit5; add support for batch/transaction in DynamoDB; fix output buffering for subprocesses; assign unique ports under docker-reuse; check if topic ARN exists before publish
  • v0.9.3: Fix output buffering of child processes; new release of Java libs; add imageTag attribute for Java annotation
  • v0.9.2: Update to Python 3 in Dockerfile; preserve attributes when SNS Subscribe; fix event source mapping in Lambda; fix CORS ExposeHeaders; set Lambda timeout in secs; add tags support for Lambda/Firehose; add message attributes for SQS/Lambda; fix shard count support for Kinesis; fix port mappings for CloudFormation
  • v0.9.1: Define dependent and composite services in config; forward Lambda logs to CloudWatch Logs; add SQS event deserializing for Lambda; fix AWS_PROXY for JSON list payload; add START_WEB config parameter; return correct location for S3 multipart uploads; add support for Lambda custom runtime; fix account ID for IAM responses; fix using correct SSL cert; limit memory usage for Java processes; fix unicode encoding for SNS messages; allow using LOCALSTACK_ prefix in Docker environment variables; enable request forwarding for non-existing Lambdas; fix large downloads for S3; add API endpoint for dynamically updating config variables; fix CloudFormation stack update
  • v0.9.0: Enhance integration with Serverless; refactor CloudFormation implementation; add support for Step Functions, IAM, STS; fix CloudFormation integration; support mounting Lambda code locally; add docker-entrypoint-initaws.d dir for initializing resources; add S3Event Parser for Lambda; fix S3 chunk encoding; fix S3 multipart upload notification; add dotnetcore2.1 and ruby2.5 Lambda runtimes; fix issues with JDK 9; install ES plugins available in AWS
  • v0.8.10: Add kclpy to pip package; fix badges in README
  • v0.8.9: Replace moto-ext with upstream moto; fix SNS message attributes; fix swagger; make external SQS port configurable; support for SNS DeleteTopic; S3 notifications for multipart uploads; support requestContext in AWS_PROXY integration; update docs for SSL usage
  • v0.8.8: Support Docker network config for Lambda containers; support queryStringParameters for Lambda AWS_PROXY apigateway; add AWS SecretsManager service; add SQS/Lambda integration; add support for Firehose Kinesis source; add GetAlias to Lambda API; add function properties to LambdaContext for invocations; fix extraction of Java Lambda archives; check region headers for SNS; fix Lambda output buffering; fix S3 download of gzip; bump ElasticMQ to 0.14.5; fix Lambda response codes; fix syntax issues for Python 3.7
  • v0.8.7: Support .Net Core 2.0 and nodejs8.10 Lambdas; refactor Java libs and integrate with JUnit 5; support tags for ES domains; add CloudFormation support for SNS topics; fix kinesis error injection; fix override of ES_JAVA_OPTS; fix SQS CORS preflight response; fix S3 content md5 checks and Host header; fix ES startup issue; Bump elasticmq to 0.13.10; bump kinesalite version
  • v0.8.6: Fixes for Windows installation; bump ES to 6.2.0; support filter policy for SNS; upgrade kinesalite; refactor JUnit runner; support Lambda PutFunctionConcurrency and GetEventSourceMapping; fixes for Terraform; add golang support to Lambda; fix file permission issue in Java Lambda tests; fix S3 bucket notification config
  • v0.8.5: Fix DDB streams event type; implement CF Fn::GetAZs; async lambda for DDB events; fix S3 content-type; fix CF deployer for SQS; fix S3 ExposePorts; fix message subject in SNS; support for Firehose -> ES; pass external env vars to containers from Java; add mock for list-queue-tags; enhance docker test runner; fix Windows installation issues; new version of Java libs
  • v0.8.4: Fix pipenv dependency issue; Docker JUnit test runner; POJO type for Java Lambda RequestHandler; Java Lambda DynamoDB event; reuse Docker containers for Lambda invocations; API Gateway wildcard path segments; fix SNS RawMessageDelivery
  • v0.8.3: Fix DDB stream events for UPDATE operations; fix DDB streams sequence numbers; fix transfer-encoding for DDB; fix requests with missing content-length header; support non-ascii content in DynamoDB items; map external port for SQS queue URLs; default to LAMBDA_REMOTE_DOCKER=true if running in Docker; S3 lifecycle support; reduce Docker image size
  • v0.8.2: Fix S3 bucket notification configuration; CORS headers for API Gateway; fix >128k S3 multipart uploads; return valid ShardIDs in DynamoDB Streams; fix hardcoded "ddblocal" DynamoDB TableARN; import default service ports from localstack-client; fix S3 bucket policy response; Execute lambdas asynchronously if the source is a topic
  • v0.8.1: Improvements in Lambda API: publish-version, list-version, function aliases; use single map with Lambda function details; workaround for SQS .fifo queues; add test for S3 upload; initial support for SSM; fix regex to replace SQS queue URL hostnames; update linter (single quotes); use docker.for.mac.localhost to connect to LocalStack from Docker on Mac; fix b64 encoding for Java Lambdas; fix path of moto_server command
  • v0.8.0: Fix request data in GenericProxyHandler; add $PORT_WEB_UI and $HOSTNAME_EXTERNAL configs; API Gateway path parameters; enable flake8 linting; add config for service backend URLs; use ElasticMQ instead of moto for SQS; expose $LOCALSTACK_HOSTNAME; custom environment variable support for Lambda; improve error logging and installation for Java/JUnit; add support for S3 REST Object POST
  • v0.7.5: Fix issue with incomplete parallel downloads; bypass http_proxy for internal requests; use native Python code to unzip archives; download KCL client libs only for testing and not on pip install
  • v0.7.4: Refactor CLI and enable plugins; support unicode names for S3; fix SQS names containing a dot character; execute Java Lambda functions in Docker containers; fix DynamoDB error handling; update docs
  • v0.7.3: Extract proxy listeners into (sub-)classes; put java libs into a single "fat" jar; fix issue with non-daemonized threads; refactor code to start flask services
  • v0.7.2: Fix DATA_DIR config when running in Docker; fix Maven dependencies; return 'ConsumedCapacity' from DynamoDB get-item; use Queue ARN instead of URL for S3 bucket notifications
  • v0.7.1: Fix S3 API to GET bucket notifications; release Java artifacts to Maven Central; fix S3 file access from Spark; create DDB stream on UpdateTable; remove AUI dependency, optimize size of Docker image
  • v0.7.0: Support for Kinesis in CloudFormation; extend and integrate Java tests in CI; publish Docker image under new name; update READMEs and license agreements
  • v0.6.2: Major refactoring of installation process, lazy loading of dependencies
  • v0.6.1: Add CORS headers; platform compatibility fixes (remove shell commands and sh module); add CloudFormation validate-template; fix Lambda execution in Docker; basic domain handling in ES API; API Gateway authorizers
  • v0.6.0: Load services as plugins; fix service default ports; fix SQS->SNS and MD5 of message attributes; fix Host header for S3
  • v0.5.5: Enable SSL encryption for all service endpoints (USE_SSL config); create Docker base image; fix issue with DATA_DIR
  • v0.5.4: Remove hardcoded /tmp/ for Windows-compat.; update CLI and docs; fix S3/SNS notifications; disable Elasticsearch compression
  • v0.5.3: Add CloudFormation support for serverless / API Gateway deployments; fix installation via pypi; minor fix for Java (passing of environment variables)
  • v0.5.0: Extend DynamoDB Streams API; fix keep-alive connection for S3; fix deadlock in nested Lambda executions; add integration SNS->Lambda; CloudFormation serverless example; replace dynalite with DynamoDBLocal; support Lambda execution in remote Docker container; fix CloudWatch metrics for Lambda invocation errors
  • v0.4.3: Initial support for CloudWatch metrics (for Lambda functions); HTTP forwards for API Gateway; fix S3 message body signatures; download Lambda archive from S3 bucket; fix/extend ES tests
  • v0.4.2: Initial support for Java Lambda functions; CloudFormation deployments; API Gateway tests
  • v0.4.1: Python 3 compatibility; data persistence; add seq. numbers in Kinesis events; limit Elasticsearch memory
  • v0.4.0: Execute Lambda functions in Docker containers; CORS headers for S3
  • v0.3.11: Add Route53, SES, CloudFormation; DynamoDB fault injection; UI tweaks; refactor config
  • v0.3.10: Add initial support for S3 bucket notifications; fix subprocess32 installation
  • v0.3.9: Make services/ports configurable via $SERVICES; add tests for Firehose+S3
  • v0.3.8: Fix Elasticsearch via local bind and proxy; refactoring; improve error logging
  • v0.3.5: Fix lambda handler name; fix host name for S3 API; install web libs on pip install
  • v0.3.4: Fix file permissions in build; fix and add UI to Docker image; add stub of ES API
  • v0.3.3: Add version tags to Docker images
  • v0.3.2: Add support for Redshift API; code refactoring
  • v0.3.1: Add Dockerfile and push image to Docker Hub
  • v0.3.0: Add simple integration for JUnit; improve process signal handling
  • v0.2.11: Refactored the AWS assume role function
  • v0.2.10: Added AWS assume role functionality.
  • v0.2.9: Kinesis error response formatting
  • v0.2.7: Throw Kinesis errors randomly
  • v0.2.6: Decouple SNS/SQS: intercept SNS calls and forward to subscribed SQS queues
  • v0.2.5: Return error response from Kinesis if flag is set
  • v0.2.4: Allow Lambdas to use file (import from file instead of exec'ing)
  • v0.2.3: Improve Kinesis/KCL auto-checkpointing (leases in DDB)
  • v0.2.0: Speed up installation time by lazy loading libraries
  • v0.1.19: Pass shard_id in records sent from KCL process
  • v0.1.16: Minor restructuring and refactoring (create separate
  • v0.1.14: Fix AWS tokens when creating Elasticsearch client
  • v0.1.11: Add startup/initialization notification for KCL process
  • v0.1.10: Bump version of amazon_kclpy to 1.4.1
  • v0.1.9: Add initial support for SQS/SNS
  • v0.1.8: Fix installation of JARs in amazon_kclpy if localstack is installed transitively
  • v0.1.7: Bump version of amazon_kclpy to 1.4.0
  • v0.1.6: Add travis-ci and coveralls configuration
  • v0.1.5: Refactor Elasticsearch utils; fix bug in method to delete all ES indexes
  • v0.1.4: Enhance logging; extend java KCL credentials provider (support STS assumed roles)
  • v0.1.2: Add configurable KCL log output
  • v0.1.0: Initial release


We welcome feedback, bug reports, and pull requests!

For pull requests, please stick to the following guidelines:

  • Add tests for any new features and bug fixes. Ideally, each PR should increase the test coverage.
  • Follow the existing code style (e.g., indents). A PEP8 code linting target is included in the Makefile.
  • Put a reasonable amount of comments into the code.
  • Separate unrelated changes into multiple pull requests.
  • 1 commit per PR: Please squash/rebase multiple commits into one single commit (to keep the history clean).

Please note that by contributing any code or documentation to this repository (by raising pull requests, or otherwise) you explicitly agree to the Contributor License Agreement.


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Copyright (c) 2017-2019 LocalStack maintainers and contributors.

Copyright (c) 2016 Atlassian and others.

This version of LocalStack is released under the Apache License, Version 2.0 (see LICENSE.txt). By downloading and using this software you agree to the End-User License Agreement (EULA).

We build on a number of third-party software tools, including the following:

Third-Party software License
Python/pip modules:
airspeed BSD License
amazon_kclpy Amazon Software License
boto3 Apache License 2.0
coverage Apache License 2.0
docopt MIT License
elasticsearch Apache License 2.0
flask BSD License
flask_swagger MIT License
jsonpath-rw Apache License 2.0
moto Apache License 2.0
pep8 Expat license
requests Apache License 2.0
subprocess32 PSF License
Node.js/npm modules:
kinesalite MIT License
Other tools:
Elasticsearch Apache License 2.0