Overview of configuration options in LocalStack

LocalStack exposes various configuration options to control its behaviour.

These options can be passed to LocalStack as environment variables like so:

$ DEBUG=1 localstack start

To facilitate interoperability, configuration variables can be prefixed with LOCALSTACK_ in docker. For instance, setting LOCALSTACK_PERSISTENCE=1 is equivalent to PERSISTENCE=1.

You can also use Profiles.

Configurations marked as Deprecated will be removed in the next major version. You can find previously removed configuration variables under Legacy.


Options that affect the core LocalStack system.

VariableExample ValuesDescription
DEBUG0 (default) |1Flag to increase log level and print more verbose logs (useful for troubleshooting issues)
IMAGE_NAMElocalstack/localstack (default), localstack/localstack:0.11.0Specific name and tag of LocalStack Docker image to use.
GATEWAY_LISTEN0.0.0.0:4566 (default in Docker mode) (default in host mode)Configures the bind addresses of LocalStack. It has the form <ip address>:<port>(,<ip address>:<port>)*. LocalStack Pro adds port 443. (default)This is interpolated into URLs and addresses that are returned by LocalStack. It has the form <hostname>:<port>.
USE_SSL0 (default)Whether to return URLs using HTTP (0) or HTTPS (1). Changed with 3.0.0. In earlier versions this was toggling SSL support on or off.
PERSISTENCE0 (default)Enable persistence. See Persistence Mechanism and Filesystem Layout.
MAIN_CONTAINER_NAMElocalstack-main (default)Specify the main docker container name
LS_LOGtrace, trace-internal, debug, info, warn, error, warningSpecify the log level. Currently overrides the DEBUG configuration. trace for detailed request/response, trace-internal for internal calls, too.
EXTERNAL_SERVICE_PORTS_START4510 (default)Start of the External Service Port Range (inclusive).
EXTERNAL_SERVICE_PORTS_END4560 (default)End of the External Service Port Range (exclusive).
EAGER_SERVICE_LOADING0 (default) |1Boolean that toggles lazy loading of services. If eager loading is enabled, services are started at LocalStack startup rather than their first use. Be aware that eager loading increases the LocalStack startup time.
SERVICESs3,sqsA comma-delimited string of services. Check the internal health endpoint /_localstack/health for valid service names. If SERVICES is set LocalStack will only load the listed services. All other services will be disabled and cannot be used.
ALLOW_NONSTANDARD_REGIONS0 (default)Allows the use of non-standard AWS regions. By default, LocalStack only accepts standard AWS regions.
PARITY_AWS_ACCESS_KEY_ID0 (default)Enables the use production-like access key IDs. By default, LocalStack issues keys with LSIA... and LKIA... prefix, and will reject keys that start with ASIA... or AKIA....


These options are applicable when using the CLI to start LocalStack.

VariableExample ValuesDescription
LOCALSTACK_VOLUME_DIR~/.cache/localstack/volume (on Linux)The location on the host of the LocalStack volume directory mount. See Filesystem Layout
CONFIG_PROFILEThe configuration profile to load. See Profiles
CONFIG_DIR~/.localstackThe path where LocalStack can find configuration profiles and other CLI-specific configuration


Options to configure how LocalStack interacts with Docker.

VariableExample ValuesDescription
DOCKER_FLAGSAllows to pass custom flags (e.g., volume mounts) to “docker run” when running LocalStack in Docker.
DOCKER_SOCK/var/run/docker.sockPath to local Docker UNIX domain socket
DOCKER_BRIDGE_IP172.17.0.1IP of the docker bridge used to enable access between containers
LEGACY_DOCKER_CLIENT0|1Whether LocalStack should use the command-line Docker client and subprocess execution to run Docker commands, rather than the Docker SDK.
DOCKER_CMDdocker (default), sudo dockerShell command used to run Docker containers (only used in combination with LEGACY_DOCKER_CLIENT)
FORCE_NONINTERACTIVEWhen running with Docker, disables the --interactive and --tty flags. Useful when running headless.

Local AWS Services

This section covers configuration options that are specific to certain AWS services.


VariableExample ValuesDescription
GRAPHQL_ENDPOINT_STRATEGYlegacy|domain|pathGoverns how AppSync endpoints are created to access a GraphQL API (see AppSync Endpoints)


VariableExample ValuesDescription
BATCH_DOCKER_FLAGS-e TEST_ENV=1337Additional flags provided to the batch container. Same restrictions as LAMBDA_DOCKER_FLAGS.

BigData (EMR, Athena, Glue)

VariableExample ValuesDescription
BIGDATA_DOCKER_NETWORKNetwork the bigdata should be connected to. The LocalStack container has to be connected to that network as well. Per default, the bigdata container will be connected to a network LocalStack is also connected to.
BIGDATA_DOCKER_FLAGSAdditional flags for the bigdata container. Same restrictions as LAMBDA_DOCKER_FLAGS.


VariableExample ValuesDescription
CFN_LEGACY_TEMPLATE_DEPLOYER0 (default) |1Switch back to the old deployment engine. Note that this is only available temporarily to allow for a smoother roll-out of the new deployment order.
CFN_PER_RESOURCE_TIMEOUT300 (default)Set the timeout to deploy each individual CloudFormation resource.
CFN_VERBOSE_ERRORS0 (default) |1Show exceptions for CloudFormation deploy errors.
CFN_STRING_REPLACEMENT_DENY_LIST"" (default) |, list of AWS URLs that should not be modified to point to Localstack. For example, when deploying a CloudFormation template we might want to leave certain resources pointing to actual AWS URLs, or even leave environment variables with URLs like that untouched.


VariableExample ValuesDescription
PROVIDER_OVERRIDE_CLOUDWATCHv2Use the new CloudWatch provider.


VariableExample ValuesDescription
DOCDB_PROXY_CONTAINER0 (default) |1Whether the DocumentDB starts the MongoDB container proxied over LocalStack container. When enabled lambda functions can use the Endpoint configuration of the DocDB cluster or instance to connect to the DocumentDB. By default the container starts without proxy as standalone container.


VariableExample ValuesDescription
DYNAMODB_ERROR_PROBABILITYDecimal value between 0.0(default) and 1.0Randomly inject ProvisionedThroughputExceededException errors into DynamoDB API responses.
DYNAMODB_HEAP_SIZE256m (default), 1GSets the JAVA EE maximum memory size for DynamoDB; full table scans require more memory
DYNAMODB_SHARE_DB0|1When activated, DynamodDB will use a single database instead of separate databases for each credential and region.
DYNAMODB_IN_MEMORY0 (default) |1When activated, DynamodDB will start in in-memory mode, which can have a faster throughput. If you use this options, both persistence and cloud pods will not work for DynamoDB
DYNAMODB_OPTIMIZE_DB_BEFORE_STARTUP0|1Optimize the database tables in the store before starting
DYNAMODB_DELAY_TRANSIENT_STATUSES0|1When activated, DynamoDB will introduce artificial delays in resource creation to simulate the actual cloud service more closely. Currently works only for CREATING and DELETING online index statuses.
DYNAMODB_CORS*Enable CORS support for specific allow-list list the domains separated by , use * for public access (default is *)
DYNAMODB_REMOVE_EXPIRED_ITEMS0|1Enables Time to Live (TTL) feature


VariableExample ValuesDescription
ECR_ENDPOINT_STRATEGYdomain (default)|off|Governs how the default ECR endpoints are returned


VariableExample ValuesDescription
ECS_REMOVE_CONTAINERS0|1 (default)Remove Docker containers associated with ECS tasks after execution. Disabling this and dumping container logs might help with troubleshooting failing ECS tasks.
ECS_DOCKER_FLAGS--privileged, --dns flags passed to Docker when creating ECS task containers. Same restrictions as LAMBDA_DOCKER_FLAGS.
ECS_DISABLE_AWS_ENDPOINT_URL0 (default) | 1Whether to disable injecting the environment variable AWS_ENDPOINT_URL, which automatically configures supported AWS SDKs.
ECS_TASK_EXECUTORkubernetesWhether to run ECS tasks when LocalStack is deployed on Kubernetes. Tasks are added to ELB load balancer target groups.


VariableExample ValuesDescription
EC2_DOCKER_FLAGS--privilegedAdditional flags passed to Docker when launching containerized instances. Same restrictions as LAMBDA_DOCKER_FLAGS.
EC2_DOCKER_INIT0|1 (default)Start container instances with docker-init system, learn more here. Disable this if you want to use a custom init system.
EC2_DOWNLOAD_DEFAULT_IMAGES0|1 (default)At startup, LocalStack Pro downloads latest Ubuntu images from Docker Hub for use as AMIs. This can be disabled for security reasons.
EC2_EBS_MAX_VOLUME_SIZE1000 (default)Maximum size (in MiBs) of user-specified EBS block devices mounted into EC2 container instances.
EC2_MOUNT_BLOCK_DEVICES1|0 (default)Whether to create and mount user-specified EBS block devices into EC2 container instances.
EC2_REMOVE_CONTAINERS0|1 (default)Controls whether created Docker containers are removed at instance termination or LocalStack shuts down. Disable this if there is a need to examine the container filesystem for debugging.
EC2_VM_MANAGERdocker(default)|libvirt|mockEmulation method to use in LocalStack Pro. This option is not available in LocalStack community.


VariableExample ValuesDescription
EKS_LOADBALANCER_PORT8081 (default)Local port on which the Kubernetes load balancer is exposed on the host.
EKS_K3S_IMAGE_TAGv1.22.6-k3s1 (default)Custom tag of the k8s/rancher image used to spin up Kubernetes clusters locally.


VariableExample ValuesDescription
PROVIDER_OVERRIDE_ELASTICACHElegacyUse the legacy ElastiCache provider.
REDIS_CONTAINER_MODE1|0 (default)Start ElastiCache cache nodes in separate containers instead of in the LocalStack container



VariableExample ValuesDescription
PROVIDER_OVERRIDE_EVENTSv2Use the new EventBridge provider.


VariableExample ValuesDescription
ENFORCE_IAM0 (default)|1Enable IAM policy evaluation and enforcement. If this is disabled (the default), IAM policies will have no effect to your requests.
IAM_SOFT_MODE0 (default)|1Enable IAM soft mode. This leads to policy evaluation without actually denying access. Needs ENFORCE_IAM enabled as well. For more information, see Identity and Access Management.


VariableExample ValuesDescription
KINESIS_ERROR_PROBABILITYDecimal value between 0.0(default) and 1.0Randomly inject ProvisionedThroughputExceededException errors into Kinesis API responses.
KINESIS_SHARD_LIMIT100 (default), Infinity (to disable)Integer value , causing the Kinesis API to start throwing exceptions to mimic the default shard limit.
KINESIS_ON_DEMAND_STREAM_COUNT_LIMIT10 (default), Infinity (to disable)Integer value , causing the Kinesis API to start throwing exceptions to mimic the default on demand stream count limit.
KINESIS_LATENCY500 (default), 0 (to disable)Integer value of milliseconds, causing the Kinesis API to delay returning a response in order to mimic latency from a live AWS call.


VariableExample ValuesDescription
BUCKET_MARKER_LOCALhot-reload (default)Magic S3 bucket name for Hot Reloading. The S3Key points to the source code on the local file system.
HOSTNAME_FROM_LAMBDAlocalstackEndpoint host under which APIs are accessible from Lambda containers (optional). This can be useful in docker-compose stacks to use the local container hostname if neither IP address nor container name of the main container are available (e.g., in CI). Often used in combination with LAMBDA_DOCKER_NETWORK.
LAMBDA_DISABLE_AWS_ENDPOINT_URL0 (default) | 1Whether to disable injecting the environment variable AWS_ENDPOINT_URL, which automatically configures supported AWS SDKs.
LAMBDA_DISABLE_JAVA_SDK_V2_CERTIFICATE_VALIDATION1 (default)Whether to disable the certificate name validation for AWS Java SDK v2 calls when using transparent endpoint injection.
LAMBDA_DOCKER_DNS"" (default)Optional custom DNS server for the container running your Lambda function. Overwrites the default LocalStack DNS Server. Hence, resolving requires additional configuration.
LAMBDA_DOCKER_FLAGS-e KEY=VALUE, -v host:container, -p host:container, --add-host domain:ipAdditional flags passed to Docker run|create commands. Supports environment variables (also with --env-file, but the file has to be mounted into the LocalStack container), ports, volume mounts, extra hosts, networks, DNS servers, labels, ulimits, user, platform, and privileged mode. The --env-file argument for Docker run and Docker Compose have different feature sets. To provide both, we support the --env-file for environment files with the docker run syntax, while --compose-env-file supports the full docker compose features, like placeholders with ${}, replacing quotes, etc.
LAMBDA_DOCKER_NETWORKbridge (Docker default)Docker network driver for the Lambda and ECS containers. Needs to be set to the network the LocalStack container is connected to. Limitation: host mode currently not supported.
LAMBDA_DOWNLOAD_AWS_LAYERS1 (default, pro)Whether to download public Lambda layers from AWS through a LocalStack proxy when creating or updating functions.
LAMBDA_IGNORE_ARCHITECTURE0 (default)Whether to ignore the AWS architectures (x86_64 or arm64) configured for the lambda function. Set to 1 to run cross-platform compatible lambda functions natively (i.e., Docker selects architecture).
LAMBDA_K8S_IMAGE_PREFIXamazon/aws-lambda- (default, pro)Prefix for images that will be used to execute Lambda functions in Kubernetes.
LAMBDA_K8S_INIT_IMAGESpecify the image for downloading the init binary from LocalStack. The image must include the curl and chmod commands. This is only relevant for container-based Lambdas on Kubernetes
LAMBDA_KEEPALIVE_MS600000 (default 10min)Time in milliseconds until lambda shuts down the execution environment after the last invocation has been processed. Set to 0 to immediately shut down the execution environment after an invocation.
LAMBDA_LIMITS_CONCURRENT_EXECUTIONS1000 (default)The maximum number of events that functions can process simultaneously in the current Region. See AWS service quotas
LAMBDA_LIMITS_CODE_SIZE_ZIPPED52428800 (default)The maximum zip file size in bytes for the CreateFunction operation. Raising this limit enables the creation of larger Lambda functions without the need to upload the code to an S3 deployment bucket.
LAMBDA_LIMITS_CREATE_FUNCTION_REQUEST_SIZE70167211 (default)The maximum HTTP request size in bytes for the CreateFunction operation. Raising this limit enables larger HTTP requests including zipped file size.
LAMBDA_LIMITS_MAX_FUNCTION_ENVVAR_SIZE_BYTES4096 (default)The maximum size of the environment variables that you can use to configure your function.
LAMBDA_REMOVE_CONTAINERS1 (default)Whether to remove any Lambda Docker containers.
LAMBDA_RUNTIME_ENVIRONMENT_TIMEOUT20 (default)How many seconds Lambda will wait for the runtime environment to start up. Increase this timeout if I/O is slow or your Lambda deployments are large or contain many files.
LAMBDA_RUNTIME_EXECUTORdocker (default)Where Lambdas will be executed.
kubernetes (pro)Execute lambdas in a Kubernetes cluster.
LAMBDA_RUNTIME_IMAGE_MAPPINGbase images for Lambda (default)Customize the Docker image of Lambda runtimes, either by:
a) pattern with <runtime> placeholder, e.g. custom-repo/lambda-<runtime>:2022
b) json dict mapping the <runtime> to an image, e.g. {"python3.9": "custom-repo/lambda-py:thon3.9"}
LAMBDA_RUNTIME_VALIDATION0 (default)Set to 1 to enforce strict AWS parity by raising an exception when using a deprecated Lambda runtime for the API operation CreateFunction. Deprecated Lambda runtimes (e.g., nodejs14.x) can be used with disabled validation (current default).
LAMBDA_SYNCHRONOUS_CREATE0 (default)Set to 1 to create lambda functions synchronously (not recommended).
LAMBDA_TRUNCATE_STDOUT2000 (default)Allows increasing the default char limit for truncation of lambda log lines when printed in the console. This does not affect the logs processing in CloudWatch.


VariableExample ValuesDescription
REDIS_CONTAINER_MODE1|0 (default)Start MemoryDB cluster nodes in separate containers instead of in the LocalStack container


VariableExample ValuesDescription,files.pythonhosted.orgComma-separated list of hosts for which SSL verification is not performed when installing Python dependencies for MWAA environment.
MWAA_S3_POLL_INTERVAL30 (default)Interval in seconds with which MWAA polls S3 bucket to check for new or updated assets.


VariableExample ValuesDescription
NEPTUNE_DB_TYPEneo4j|tinkerpop (default)Starts Neptune DB as traditional netpune with Tinkerpop/Gremlin (default) or in Neo4J mode.
NEPTUNE_ENABLE_TRANSACTION1|0 (default)Enables Gremlin transaction. This is an experimental feature, see notes
NEPTUNE_GREMLIN_DEBUG1|0 (default)Enable Gremlin logs
NEPTUNE_USE_SSL1|0 (default)Whether to start the Neptune server with SSL configuration, which will enable wss protocol. This setting is only valid for Tinkerpop/Gremlin. By default SSL is not enabled.


VariableExample ValuesDescription
OPENSEARCH_CUSTOM_BACKENDhttp://opensearch:9200URL to a custom OpenSearch backend cluster. If this is set to a valid URL, then LocalStack will not create OpenSearch cluster instances, but instead forward all domains to the given backend (see Custom Opensearch Backends).
OPENSEARCH_MULTI_CLUSTER1| 0When activated, LocalStack will spawn one OpenSearch cluster per domain. Otherwise all domains will share a single cluster instance. This is ignored if OPENSEARCH_CUSTOM_BACKEND is set.
OPENSEARCH_ENDPOINT_STRATEGYpath|domain|portGoverns how domain endpoints are created to access a cluster (see Opensearch Endpoints).
SKIP_INFRA_DOWNLOADS1 | 0 (default)Deprecated since 1.3.0 Whether to skip downloading additional infrastructure components (e.g., specific Elasticsearch versions)


VariableExample ValuesDescription
RDS_CLUSTER_ENDPOINT_HOST_ONLY1 (default) | 0Whether the cluster endpoint returns the host only (which is AWS parity). If set to 0 it will return <host>:<port>.
RDS_PG_CUSTOM_VERSIONS0 | 1 (default)Whether to install and use custom Postgres versions for RDS (or alternatively, use default version 11).
RDS_MYSQL_DOCKER1 (default) | 0Whether to disable MySQL engines (and use MariaDB instead). MySQL engine for cluster/instances will start in a new docker container. If you have troubles running MySQL in docker, you can disable the feature.
MYSQL_IMAGEmysql:8.0Defines a specific MySQL image that should be used when spinning up the MySQL engine. Only available if RDS_MYSQL_DOCKER is enabled. a specific image that should be used when spinning up a SQL server engine.


VariableExample ValuesDescription
S3_DIRDeprecated since 3.0.0 This is only supported for the legacy_v2 provider. Configure a global parent directory that contains all buckets as sub-directories (S3_DIR=/path/to/root) or an individual directory that will get mounted as special bucket names (S3_DIR=/path/to/root/bucket1:bucket1). Only available for Localstack Pro.
S3_SKIP_SIGNATURE_VALIDATION0 | 1 (default)Used to toggle validation of S3 pre-signed URL request signature. Set to 0 to validate. Note that validation can only pass if the AWS_SECRET_ACCESS_KEY is set to test or if using credentials returned from STS.AssumeRole
S3_SKIP_KMS_KEY_VALIDATION0 | 1 (default)Used to toggle validation of provided KMS key in S3 operations.
PROVIDER_OVERRIDE_S3legacy_v2 | v3 (default)The new LocalStack-native S3 provider (v3) is active by default since LocalStack 3.0.


VariableExample ValuesDescription
PROVIDER_OVERRIDE_STEPFUNCTIONSlegacy | v2 (default)The new LocalStack-native StepFunctions provider (v2) is active by default since LocalStack 3.0.
STEPFUNCTIONS_LAMBDA_ENDPOINTdefaultDeprecated since 3.0.0 This is only supported for the legacy provider. URL to use as the Lambda service endpoint in Step Functions. By default this is the LocalStack Lambda endpoint. Use default to select the original AWS Lambda endpoint.
Removed in new provider.


VariableExample ValuesDescription
SQS_DELAY_PURGE_RETRY0 (default)Used to toggle PurgeQueueInProgress errors when making more than one PurgeQueue call within 60 seconds.
SQS_DELAY_RECENTLY_DELETED0 (default)Used to toggle QueueDeletedRecently errors when re-creating a queue within 60 seconds of deleting it.
SQS_ENABLE_MESSAGE_RETENTION_PERIOD0 (default) | 1Used to toggle the MessageRetentionPeriod feature (see Enabling MessageRetentionPeriod
SQS_ENDPOINT_STRATEGYstandard (default) | domain | path | offConfigures the format of Queue URLs (see SQS Queue URLs
SQS_DISABLE_CLOUDWATCH_METRICS0 (default)Disables the CloudWatch Metrics for SQS when set to 1
SQS_CLOUDWATCH_METRICS_REPORT_INTERVAL60 (default)Configures the report interval (in seconds) for Approximate* metrics that are sent to CloudWatch periodically. Sending will be disabled if SQS_DISABLE_CLOUDWATCH_METRICS=1


VariableExample ValuesDescription
DISABLE_CORS_HEADERS0 (default)Whether to disable the returning of default CORS headers in API responses (disables access from
DISABLE_CORS_CHECKS0 (default)Whether to disable all CSRF (server-side) mitigations.
DISABLE_CUSTOM_CORS_S30 (default)Whether to disable CORS override by S3.
DISABLE_CUSTOM_CORS_APIGATEWAY0 (default)Whether to disable CORS override by apigateway.
EXTRA_CORS_ALLOWED_ORIGINSComma-separated list of origins that are allowed to communicate with localstack.
EXTRA_CORS_ALLOWED_HEADERSComma-separated list of header names to be be added to Access-Control-Allow-Headers CORS header.
EXTRA_CORS_EXPOSE_HEADERSComma-separated list of header names to be be added to Access-Control-Expose-Headers CORS header.
ENABLE_CONFIG_UPDATES0 (default)Whether to enable dynamic configuration updates at runtime.


Please check with your SMTP email service provider for the following settings.

VariableExample ValuesDescription
SMTP_HOSTlocalhost:1025Hostname (and optionally the port) of the SMTP server. The port defaults to 25.
SMTP_USERLogin username for the SMTP server if required.
SMTP_PASSLogin password for the SMTP server if required.
SMTP_EMAILsender@example.comOrigin email address. Required for Cognito only.


To learn more about these configuration options, see Persistence.

VariableValid optionsDescription
SNAPSHOT_SAVE_STRATEGYON_SHUTDOWN|ON_REQUEST|SCHEDULED|MANUALStrategy that governs when LocalStack should make state snapshots
SNAPSHOT_LOAD_STRATEGYON_STARTUP|ON_REQUEST|MANUALStrategy that governs when LocalStack restores state snapshots
SNAPSHOT_FLUSH_INTERVAL15 (default)The interval (in seconds) between persistence snapshots. It only applies to a SCHEDULED save strategy (see Persistence Mechanism)

Cloud Pods

To learn more about these configuration options, see Cloud Pods.

VariableValid optionsDescription
AUTO_LOAD_PODComma-separated list of Cloud Pods to be automatically loaded at startup time. This feature is disabled when snapshot persistence is set via the PERSISTENCE variable.
POD_LOAD_CLI_TIMEOUT60 (default)Timeout in seconds to wait before returning from load operations on the Cloud Pods CLI
POD_ENCRYPTION0 (default) | 1Whether to encrypt the Cloud Pods artifacts at rest.


VariableExample ValuesDescription
EXTENSION_AUTO_INSTALLInstall a list of extensions automatically at startup. Comma-separated list of extensions directives which will be installed automatically at startup (see managing extensions)
EXTENSION_DEV_MODE0 (default) | 1Enables development mode for extensions. Refer to the Extensions Development Guide for more information.


VariableExample ValuesDescription
EVENT_RULE_ENGINEpython (default) | java (preview)Engine for event pattern matching used in EventBridge, EventBridge Pipes, and Lambda Event Source Mapping. Set it java to use the AWS event-ruler offering better parity.
SKIP_SSL_CERT_DOWNLOADWhether to skip downloading the SSL certificate for
CUSTOM_SSL_CERT_PATH/var/lib/localstack/custom/server.test.pemDefines the absolute path to a custom SSL certificate for
IGNORE_ES_DOWNLOAD_ERRORSWhether to ignore errors (e.g., network/SSL) when downloading Elasticsearch plugins
OVERRIDE_IN_DOCKEROverrides the check whether LocalStack is executed within a docker container. If set to true, LocalStack assumes it runs in a docker container. Should not be set unless necessary.
DISABLE_EVENTS1Whether to disable publishing LocalStack events
OUTBOUND_HTTP_PROXYhttp:// Proxy used for downloads of runtime dependencies and connections outside LocalStack itself
OUTBOUND_HTTPS_PROXYhttps:// Proxy used for downloads of runtime dependencies and connections outside LocalStack itself
REQUESTS_CA_BUNDLE/var/lib/localstack/lib/ca_bundle.pemCA Bundle to be used to verify HTTPS requests made by LocalStack
DOCKER_HOSTunix:///var/run/docker.sock (default)Daemon socket to connect Docker. Used by the LocalStack dependency Docker.


VariableExample ValuesDescription
DEVELOPStarts a debugpy server before starting LocalStack services
DEVELOP_PORTPort number for debugpy server
WAIT_FOR_DEBUGGERForces LocalStack to wait for a debugger to start the services


To learn more about these configuration options, see DNS Server.

VariableExample ValuesDescription
DNS_ADDRESS0.0.0.0 (default)Address the LocalStack should bind the DNS server on (port 53 tcp/udp). Value 0 to disable.
DNS_SERVERDefault upstream DNS or (default)Fallback DNS server for queries not handled by LocalStack.
DNS_RESOLVE_IP127.0.0.1 (default)IP address the DNS server should return as A record for queries handled by LocalStack. If customized, this value will be returned in preference to the DNS server response.
DNS_NAME_PATTERNS_TO_RESOLVE_UPSTREAM([^.]+\.)*(ecr|lambda)\.[^.]+\.amazonaws\.com (example)List of domain names that should NOT be redirected by the LocalStack DNS to the LocalStack container, but instead always forwarded to the upstream resolver. This will NOT redirect requests made to LocalStack due to manual endpoint configuration. Comma-separated list of Python-flavored regex patterns. See the DNS server documentation for more details.
DNS_LOCAL_NAME_PATTERNS([^.]+\.)*(ecr|lambda)\.[^.]+\.amazonaws\.com (example)Deprecated since 3.0.2 List of domain names that should NOT be redirected by the LocalStack DNS to the LocalStack container, but instead always forwarded to the upstream resolver. This will NOT redirect requests made to LocalStack due to manual endpoint configuration. Comma-separated list of Python-flavored regex patterns. Renamed to DNS_NAME_PATTERNS_TO_RESOLVE_UPSTREAM

Transparent Endpoint Injection

VariableExample ValuesDescription
DISABLE_TRANSPARENT_ENDPOINT_INJECTION0 (default in Pro) | 1Whether to disable DNS resolution of AWS hostnames to the LocalStack container. Pro feature. (see Transparent Endpoint Injection)

LocalStack Pro

VariableExample ValuesDescription
ACTIVATE_PRO0 | 1ย (default)Whether Pro should be activated or not. This is set to true by default if using the localstack/localstack-pro container image. If set to 1, LocalStack will fail to start if the license key activation did not work. If set to 0, an attempt is made to start LocalStack without Pro features.
LOCALSTACK_AUTH_TOKENAuth token to activate LocalStack Pro.
LOCALSTACK_API_KEYDeprecated since 3.0.0 API key to activate LocalStack Pro.
Use the LOCALSTACK_AUTH_TOKEN instead (except for CI environments).
LOG_LICENSE_ISSUES0 | 1ย (default)Whether to log issues with the license activation to the console.


These configurations have already been removed and won’t have any effect on newer versions of LocalStack. Please remove them from your configuration.

VariableRemoved inExample ValuesDescription
<SERVICE>_BACKEND3.0.0http://localhost:7577Custom endpoint URL to use for a specific service, where <SERVICE> is the uppercase service name.
<SERVICE>_PORT_EXTERNAL3.0.04567Port number to expose a specific service externally . SQS_PORT_EXTERNAL, e.g. , is used when returning queue URLs from the SQS service to the client.
ACTIVATE_NEW_POD_CLIENT3.0.00|1 (default)Whether to use the new Cloud Pods client leveraging LocalStack container’s APIs.
BIGDATA_MONO_CONTAINER3.0.00|1 (default)Whether to spin Big Data services inside the LocalStack main container. Glue jobs breaks when using BIGDATA_MONO_CONTAINER=0.
DEFAULT_REGION3.0.0us-east-1 (default)AWS region to use when talking to the API (needs to be activated via USE_SINGLE_REGION=1). LocalStack now has full multi-region support.
EDGE_BIND_HOST3.0.0127.0.0.1 (default), (docker)Address the edge service binds to. Use GATEWAY_LISTEN instead.
EDGE_FORWARD_URL3.0.0http:// target URL to forward all edge requests to (e.g., for distributed deployments)
EDGE_PORT3.0.04566 (default)Port number for the edge service, the main entry point for all API invocations.
EDGE_PORT_HTTP3.0.04566 (default)Port number for the edge service, the main entry point for all API invocations.
ES_CUSTOM_BACKEND3.0.0http://elasticsearch:9200Use OPENSEARCH_CUSTOM_BACKEND instead. URL to a custom elasticsearch backend cluster. If this is set to a valid URL, then LocalStack will not create elasticsearch cluster instances, but instead forward all domains to the given backend (see Custom Elasticsearch Backends).
ES_ENDPOINT_STRATEGY3.0.0path|domain|port (formerly off)Use OPENSEARCH_ENDPOINT_STRATEGY instead. Governs how domain endpoints are created to access a cluster (see Elasticsearch Endpoints)
ES_MULTI_CLUSTER3.0.00|1Use OPENSEARCH_MULTI_CLUSTER instead. When activated, LocalStack will spawn one Elasticsearch cluster per domain. Otherwise all domains will share a single cluster instance. This is ignored if ES_CUSTOM_BACKEND is set.
HOSTNAME_EXTERNAL3.0.0localhost (default)Name of the host to expose the services externally. This host is used, e.g., when returning queue URLs from the SQS service to the client. Use LOCALSTACK_HOST instead.
KINESIS_INITIALIZE_STREAMS3.0.0"my-first-stream:1,my-other-stream:2:us-west-2,my-last-stream:1"A comma-delimited string of stream names, its corresponding shard count and an optional region to initialize during startup. If the region is not provided, the default region is used. Only works with the kinesis-mock KINESIS_PROVIDER.
KINESIS_PROVIDER3.0.0kinesis-mock (default) and kinesalite
KMS_PROVIDER3.0.0moto (default), local-kmslocal-kms has been removed.
LAMBDA_CODE_EXTRACT_TIME3.0.025 (default)Time in seconds to wait at max while extracting Lambda code. By default, it is 25 seconds for limiting the execution time to avoid client/network timeout issues.
Removed in new provider because function creation happens asynchronously.
LAMBDA_CONTAINER_REGISTRY3.0.0lambci/lambda (default)An alternative docker registry from where to pull lambda execution containers.
Replaced by LAMBDA_RUNTIME_IMAGE_MAPPING in new provider.
LAMBDA_EXECUTOR3.0.0Method to use for executing Lambda functions. 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). More information in Lambda Executor Modes.
Removed in new provider. Mount the Docker socket or see migration guide.
docker (default)Run each function invocation in a separate Docker container.
local (fallback)Run Lambda functions in a temporary directory on the local machine.
docker-reuseCreate one Docker container per function and reuse it across invocations.
LAMBDA_FALLBACK_URL3.0.0Fallback 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)://...).
Removed in new provider.
LAMBDA_FORWARD_URL3.0.0URL used to forward all Lambda invocations (useful to run Lambdas via an external service).
Removed in new provider.
LAMBDA_JAVA_OPTS3.0.0-Xmx512MAllow passing custom JVM options to Java Lambdas executed in Docker. Use _debug_port_ placeholder to configure the debug port, e.g., -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=_debug_port_.
Currently not supported in new provider but possible via custom entrypoint.
LAMBDA_REMOTE_DOCKER3.0.0determines whether Lambda code is copied or mounted into containers.
Removed in new provider because zip file copying is used by default and hot reloading automatically configures mounting.
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.
falseyour 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_STAY_OPEN_MODE3.0.01 (default)Usage of the stay-open mode of Lambda containers. Only applicable if LAMBDA_EXECUTOR=docker-reuse. Set to 0 if you want to use Hot Reloading.
Removed in new provider because stay-open mode is the default behavior. LAMBDA_KEEPALIVE_MS can be used to configure how long containers should be kept running in-between invocations.
LAMBDA_XRAY_INIT3.0.01 | 0 (default)Whether to fully initialize XRay daemon for Lambda containers (may increase Lambda startup times).
the X-Ray daemon is now always initialized.
LEGACY_EDGE_PROXY3.0.01 | 0 (default)Whether to use the legacy edge proxy or the newer Gateway/HandlerChain framework.
LOCALSTACK_HOSTNAME3.0.0http://${LOCALSTACK_HOSTNAME}:4566Name of the host where LocalStack services are available. Use this hostname as endpoint in order to access the services from within your Lambda functions (e.g., to store an item to DynamoDB or S3 from a Lambda). This option is read-only. Use LOCALSTACK_HOST instead.
MOCK_UNIMPLEMENTED3.0.01 | 0 (default)Whether to return mocked success responses (instead of 501 errors) for currently unimplemented API methods
PERSIST_ALL3.0.0true (default)Whether to persist all resources (including user code like Lambda functions), or only “light-weight” resources (e.g., SQS queues, or Cognito users). Can be set to false to reduce storage size of DATA_DIR folders or Cloud Pods.
SYNCHRONOUS_KINESIS_EVENTS3.0.01 (default) | 0Whether or not to handle Kinesis Lambda event sources as synchronous invocations.
USE_SINGLE_REGION3.0.01 | 0 (default)Whether to use the legacy single-region mode, defined via DEFAULT_REGION.
DATA_DIR2.0.0blank (disabled/default), /tmp/localstack/dataLocal directory for saving persistent data. Use PERSISTENCE instead.
DISABLE_TERM_HANDLER2.0.0"" (default) | 1Whether to disable signal passing to LocalStack when running in docker. Enabling this will prevent an orderly shutdown when running inside LS in docker. Setting this to anything else than an empty string will disable it.
HOST_TMP_FOLDER2.0.0/some/pathTemporary folder on the host that gets mounted as $TMPDIR/localstack into the LocalStack container. Required only for Lambda volume mounts when using LAMBDA_REMOTE_DOCKER=false.
INIT_SCRIPTS_PATH2.0.0/some/pathBefore 1.0, this was used to configure the path to the initializing files with extensions .sh that were found in /docker-entrypoint-initaws.d. This has been replaced by the init-hook system.
LEGACY_DIRECTORIES2.0.00 (default)Use legacy method of managing internal filesystem layout. See Filesystem Layout.
LEGACY_INIT_DIR2.0.01 | 0(default)Used with INIT_SCRIPTS_PATH. This has been replaced by the init-hook system.
MULTI_ACCOUNTS2.0.00 (default)Enable multi-accounts (preview)
SQS_PROVIDER2.0.0moto (default) and elasticmq
SYNCHRONOUS_API_GATEWAY_EVENTS2.0.01 (default) | 0Whether or not to handle API Gateway Lambda event sources as synchronous invocations.
SYNCHRONOUS_DYNAMODB_EVENTS2.0.01 (default) | 0Whether or not to handle DynamoDB Lambda event sources as synchronous invocations.
SYNCHRONOUS_SQS_EVENTS2.0.01 | 0 (default)Whether or not to handle SQS Lambda event sources as synchronous invocations.
SYNCHRONOUS_SNS_EVENTS2.0.01 | 0 (default)Whether or not to handle SNS Lambda event sources as synchronous invocations.
TMPDIR2.0.0/tmp (default)Temporary folder on the host running the CLI and inside the LocalStack container .
USE_LIGHT_IMAGE2.0.01 (default)Whether to use the light-weight Docker image. Overwritten by IMAGE_NAME.
LEGACY_PERSISTENCE1.0.0true (default)Whether to enable legacy persistence mechanism based on API calls record & replay. Only relevant for Community image, not relevant for advanced persistence mechanism in Pro.
PERSISTENCE_SINGLE_FILE1.0.0true (default)Specify if persistence files should be combined (only relevant for legacy persistence in Community image, not relevant for advanced persistence in Pro version).
PORT_WEB_UI0.12.88080 (default)Port for the legacy Web UI. Replaced by our Web Application


LocalStack supports configuration profiles which are stored in the ~/.localstack config directory. A configuration profile is a set of environment variables stored in an .env file in the LocalStack config directory.

Here is an example of what configuration profiles might look like:

$ tree ~/.localstack
โ”œโ”€โ”€ default.env
โ”œโ”€โ”€ dev.env
โ””โ”€โ”€ pro.env

Here is an example of what a specific environment profile looks like

$ cat ~/.localstack/pro-debug.env

You can load a profile by either setting the env variable CONFIG_PROFILE=<profile> or the --profile=<profile> CLI flag when using the CLI. Let’s take an example to load the dev.env profile file if it exists:

$ python -m localstack.cli.main --profile=dev start

If no profile is specified, the default.env profile will be loaded. While explicitly specified, the environment variables will always overwrite the profile.

To display the config environment variables, you can use the following command:

$ python -m localstack.cli.main --profile=dev config show
Last modified July 18, 2024: setup markdownlint (#1382) (f2ebb421e)