.. _es-guide-reference-modules-gateway-s3:

==
S3
==

s3 based gateway allows to do long term reliable async persistency of the cluster state and indices directly to Amazon s3. Here is how it can be configured:


.. code-block:: js


    cloud:
        aws:
            access_key: AKVAIQBF2RECL7FJWGJQ
            secret_key: vExyMThREXeRMm/b/LRzEB8jWwvzQeXgjqMX+6br
    
    
    gateway:
        type: s3
        s3:
            bucket: bucket_name


The following are a list of settings (prefixed with **gateway.s3**) that can further control the s3 gateway:


================  ============================================================================================================================
 Setting           Description                                                                                                                
================  ============================================================================================================================
**chunk_size**    Big files are broken down into chunks (to overcome AWS 5g limit and use concurrent snapshotting). Default set to **100m**.  
================  ============================================================================================================================

concurrent_streams
==================

The **gateway.s3.concurrent_streams** allow to throttle the number of streams (per node) opened against the shared gateway performing the snapshot operation. It defaults to **5**.


Region
======

The **cloud.aws.region** can be set to a region and will automatically use the relevant settings for both **ec2** and **s3**. The available values are: **us-east-1**, **us-west-1**, **ap-southeast-1**, **eu-west-1**.