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Code Editor : s3-config.rst
:title: AWS CLI S3 Configuration :description: Advanced configuration for AWS S3 Commands :category: S3 :related command: s3 cp, s3 sync, s3 mv, s3 rm The ``aws s3`` transfer commands, which include the ``cp``, ``sync``, ``mv``, and ``rm`` commands, have additional configuration values you can use to control S3 transfers. This topic guide discusses these parameters as well as best practices and guidelines for setting these values. Before discussing the specifics of these values, note that these values are entirely optional. You should be able to use the ``aws s3`` transfer commands without having to configure any of these values. These configuration values are provided in the case where you need to modify one of these values, either for performance reasons or to account for the specific environment where these ``aws s3`` commands are being run. Configuration Values ==================== These are the configuration values you can set specifically for the ``aws s3`` command set: * ``max_concurrent_requests`` - The maximum number of concurrent requests. * ``max_queue_size`` - The maximum number of tasks in the task queue. * ``multipart_threshold`` - The size threshold the CLI uses for multipart transfers of individual files. * ``multipart_chunksize`` - When using multipart transfers, this is the chunk size that the CLI uses for multipart transfers of individual files. * ``max_bandwidth`` - The maximum bandwidth that will be consumed for uploading and downloading data to and from Amazon S3. These are the configuration values that can be set for both ``aws s3`` and ``aws s3api``: * ``use_accelerate_endpoint`` - Use the Amazon S3 Accelerate endpoint for all ``s3`` and ``s3api`` commands. You **must** first enable S3 Accelerate on your bucket before attempting to use the endpoint. This is mutually exclusive with the ``use_dualstack_endpoint`` option. * ``use_dualstack_endpoint`` - Use the Amazon S3 dual IPv4 / IPv6 endpoint for all ``s3 `` and ``s3api`` commands. This is mutually exclusive with the ``use_accelerate_endpoint`` option. * ``addressing_style`` - Specifies which addressing style to use. This controls if the bucket name is in the hostname or part of the URL. Value values are: ``path``, ``virtual``, and ``auto``. The default value is ``auto``. * ``payload_signing_enabled`` - Refers to whether or not to SHA256 sign sigv4 payloads. By default, this is disabled for streaming uploads (UploadPart and PutObject) when using https. These values must be set under the top level ``s3`` key in the AWS Config File, which has a default location of ``~/.aws/config``. Below is an example configuration:: [profile development] aws_access_key_id=foo aws_secret_access_key=bar s3 = max_concurrent_requests = 20 max_queue_size = 10000 multipart_threshold = 64MB multipart_chunksize = 16MB max_bandwidth = 50MB/s use_accelerate_endpoint = true addressing_style = path Note that all the S3 configuration values are indented and nested under the top level ``s3`` key. You can also set these values programmatically using the ``aws configure set`` command. For example, to set the above values for the default profile, you could instead run these commands:: $ aws configure set default.s3.max_concurrent_requests 20 $ aws configure set default.s3.max_queue_size 10000 $ aws configure set default.s3.multipart_threshold 64MB $ aws configure set default.s3.multipart_chunksize 16MB $ aws configure set default.s3.max_bandwidth 50MB/s $ aws configure set default.s3.use_accelerate_endpoint true $ aws configure set default.s3.addressing_style path To programmatically set these values for a profile other than the default profile the ``--profile`` flag can be provided. For example, to set configuration for a profile named ``test-profile`` you could run a command like this one:: $ aws configure set s3.max_concurrent_requests 20 --profile test-profile max_concurrent_requests ----------------------- **Default** - ``10`` The ``aws s3`` transfer commands are multithreaded. At any given time, multiple requests to Amazon S3 are in flight. For example, if you are uploading a directory via ``aws s3 cp localdir s3://bucket/ --recursive``, the AWS CLI could be uploading the local files ``localdir/file1``, ``localdir/file2``, and ``localdir/file3`` in parallel. The ``max_concurrent_requests`` specifies the maximum number of transfer commands that are allowed at any given time. You may need to change this value for a few reasons: * Decreasing this value - On some environments, the default of 10 concurrent requests can overwhelm a system. This may cause connection timeouts or slow the responsiveness of the system. Lowering this value will make the S3 transfer commands less resource intensive. The tradeoff is that S3 transfers may take longer to complete. Lowering this value may be necessary if using a tool such as ``trickle`` to limit bandwidth. * Increasing this value - In some scenarios, you may want the S3 transfers to complete as quickly as possible, using as much network bandwidth as necessary. In this scenario, the default number of concurrent requests may not be sufficient to utilize all the network bandwidth available. Increasing this value may improve the time it takes to complete an S3 transfer. max_queue_size -------------- **Default** - ``1000`` The AWS CLI internally uses a producer consumer model, where we queue up S3 tasks that are then executed by consumers, which in this case utilize a bound thread pool, controlled by ``max_concurrent_requests``. A task generally maps to a single S3 operation. For example, as task could be a ``PutObjectTask``, or a ``GetObjectTask``, or an ``UploadPartTask``. The enqueuing rate can be much faster than the rate at which consumers are executing tasks. To avoid unbounded growth, the task queue size is capped to a specific size. This configuration value changes the value of that maximum number. You generally will not need to change this value. This value also corresponds to the number of tasks we are aware of that need to be executed. This means that by default we can only see 1000 tasks ahead. Until the S3 command knows the total number of tasks executed, the progress line will show a total of ``...``. Increasing this value means that we will be able to more quickly know the total number of tasks needed, assuming that the enqueuing rate is quicker than the rate of task consumption. The tradeoff is that a larger max queue size will require more memory. multipart_threshold ------------------- **Default** - ``8MB`` When uploading, downloading, or copying a file, the S3 commands will switch to multipart operations if the file reaches a given size threshold. The ``multipart_threshold`` controls this value. You can specify this value in one of two ways: * The file size in bytes. For example, ``1048576``. * The file size with a size suffix. You can use ``KB``, ``MB``, ``GB``, ``TB``. For example: ``10MB``, ``1GB``. Note that S3 imposes constraints on valid values that can be used for multipart operations. multipart_chunksize ------------------- **Default** - ``8MB`` **Minimum For Uploads** - ``5MB`` Once the S3 commands have decided to use multipart operations, the file is divided into chunks. This configuration option specifies what the chunk size (also referred to as the part size) should be. This value can specified using the same semantics as ``multipart_threshold``, that is either as the number of bytes as an integer, or using a size suffix. max_bandwidth ------------- **Default** - None This controls the maximum bandwidth that the S3 commands will utilize when streaming content data to and from S3. Thus, this value only applies for uploads and downloads. It does not apply to copies nor deletes because those data transfers take place server side. The value is in terms of **bytes** per second. The value can be specified as: * An integer. For example, ``1048576`` would set the maximum bandwidth usage to 1 MB per second. * A rate suffix. You can specify rate suffixes using: ``KB/s``, ``MB/s``, ``GB/s``, etc. For example: ``300KB/s``, ``10MB/s``. In general, it is recommended to first use ``max_concurrent_requests`` to lower transfers to the desired bandwidth consumption. The ``max_bandwidth`` setting should then be used to further limit bandwidth consumption if setting ``max_concurrent_requests`` is unable to lower bandwidth consumption to the desired rate. This is recommended because ``max_concurrent_requests`` controls how many threads are currently running. So if a high ``max_concurrent_requests`` value is set and a low ``max_bandwidth`` value is set, it may result in threads having to wait unnecessarily which can lead to excess resource consumption and connection timeouts. use_accelerate_endpoint ----------------------- **Default** - ``false`` If set to ``true``, will direct all Amazon S3 requests to the S3 Accelerate endpoint: ``s3-accelerate.amazonaws.com``. To use this endpoint, your bucket must be enabled to use S3 Accelerate. All request will be sent using the virtual style of bucket addressing: ``my-bucket.s3-accelerate.amazonaws.com``. Any ``ListBuckets``, ``CreateBucket``, and ``DeleteBucket`` requests will not be sent to the Accelerate endpoint as the endpoint does not support those operations. This behavior can also be set if ``--endpoint-url`` parameter is set to ``https://s3-accelerate.amazonaws.com`` or ``http://s3-accelerate.amazonaws.com`` for any ``s3`` or ``s3api`` command. This option is mutually exclusive with the ``use_dualstack_endpoint`` option. use_dualstack_endpoint ---------------------- **Default** - ``false`` If set to ``true``, will direct all Amazon S3 requests to the dual IPv4 / IPv6 endpoint for the configured region. This option is mutually exclusive with the ``use_accelerate_endpoint`` option. addressing_style ---------------- **Default** - ``auto`` There's two styles of constructing an S3 endpoint. The first is with the bucket included as part of the hostname. This corresponds to the addressing style of ``virtual``. The second is with the bucket included as part of the path of the URI, corresponding to the addressing style of ``path``. The default value in the CLI is to use ``auto``, which will attempt to use ``virtual`` where possible, but will fall back to ``path`` style if necessary. For example, if your bucket name is not DNS compatible, the bucket name cannot be part of the hostname and must be in the path. With ``auto``, the CLI will detect this condition and automatically switch to ``path`` style for you. If you set the addressing style to ``path``, you must ensure that the AWS region you configured in the AWS CLI matches the same region of your bucket. payload_signing_enabled ----------------------- If set to ``true``, s3 payloads will receive additional content validation in the form of a SHA256 checksum which will be calculated for you and included in the request signature. If set to ``false``, the checksum will not be calculated. Disabling this can be useful to save the performance overhead that the checksum calculation would otherwise cause. By default, this is disabled for streaming uploads (UploadPart and PutObject), but only if a ContentMD5 is present (it is generated by default) and the endpoint uses HTTPS.
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