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AWS S3 Sink

The Vector aws_s3 sink sends logs to AWS S3.

Configuration

[sinks.my_sink_id]
  # General
  type = "aws_s3" # required
  inputs = ["my-source-or-transform-id", "prefix-*"] # required
  bucket = "my-bucket" # required
  compression = "gzip" # optional, default
  region = "us-east-1" # required, required when endpoint = null


  # Batch
  batch.max_bytes = 10000000 # optional, default, bytes
  batch.timeout_secs = 300 # optional, default, seconds


  # Encoding
  encoding.codec = "ndjson" # required


  # File Naming
  key_prefix = "date=%F/" # optional, default


  # Healthcheck
  healthcheck.enabled = true # optional, default
25 items
  • enumoptionalstring

    acl

    Canned ACL to apply to the created objects. For more information, see Canned ACL. See Object Access Control List (ACL) for more info.

    • Syntax: literal
    • Enum, must be one of: "private" "public-read" "public-read-write" "aws-exec-read" "authenticated-read" "bucket-owner-read" "bucket-owner-full-control" "log-delivery-write"
    • View examples
  • optionaltable

    auth

    Options for the authentication strategy.

    • optionalstring

      access_key_id

      The AWS access key id. Used for AWS authentication when communicating with AWS services. See AWS Authentication for more info.

      • Syntax: literal
      • View examples
    • optionalstring

      assume_role

      The ARN of an IAM role to assume at startup. See AWS Authentication for more info.

      • Syntax: literal
      • View examples
    • optionalstring

      secret_access_key

      The AWS secret access key. Used for AWS authentication when communicating with AWS services. See AWS Authentication for more info.

      • Syntax: literal
      • View examples
  • commonoptionaltable

    batch

    Configures the sink batching behavior.

    • commonoptionaluint

      max_bytes

      The maximum size of a batch, in bytes, before it is flushed.

      • Default: 10000000 (bytes)
    • commonoptionaluint

      timeout_secs

      The maximum age of a batch before it is flushed. See Buffers & batches for more info.

      • Default: 300 (seconds)
  • commonrequiredstring

    bucket

    The S3 bucket name. Do not include a leading s3:// or a trailing /.

    • Syntax: literal
    • View examples
  • optionaltable

    buffer

    Configures the sink specific buffer behavior.

    • commonoptionaluint

      max_events

      The maximum number of events allowed in the buffer. See Buffers & batches for more info.

      • Only relevant when: type = "memory"
      • Default: 500 (events)
    • commonrequired*uint

      max_size

      The maximum size of the buffer on the disk. See Buffers & batches for more info.

      • Only required when: type = "disk"
      • View examples
    • enumcommonoptionalstring

      type

      The buffer's type and storage mechanism.

      • Syntax: literal
      • Default: "memory"
      • Enum, must be one of: "memory" "disk"
      • View examples
    • enumoptionalstring

      when_full

      The behavior when the buffer becomes full.

      • Syntax: literal
      • Default: "block"
      • Enum, must be one of: "block" "drop_newest"
      • View examples
  • enumcommonoptionalstring

    compression

    The compression strategy used to compress the encoded event data before transmission.

    • Syntax: literal
    • Default: "gzip"
    • Enum, must be one of: "none" "gzip" "syntax"
    • View examples
  • optionalstring

    content_encoding

    Specifies what content encodings have been applied to the object and thus what decoding mechanisms must be applied to obtain the media-type referenced by the Content-Type header field. By default calculated from compression value.

    • Syntax: literal
    • View examples
  • optionalstring

    content_type

    A standard MIME type describing the format of the contents.

    • Syntax: literal
    • Default: "text/x-log"
  • commonrequiredtable

    encoding

    Configures the encoding specific sink behavior.

    • commonrequiredstring

      codec

      The encoding codec used to serialize the events before outputting.

      • Syntax: literal
      • View examples
    • optional[string]

      except_fields

      Prevent the sink from encoding the specified labels.

      • View examples
    • optional[string]

      only_fields

      Prevent the sink from encoding the specified labels.

      • View examples
    • enumoptionalstring

      timestamp_format

      How to format event timestamps.

      • Syntax: literal
      • Default: "rfc3339"
      • Enum, must be one of: "rfc3339" "unix"
      • View examples
  • optionalstring

    endpoint

    Custom endpoint for use with AWS-compatible services. Providing a value for this option will make region moot.

    • Syntax: literal
    • Only relevant when: region = null
    • View examples
  • optionalbool

    filename_append_uuid

    Whether or not to append a UUID v4 token to the end of the file. This ensures there are no name collisions high volume use cases. See Object naming for more info.

    • Default: true
    • View examples
  • optionalstring

    filename_extension

    The filename extension to use in the object name.

    • Syntax: literal
    • Default: "log"
  • optionalstring

    filename_time_format

    The format of the resulting object file name. strftime specifiers are supported. See Object naming for more info.

    This field supports strftime formatting, which enables dynamic values based on the value of the timestamp field.

    • Syntax: strftime
    • Default: "%s"
  • optionalstring

    grant_full_control

    Gives the named grantee READ, READ_ACP, and WRITE_ACP permissions on the created objects. See Cross account object writing and Object Access Control List (ACL) for more info.

    • Syntax: literal
    • View examples
  • optionalstring

    grant_read

    Allows the named grantee to read the created objects and their metadata. See Object Access Control List (ACL) for more info.

    • Syntax: literal
    • View examples
  • optionalstring

    grant_read_acp

    Allows the named grantee to read the created objects' ACL. See Object Access Control List (ACL) for more info.

    • Syntax: literal
    • View examples
  • optionalstring

    grant_write_acp

    Allows the named grantee to write the created objects' ACL. See Object Access Control List (ACL) for more info.

    • Syntax: literal
    • View examples
  • commonoptionaltable

    healthcheck

    Health check options for the sink. See Health checks for more info.

    • commonoptionalbool

      enabled

      Enables/disables the healthcheck upon Vector boot.

      • Default: true
      • View examples
  • commonoptionalstring

    key_prefix

    A prefix to apply to all object key names. This should be used to partition your objects, and it's important to end this value with a / if you want this to be the root S3 "folder". See Object naming for more info.

    This field supports Vector's template syntax, which enables the use of dynamic per-event values.

    • Syntax: template
    • Default: "date=%F/"
    • View examples
  • commonrequired*string

    region

    The AWS region of the target service. If endpoint is provided it will override this value since the endpoint includes the region.

    • Syntax: literal
    • Only required when: endpoint = null
    • View examples
  • optionaltable

    request

    Configures the sink request behavior.

    • optionaltable

      adaptive_concurrency

      Configure the adaptive concurrency algorithms. These values have been tuned by optimizing simulated results. In general you should not need to adjust these.

      • optionalfloat
        decrease_ratio

        The fraction of the current value to set the new concurrency limit when decreasing the limit. Valid values are greater than 0 and less than 1. Smaller values cause the algorithm to scale back rapidly when latency increases. Note that the new limit is rounded down after applying this ratio.

        • Default: 0.9
      • optionalfloat
        ewma_alpha

        The adaptive concurrency algorithm uses an exponentially weighted moving average (EWMA) of past RTT measurements as a reference to compare with the current RTT. This value controls how heavily new measurements are weighted compared to older ones. Valid values are greater than 0 and less than 1. Smaller values cause this reference to adjust more slowly, which may be useful if a service has unusually high response variability.

        • Default: 0.7
      • optionalfloat
        rtt_threshold_ratio

        When comparing the past RTT average to the current measurements, we ignore changes that are less than this ratio higher than the past RTT. Valid values are greater than or equal to 0. Larger values cause the algorithm to ignore larger increases in the RTT.

        • Default: 0.05
    • commonoptionaluint

      concurrency

      The maximum number of in-flight requests allowed at any given time, or "adaptive" to allow Vector to automatically set the limit based on current network and service conditions.

      • Default: 50 (requests)
    • commonoptionaluint

      rate_limit_duration_secs

      The time window, in seconds, used for the rate_limit_num option.

      • Default: 1 (seconds)
    • commonoptionaluint

      rate_limit_num

      The maximum number of requests allowed within the rate_limit_duration_secs time window.

      • Default: 250
    • optionaluint

      retry_attempts

      The maximum number of retries to make for failed requests. The default, for all intents and purposes, represents an infinite number of retries.

      • Default: 18446744073709552000
    • optionaluint

      retry_initial_backoff_secs

      The amount of time to wait before attempting the first retry for a failed request. Once, the first retry has failed the fibonacci sequence will be used to select future backoffs.

      • Default: 1 (seconds)
    • optionaluint

      retry_max_duration_secs

      The maximum amount of time, in seconds, to wait between retries.

      • Default: 10 (seconds)
    • commonoptionaluint

      timeout_secs

      The maximum time a request can take before being aborted. It is highly recommended that you do not lower this value below the service's internal timeout, as this could create orphaned requests, pile on retries, and result in duplicate data downstream. See Buffers & batches for more info.

      • Default: 30 (seconds)
  • enumoptionalstring

    server_side_encryption

    The Server-side Encryption algorithm used when storing these objects. See Server-Side Encryption (SSE) for more info.

    • Syntax: literal
    • Enum, must be one of: "AES256" "aws:kms"
    • View examples
  • optionalstring

    ssekms_key_id

    If server_side_encryption has the value "aws.kms", this specifies the ID of the AWS Key Management Service (AWS KMS) symmetrical customer managed customer master key (CMK) that will used for the created objects. If not specified, Amazon S3 uses the AWS managed CMK in AWS to protect the data.

    • Syntax: literal
    • View examples
  • enumoptionalstring

    storage_class

    The storage class for the created objects. See the S3 Storage Classes for more details. See Storage class for more info.

    • Syntax: literal
    • Enum, must be one of: "STANDARD" "REDUCED_REDUNDANCY" "INTELLIGENT_TIERING" "STANDARD_IA" "ONEZONE_IA" "GLACIER" "DEEP_ARCHIVE"
    • View examples
  • optionaltable

    tags

    The tag-set for the object.

Env Vars

9 items
  • commonoptionalstring

    AWS_ACCESS_KEY_ID

    The AWS access key id. Used for AWS authentication when communicating with AWS services. See AWS Authentication for more info.

    • Syntax: literal
    • View examples
  • commonoptionalstring

    AWS_CONFIG_FILE

    Specifies the location of the file that the AWS CLI uses to store configuration profiles.

    • Syntax: literal
    • Default: "~/.aws/config"
  • commonoptionalstring

    AWS_CREDENTIAL_EXPIRATION

    Expiration time in RFC 3339 format. If unset, credentials won't expire.

    • Syntax: literal
    • View examples
  • commonoptionalstring

    AWS_DEFAULT_REGION

    The default AWS region.

    • Syntax: literal
    • Only relevant when: endpoint = null
    • View examples
  • commonoptionalstring

    AWS_PROFILE

    Specifies the name of the CLI profile with the credentials and options to use. This can be the name of a profile stored in a credentials or config file.

    • Syntax: literal
    • Default: "default"
    • View examples
  • commonoptionalstring

    AWS_ROLE_SESSION_NAME

    Specifies a name to associate with the role session. This value appears in CloudTrail logs for commands performed by the user of this profile.

    • Syntax: literal
    • View examples
  • commonoptionalstring

    AWS_SECRET_ACCESS_KEY

    The AWS secret access key. Used for AWS authentication when communicating with AWS services. See AWS Authentication for more info.

    • Syntax: literal
    • View examples
  • commonoptionalstring

    AWS_SESSION_TOKEN

    The AWS session token. Used for AWS authentication when communicating with AWS services.

    • Syntax: literal
    • View examples
  • commonoptionalstring

    AWS_SHARED_CREDENTIALS_FILE

    Specifies the location of the file that the AWS CLI uses to store access keys.

    • Syntax: literal
    • Default: "~/.aws/credentials"

Telemetry

This component provides the following metrics that can be retrieved through the internal_metrics source. See the metrics section in the monitoring page for more info.

  • counter

    events_in_total

    The total number of events accepted by this component. This metric includes the following tags:

    • component_kind - The Vector component kind.

    • component_name - The Vector component ID.

    • component_type - The Vector component type.

    • instance - The Vector instance identified by host and port.

    • job - The name of the job producing Vector metrics.

  • counter

    events_out_total

    The total number of events emitted by this component. This metric includes the following tags:

    • component_kind - The Vector component kind.

    • component_name - The Vector component ID.

    • component_type - The Vector component type.

    • instance - The Vector instance identified by host and port.

    • job - The name of the job producing Vector metrics.

How It Works

AWS Authentication

Vector checks for AWS credentials in the following order:

  1. Options access_key_id and secret_access_key.
  2. Environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.
  3. The credential_process command in the AWS config file. (usually located at ~/.aws/config)
  4. The AWS credentials file. (usually located at ~/.aws/credentials)
  5. The IAM instance profile. (will only work if running on an EC2 instance with an instance profile/role)

If credentials are not found the healtcheck will fail and an error will be logged.

Obtaining an access key

In general, we recommend using instance profiles/roles whenever possible. In cases where this is not possible you can generate an AWS access key for any user within your AWS account. AWS provides a detailed guide on how to do this. Such created AWS access keys can be used via access_key_id and secret_access_key options.

Assuming roles

Vector can assume an AWS IAM role via the assume_role option. This is an optional setting that is helpful for a variety of use cases, such as cross account access.

Buffers & batches

This component buffers & batches data as shown in the diagram above. You'll notice that Vector treats these concepts differently, instead of treating them as global concepts, Vector treats them as sink specific concepts. This isolates sinks, ensuring services disruptions are contained and delivery guarantees are honored.

Batches are flushed when 1 of 2 conditions are met:

  1. The batch age meets or exceeds the configured timeout_secs.
  2. The batch size meets or exceeds the configured <% if component.options.batch.children.respond_to?(:max_size) %>max_size<% else %>max_events<% end %>.

Buffers are controlled via the buffer.* options.

Cross account object writing

If you're using Vector to write objects across AWS accounts then you should consider setting the grant_full_control option to the bucket owner's canonical user ID. AWS provides a full tutorial for this use case. If don't know the bucket owner's canonical ID you can find it by following this tutorial.

Health checks

Health checks ensure that the downstream service is accessible and ready to accept data. This check is performed upon sink initialization. If the health check fails an error will be logged and Vector will proceed to start.

Require health checks

If you'd like to exit immediately upon a health check failure, you can pass the --require-healthy flag:

vector --config /etc/vector/vector.toml --require-healthy

Disable health checks

If you'd like to disable health checks for this sink you can set the healthcheck option to false.

Object Access Control List (ACL)

AWS S3 supports access control lists (ACL) for buckets and objects. In the context of Vector, only object ACLs are relevant (Vector does not create or modify buckets). You can set the object level ACL by using one of the acl, grant_full_control, grant_read, grant_read_acp, or grant_write_acp options.

acl.* options

The grant_* options name a specific entity to grant access to. The acl options is one of a set of specific canned ACLs that can only name the owner or world.

Object Tags & metadata

Vector currently only supports AWS S3 object tags and does not support object metadata. If you require metadata support see issue #1694.

We believe tags are more flexible since they are separate from the actual S3 object. You can freely modify tags without modifying the object. Conversely, object metadata requires a full rewrite of the object to make changes.

Object naming

By default, Vector will name your S3 objects in the following format:

<key_prefix><timestamp>-<uuidv4>.log

For example:

date=2019-06-18/1560886634-fddd7a0e-fad9-4f7e-9bce-00ae5debc563.log

Vector appends a UUIDV4 token to ensure there are no name conflicts in the unlikely event 2 Vector instances are writing data at the same time.

You can control the resulting name via the key_prefix, filename_time_format, and filename_append_uuid options.

Partitioning

Vector supports dynamic configuration values through a simple template syntax. If an option supports templating, it will be noted with a badge and you can use event fields to create dynamic values. For example:

vector.toml
[sinks.my-sink]
    dynamic_option = "application={{ application_id }}"

In the above example, the application_id for each event will be used to partition outgoing data.

Rate limits & adapative concurrency

Adaptive Request Concurrency (ARC)

Adaptive Requst Concurrency is a feature of Vector that does away with static rate limits and automatically optimizes HTTP concurrency limits based on downstream service responses. The underlying mechanism is a feedback loop inspired by TCP congestion control algorithms. Checkout the announcement blog post,

We highly recommend enabling this feature as it improves performance and reliability of Vector and the systems it communicates with.

To enable, set the request.concurrency option to adaptive:

vector.toml
[sinks.my-sink]
  request.concurrency = "adaptive"

Static rate limits

If Adaptive Request Concurrency is not for you, you can manually set static rate limits with the request.rate_limit_duration_secs, request.rate_limit_num, and request.concurrency options:

vector.toml
[sinks.my-sink]
  request.rate_limit_duration_secs = 1
  request.rate_limit_num = 10
  request.concurrency = 10

Retry policy

Vector will retry failed requests (status == 429, >= 500, and != 501). Other responses will not be retried. You can control the number of retry attempts and backoff rate with the request.retry_attempts and request.retry_backoff_secs options.

Server-Side Encryption (SSE)

AWS S3 offers server-side encryption. You can apply defaults at the bucket level or set the encryption at the object level. In the context, of Vector only the object level is relevant (Vector does not create or modify buckets). Although, we recommend setting defaults at the bucket level whne possible. You can explicitly set the object level encryption via the server_side_encryption option.

State

This component is stateless, meaning its behavior is consistent across each input.

Storage class

AWS S3 offers storage classes. You can apply defaults, and rules, at the bucket level or set the storage class at the object level. In the context of Vector only the object level is relevant (Vector does not create or modify buckets). You can set the storage class via the storage_class option.

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