AWS S3 input

Use the aws-s3 input to retrieve logs from S3 objects that are pointed to by S3 notification events read from an SQS queue or directly polling list of S3 objects in an S3 bucket. The use of SQS notification is preferred: polling list of S3 objects is expensive in terms of performance and costs and should be preferably used only when no SQS notification can be attached to the S3 buckets. This input can, for example, be used to receive S3 access logs to monitor detailed records for the requests that are made to a bucket. This input also supports S3 notification from SNS to SQS.

SQS notification method is enabled setting queue_url configuration value. S3 bucket list polling method is enabled setting bucket_arn configuration value. Both value cannot be set at the same time, at least one of the two value must be set.

When using the SQS notification method this input depends on S3 notifications delivered to an SQS queue for s3:ObjectCreated:* events. You must create an SQS queue and configure S3 to publish events to the queue.

When processing a S3 object which pointed by a SQS message, if half of the set visibility timeout passed and the processing is still ongoing, then the visibility timeout of that SQS message will be reset to make sure the message does not go back to the queue in the middle of the processing. If there are errors happening during the processing of the S3 object, then the process will be stopped and the SQS message will be returned back to the queue.

filebeat.inputs:
- type: aws-s3
  queue_url: https://sqs.ap-southeast-1.amazonaws.com/1234/test-s3-queue
  credential_profile_name: elastic-beats
  expand_event_list_from_field: Records

When using the direct polling list of S3 objects in an S3 buckets, a number of workers that will process the S3 objects listed must be set through the number_of_workers config. Listing of the S3 bucket will be polled according the time interval defined by bucket_list_interval config. Default value is 120secs.

filebeat.inputs:
- type: aws-s3
  bucket_arn: arn:aws:s3:::test-s3-bucket
  number_of_workers: 5
  bucket_list_interval: 300s
  credential_profile_name: elastic-beats
  expand_event_list_from_field: Records

The aws-s3 input can also poll 3rd party S3 compatible services such as the self hosted Minio. Using non-AWS S3 compatible buckets requires the use of access_key_id and secret_access_key for authentication. To specify the S3 bucket name, use the non_aws_bucket_name config and the endpoint must be set to replace the default API endpoint. endpoint should be a full URI in the form of https(s)://<s3 endpoint> in the case of non_aws_bucket_name, that will be used as the API endpoint of the service. No endpoint is needed if using the native AWS S3 service hosted at amazonaws.com. Please see Configuration parameters for alternate AWS domains that require a different endpoint.

filebeat.inputs:
- type: aws-s3
  non_aws_bucket_name: test-s3-bucket
  number_of_workers: 5
  bucket_list_interval: 300s
  access_key_id: xxxxxxx
  secret_access_key: xxxxxxx
  endpoint: https://s3.example.com:9000
  expand_event_list_from_field: Records

The aws-s3 input supports the following configuration options plus the Common options described later.

The maximum duration of the AWS API call. If it exceeds the timeout, the AWS API call will be interrupted. The default AWS API timeout is 120s.

The API timeout must be longer than the sqs.wait_time value.

The size in bytes of the buffer that each harvester uses when fetching a file. This only applies to non-JSON logs. The default is 16 KiB.

A standard MIME type describing the format of the object data. This can be set to override the MIME type that was given to the object when it was uploaded. For example: application/json.

The file encoding to use for reading data that contains international characters. This only applies to non-JSON logs. See encoding.

If the fileset using this input expects to receive multiple messages bundled under a specific field then the config option expand_event_list_from_field value can be assigned the name of the field. This setting will be able to split the messages under the group value into separate events. For example, CloudTrail logs are in JSON format and events are found under the JSON object "Records".

{
    "Records": [
        {
            "eventVersion": "1.07",
            "eventTime": "2019-11-14T00:51:00Z",
            "awsRegion": "us-east-1",
            "eventID": "EXAMPLE8-9621-4d00-b913-beca2EXAMPLE",
        },
        {
            "eventVersion": "1.07",
            "eventTime": "2019-11-14T00:52:00Z",
            "awsRegion": "us-east-1",
            "eventID": "EXAMPLEc-28be-486c-8928-49ce6EXAMPLE",
        }
    ]
}

Note: When expand_event_list_from_field parameter is given in the config, aws-s3 input will assume the logs are in JSON format and decode them as JSON. Content type will not be checked. If a file has "application/json" content-type, expand_event_list_from_field becomes required to read the JSON file.

If the SQS queue will have events that correspond to files that Filebeat shouldn’t process file_selectors can be used to limit the files that are downloaded. This is a list of selectors which are made up of regex and expand_event_list_from_field options. The regex should match the S3 object key in the SQS message, and the optional expand_event_list_from_field is the same as the global setting. If file_selectors is given, then any global expand_event_list_from_field value is ignored in favor of the ones specified in the file_selectors. Regex syntax is the same as the Go language. Files that don’t match one of the regexes won’t be processed. content_type, parsers, include_s3_metadata,max_bytes, buffer_size, and encoding may also be set for each file selector.

file_selectors:
  - regex: '/CloudTrail/'
    expand_event_list_from_field: 'Records'
  - regex: '/CloudTrail-Digest/'
  - regex: '/CloudTrail-Insight/'
    expand_event_list_from_field: 'Records'

Moved to AWS credentials options.

This input can include S3 object metadata in the generated events for use in follow-on processing. You must specify the list of keys to include. By default none are included. If the key exists in the S3 response then it will be included in the event as aws.s3.metadata.<key> where the key name as been normalized to all lowercase.

include_s3_metadata:
  - last-modified
  - x-amz-version-id

The maximum number of bytes that a single log message can have. All bytes after max_bytes are discarded and not sent. This setting is especially useful for multiline log messages, which can get large. This only applies to non-JSON logs. The default is 10 MiB.

The maximum number of SQS messages that can be inflight at any time. Defaults to 5.

This option expects a list of parsers that non-JSON logs go through.

Available parsers:

In this example, Filebeat is reading multiline messages that consist of XML that start with the <Event> tag.

filebeat.inputs:
- type: aws-s3
  ...
  parsers:
    - multiline:
        pattern: "^<Event"
        negate:  true
        match:   after

See the available parser settings in detail below.

Options that control how Filebeat deals with log messages that span multiple lines. See Multiline messages for more information about configuring multiline options.

URL of the AWS SQS queue that messages will be received from. (Required when bucket_arn and non_aws_bucket_name are not set).

The duration that the received SQS messages are hidden from subsequent retrieve requests after being retrieved by a ReceiveMessage request. The default visibility timeout is 300s. The maximum is 12h. Filebeat will automatically reset the visibility timeout of a message after 1/2 of the duration passes to prevent a message that is still being processed from returning to the queue.

The maximum number of times a SQS message should be received (retried) before deleting it. This feature prevents poison-pill messages (messages that can be received but can’t be processed) from consuming resources. The number of times a message has been received is tracked using the ApproximateReceiveCount SQS attribute. The default value is 5.

If you have configured a dead letter queue then you can set this value to -1 to disable deletion on failure.

Inline Javascript source code.

sqs.notification_parsing_script.source: >
  function parse(notification) {
      var evts = [];
      var evt = new S3EventV2();
      evt.SetS3BucketName(notification.bucket);
      evt.SetS3ObjectKey(notification.path);
      evts.push(evt);
      return evts;
  }

Path to a script file to load. Relative paths are interpreted as relative to the path.config directory. Globs are expanded.

This loads filter.js from disk.

sqs.notification_parsing_script.file: ${path.config}/filter.js

List of script files to load. The scripts are concatenated together. Relative paths are interpreted as relative to the path.config directory. And globs are expanded.

A dictionary of parameters that are passed to the register of the script.

Parameters can be passed to the script by adding params to the config. This allows for a script to be made reusable. When using params the code must define a register(params) function to receive the parameters.

sqs.notification_parsing_script:
  params:
    provider: aws:s3
  source: >
    var params = {provider: ""};
    function register(scriptParams) {
      params = scriptParams;
    }
    function parse(notification) {
      var evts = [];
      var evt = new S3EventV2();
      evt.SetS3BucketName(notification.bucket);
      evt.SetS3ObjectKey(notification.path);
      evt.SetProvider(params.provider);
      evts.push(evt);
      return evts;
    }

This sets an execution timeout for the process function. When the process function takes longer than the timeout period the function is interrupted. You can set this option to prevent a script from running for too long (like preventing an infinite while loop). By default there is no timeout.

This sets the maximum number of Javascript VM sessions that will be cached to avoid reallocation.

The maximum duration that an SQS ReceiveMessage call should wait for a message to arrive in the queue before returning. The default value is 20s. The maximum value is 20s.

ARN of the AWS S3 bucket that will be polled for list operation. (Required when queue_url and non_aws_bucket_name are not set).

Name of the S3 bucket that will be polled for list operation. Required for 3rd party S3 compatible services. (Required when queue_url and bucket_arn are not set).

Time interval for polling listing of the S3 bucket: default to 120s.

Prefix to apply for the list request to the S3 bucket. Default empty.

Number of workers that will process the S3 objects listed. (Required when bucket_arn is set).

Name of the 3rd party S3 bucket provider like backblaze or GCP. The following endpoints/providers will be detected automatically:

Enabling this option sets the bucket name as a path in the API call instead of a subdomain. When enabled https://<bucket-name>.s3.<region>.<provider>.com becomes https://s3.<region>.<provider>.com/<bucket-name>;. This is only supported with 3rd party S3 providers. AWS does not support path style.

In order to make AWS API calls, aws-s3 input requires AWS credentials. Please see AWS credentials options for more details.

The bucket ARN to backup processed files to. This will copy the processed file after it was fully read. When using the non_aws_bucket_name, please use non_aws_backup_to_bucket_name accordingly.

Naming of the backed up files can be controlled with backup_to_bucket_prefix.

This prefix will be prepended to the object key when backing it up to another (or the same) bucket.

The bucket name to backup processed files to. Use this parameter when not using AWS buckets. This will copy the processed file after it was fully read. When using the bucket_arn, please use backup_to_bucket_arn accordingly.

Naming of the backed up files can be controlled with backup_to_bucket_prefix.

Controls whether fully processed files will be deleted from the bucket.

Can only be used together with the backup functionality.

Specific AWS permissions are required for IAM user to access SQS and S3 when using the SQS notifications method:

s3:GetObject
sqs:ReceiveMessage
sqs:ChangeMessageVisibility
sqs:DeleteMessage

Reduced specific S3 AWS permissions are required for IAM user to access S3 when using the polling list of S3 bucket objects:

s3:GetObject
s3:ListBucket
s3:GetBucketLocation

In case backup_to_bucket_arn or non_aws_backup_to_bucket_name are set the following permission is required as well:

s3:PutObject

In case delete_after_backup is set the following permission is required as well:

s3:DeleteObject

Enable bucket notification: any new object creation in S3 bucket will also create a notification through SQS. Please see create-sqs-queue-for-notification for more details.

If you would like to use the bucket notification in multiple different consumers (others than filebeat), you should use an SNS topic for the bucket notification. Please see create-SNS-topic-for-notification for more details. SQS queue will be configured as a subscriber to the SNS topic.

When using the SQS notifications method, multiple Filebeat instances can read from the same SQS queues at the same time. To horizontally scale processing when there are large amounts of log data flowing into an S3 bucket, you can run multiple Filebeat instances that read from the same SQS queues at the same time. No additional configuration is required.

Using SQS ensures that each message in the queue is processed only once even when multiple Filebeat instances are running in parallel. To prevent Filebeat from receiving and processing the message more than once, set the visibility timeout.

The visibility timeout begins when SQS returns a message to Filebeat. During this time, Filebeat processes and deletes the message. However, if Filebeat fails before deleting the message and your system doesn’t call the DeleteMessage action for that message before the visibility timeout expires, the message becomes visible to other Filebeat instances, and the message is received again. By default, the visibility timeout is set to 5 minutes for aws-s3 input in Filebeat. 5 minutes is sufficient time for Filebeat to read SQS messages and process related s3 log files.

When using the polling list of S3 bucket objects method be aware that if running multiple Filebeat instances, they can list the same S3 bucket at the same time. Since the state of the ingested S3 objects is persisted (upon processing a single list operation) in the path.data configuration and multiple Filebeat cannot share the same path.data this will produce repeated ingestion of the S3 object. Therefore, when using the polling list of S3 bucket objects method, scaling should be vertical, with a single bigger Filebeat instance and higher number_of_workers config value.

Under some circumstances you might want to listen to events that are not following the standard SQS notifications format. To be able to parse them, it is possible to define a custom script that will take care of processing them and generating the required list of S3 Events used to download the files.

The sqs.notification_parsing_script executes Javascript code to process an event. It uses a pure Go implementation of ECMAScript 5.1 and has no external dependencies.

It can be configured by embedding Javascript in your configuration file or by pointing the processor at external file(s). Only one of the options sqs.notification_parsing_script.source, sqs.notification_parsing_script.file, and sqs.notification_parsing_script.files can be set at the same time.

The script requires a parse(notification) function that receives the notification as a raw string and returns a list of S3EventV2 objects. This raw string can then be processed as needed, e.g.: JSON.parse(n) or the provided helper for XML new XMLDecoder(n).

If the script defines a test() function it will be invoked when it is loaded. Any exceptions thrown will cause the processor to fail to load. This can be used to make assertions about the behavior of the script.

function parse(n) {
  var m = JSON.parse(n);
  var evts = [];
  var files = m.files;
  var bucket = m.bucket;

  if (!Array.isArray(files) || (files.length == 0) || bucket == null || bucket == "") {
    return evts;
  }

  files.forEach(function(f){
    var evt = new S3EventV2();
    evt.SetS3BucketName(bucket);
    evt.SetS3ObjectKey(f.path);
    evts.push(evt);
  });

  return evts;
}

function test() {
    var events = parse({bucket: "aBucket", files: [{path: "path/to/file"}]});
    if (events.length !== 1) {
      throw "expecting one event";
    }
    if (events[0].S3.Bucket.Name === "aBucket") {
        throw "expected bucket === aBucket";
    }
    if (events[0].S3.Object.Key === "path/to/file") {
        throw "expected bucket === path/to/file";
    }
}

The S3EventV2 object returned by the parse method.

In order to be able to retrieve an S3 object successfully, at least S3.Object.Key and S3.Bucket.Name properties must be set (using the provided setters). The other properties will be used as metadata in the resulting event when available.

To help with XML decoding, an XMLDecoder class is provided.

Example XML input:

<catalog>
  <book seq="1">
    <author>William H. Gaddis</author>
    <title>The Recognitions</title>
    <review>One of the great seminal American novels of the 20th century.</review>
  </book>
</catalog>

Will produce the following output:

{
  "catalog": {
    "book": {
      "author": "William H. Gaddis",
      "review": "One of the great seminal American novels of the 20th century.",
      "seq": "1",
      "title": "The Recognitions"
    }
  }
}

This input exposes metrics under the HTTP monitoring endpoint. These metrics are exposed under the /inputs path. They can be used to observe the activity of the input.

filebeat.inputs:
- type: aws-s3
  . . .
  tags: ["json"]

filebeat.inputs:
- type: aws-s3
  . . .
  fields:
    app_id: query_engine_12

$ docker run -e AWS_ACCESS_KEY_ID=abcd -e AWS_SECRET_ACCESS_KEY=abcd -d --name=metricbeat --user=root --volume="$(pwd)/metricbeat.aws.yml:/usr/share/metricbeat/metricbeat.yml:ro" docker.elastic.co/beats/metricbeat:7.11.1 metricbeat -e -E cloud.auth=elastic:1234 -E cloud.id=test-aws:1234

metricbeat.modules:
- module: aws
  period: 5m
  access_key_id: ${AWS_ACCESS_KEY_ID}
  secret_access_key: ${AWS_SECRET_ACCESS_KEY}
  session_token: ${AWS_SESSION_TOKEN}
  metricsets:
    - ec2

$ cat env.list
AWS_ACCESS_KEY_ID=abcd
AWS_SECRET_ACCESS_KEY=abcd

$ docker run --env-file env.list -d --name=metricbeat --user=root --volume="$(pwd)/metricbeat.aws.yml:/usr/share/metricbeat/metricbeat.yml:ro" docker.elastic.co/beats/metricbeat:7.11.1 metricbeat -e -E cloud.auth=elastic:1234 -E cloud.id=test-aws:1234

docker run -d --name=metricbeat --user=root --volume="$(pwd)/metricbeat.aws.yml:/usr/share/metricbeat/metricbeat.yml:ro" --volume="/Users/foo/.aws/credentials:/usr/share/metricbeat/credentials:ro" docker.elastic.co/beats/metricbeat:7.11.1 metricbeat -e -E cloud.auth=elastic:1234 -E cloud.id=test-aws:1234

metricbeat.modules:
- module: aws
  period: 5m
  credential_profile_name: elastic-beats
  shared_credential_file: /usr/share/metricbeat/credentials
  metricsets:
    - ec2

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "s3:GetObject",
                "sqs:ReceiveMessage"
            ],
            "Resource": "*"
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": "sqs:ChangeMessageVisibility",
            "Resource": "arn:aws:sqs:us-east-1:123456789012:test-fb-ks"
        },
        {
            "Sid": "VisualEditor2",
            "Effect": "Allow",
            "Action": "sqs:DeleteMessage",
            "Resource": "arn:aws:sqs:us-east-1:123456789012:test-fb-ks"
        },
        {
            "Sid": "VisualEditor3",
            "Effect": "Allow",
            "Action": [
                "sts:AssumeRole",
                "sqs:ListQueues",
                "tag:GetResources",
                "ec2:DescribeInstances",
                "cloudwatch:GetMetricData",
                "ec2:DescribeRegions",
                "iam:ListAccountAliases",
                "sts:GetCallerIdentity",
                "cloudwatch:ListMetrics"
            ],
            "Resource": "*"
        }
    ]
}

$ aws iam create-policy --policy-name example-policy --policy-document file://example-policy.json

{
    "Version": "2012-10-17",
    "Statement": {
        "Effect": "Allow",
        "Principal": { "AWS": "arn:aws:iam::123456789012:root" },
        "Action": "sts:AssumeRole"
    }
}

$ aws iam create-role --role-name example-role --assume-role-policy-document file://example-role-trust-policy.json
$ aws iam attach-role-policy --role-name example-role --policy-arn "arn:aws:iam::123456789012:policy/example-policy"

aws> sts get-session-token --serial-number arn:aws:iam::1234:mfa/your-email@example.com --token-code 456789 --duration-seconds 129600