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AWS Cost Exporter

Build Status Go Report Card

An easy to use and highly customizable Prometheus exporter for AWS Cost and Usage Reports

Project status: alpha. All planned features are completed.

Homepage

Example

Deployment

Report delivery to S3 bucket should be configured prior deployment.

Examples below use following shell variables:

export AWS_ACCESS_KEY_ID=your-key
export AWS_SECRET_ACCESS_KEY=your-secret-key
export AWS_REGION=us-east-1

report_bucket=your-bucket-name
report_name=your-report-name

Deploy with Docker:

docker run --rm \
    -p 127.0.0.1:9100:9100 \
    -e AWS_ACCESS_KEY_ID \
    -e AWS_SECRET_ACCESS_KEY \
    -e AWS_REGION \
    st8ed/aws-cost-exporter \
    --bucket $report_bucket --report $report_name

Deploy with Helm (preferred):

helm repo add aws-cost-exporter https://st8ed.github.io/aws-cost-exporter/
helm repo update

# Note: prefer to use -f values.yaml because commandline arguments
# are considered insecure (exposed systemwide)
helm install \
    aws-cost-exporter aws-cost-exporter/aws-cost-exporter \
    --set "aws.access_key_id=$AWS_ACCESS_KEY_ID" \
    --set "aws.secret_access_key=$AWS_SECRET_ACCESS_KEY" \
    --set "aws.region=$AWS_REGION" \
    --set "aws.bucket=$report_bucket" \
    --set "aws.report=$report_name"

Deploy locally:

aws-cost-exporter \
    --bucket $report_bucket \
    --report $report_name

Usage

Exported metrics are labelled according to SQL query, which itself is configurable. See original column descriptions for details.

usage: aws-cost-exporter --bucket=BUCKET --report=REPORT [<flags>]

Flags:
  -h, --help               Show context-sensitive help (also try --help-long and
                           --help-man).
      --bucket=BUCKET      Name of the S3 bucket with detailed billing report(s)
      --report=REPORT      Name of the AWS detailed billing report in supplied
                           S3 bucket
      --repository="/var/lib/aws-cost-exporter/repository"
                           Path to store cached AWS billing reports
      --queries-dir="/etc/aws-cost-exporter/queries"
                           Path to directory with SQL queries for gathering
                           metrics
      --state-path="/var/lib/aws-cost-exporter/state.json"
                           Path to store exporter state
      --web.listen-address=":9100"
                           Address on which to expose metrics and web interface.
      --web.telemetry-path="/metrics"
                           Path under which to expose metrics.
      --web.disable-exporter-metrics
                           Exclude metrics about the exporter itself
                           (promhttp_*, process_*, go_*).
      --web.config=""      [EXPERIMENTAL] Path to config yaml file that can
                           enable TLS or authentication.
      --log.level=info     Only log messages with the given severity or above.
                           One of: [debug, info, warn, error]
      --log.format=logfmt  Output format of log messages. One of: [logfmt, json]
      --version            Show application version.

Setup AWS

Create a Cost and Usage report following official instructions. Alternatively you can setup AWS resources using AWS CLI. Some configuration values are necessary for the exporter to work:

  • Report data integration must be disabled, so reports are gzipped csv files
  • "Hourly" or "Daily" time granularity
  • Minimal prefix is chosen (/)

You also need to setup proper IAM user with read access to S3 bucket.

Setup AWS with AWS CLI

Equivalently you can create a report using AWS CLI (see aws cur put-report-definition). An example of suitable report definition:

{
    "ReportDefinitions": [
        {
            "ReportName": "your-report-name",
            "TimeUnit": "HOURLY",
            "Format": "textORcsv",
            "Compression": "GZIP",
            "AdditionalSchemaElements": [
                "RESOURCES"
            ],
            "S3Bucket": "your-bucket-name",
            "S3Prefix": "/",
            "S3Region": "us-east-1",
            "AdditionalArtifacts": [],
            "RefreshClosedReports": false,
            "ReportVersioning": "CREATE_NEW_REPORT"
        }
    ]
}

How it works

Internally the exporter analyzes AWS CUR Manifest file in S3 bucket and locally synchronizes most recent CSV report file. The synchronized files are stored indefinitely in path specified in --repository.

On each scrape, a HEAD request is performed to check if AWS CUR Manifest is updated. After synchronization, a SQL query using csvq is ran. The query result is exported as metrics with metric_ prefix marking the columns to export.

How to build

Nix is used for fully reproducible build.

# Build docker image
nix build .#dockerImage

# Build chart
nix build .#helmChart

Alternatives

Most publicly available alternatives use AWS Cost Explorer API, which costs money for each API request. AWS Cost and Usage Reports is free, only a very small fee is charged for S3 usage.