README.md

Using AWS S3 logging to gather metrics

This repo contains a terraform file and a single-pixel transparent gif. You can use it to get approximate cookie-less usage metrics out of any web application that refernces the publicly exposed pixel.gif.

loggingbucket.tf

variable "logging_bucket" {
    default = "logging.mvtango"
}
variable "log_bucket" {
    default = "logs.mvtango"
}
variable "region" {
    default = "eu-west-1"
}
variable "logging_grantee" {
    default = "arn:aws:iam::858827067514:root"
}



resource "aws_s3_bucket" "logging_bucket" {
    bucket = "${var.logging_bucket}"
    acl = "public-read"
    policy = <<eof
{
  "Version":"2012-10-17",
  "Statement":[
    {
      "Sid":"AddPerm",
      "Effect":"Allow",
      "Principal": "*",
      "Action":["s3:GetObject"],
      "Resource":["arn:aws:s3:::${var.logging_bucket}/*"]
    }
  ]
} 

eof

    website {
        index_document = "index.html"
        error_document = "error.html"
    }

    cors_rule {
        allowed_origins = ["*"]
        allowed_headers = ["*"]
        allowed_methods = ["GET","HEAD"]
        expose_headers = ["ETag"]
        max_age_seconds = 3600 
    }

    logging {
       target_bucket = "${aws_s3_bucket.log_bucket.id}"
       target_prefix = "log/${var.logging_bucket}/"
    }
    provisioner "local-exec" {
        command = "aws s3 cp ../pixel.gif s3://${var.logging_bucket}/ "
    }
}


resource "aws_s3_bucket" "log_bucket" {
    bucket = "${var.log_bucket}"
    acl = "log-delivery-write"
    lifecycle_rule {
        id = "log"
        prefix = "log/"
        enabled = true

        expiration {
            days = 90
        }
     }


}

pixel.gif