For Re:Invent 2014, Deployment Automation talk - ELB to S3 Website "Fail Whale" failover CloudFormation template

elb2s3failover.template

{
  "AWSTemplateFormatVersion" : "2010-09-09",

  "Description" : "Create a Route53 Fail Whale failover setup from ELB to S3. You need a preexisting ELB, S3 bucket configured as a Website endpoint, and Hosted Zone.",
  "Parameters" : {

    "ELBDnsName" : {
      "Type" : "String",
      "Description" : "Your ELB's DNS Name"
    },

    "ELBHostedZoneID" : {
      "Type" : "String",
      "Description" : "Your ELB's Hosted Zone ID"
    },
    
    "HostedZoneName" : {
      "Type" : "String",
      "Description" : "Your Hosted zone's name. Should end with a period after the TLD."
    },

    "DNSRecordName" : {
      "Type" : "String",
      "Description" : "The name of the DNS record to do failover for. NOTE: Your S3 bucket name must match this. Should end with a period after the TLD."
    },

    "S3BucketRegion" : {
      "Type" : "String",
      "Description" : "The S3 API region that your bucket lives in. US-Standard is us-east-1.",
      "AllowedValues": [
          "us-east-1",
          "us-west-1",
          "us-west-2",
          "eu-west-1",
          "eu-central-1",
          "ap-southeast-1",
          "ap-southeast-2",
          "ap-northeast-1",
          "sa-east-1"
      ],
      "ConstraintDescription": "Must be a valid S3 API region."
    }
  },

  "Mappings" : {

    "S3RegionWebEndpoints": {
      "us-east-1": {
        "DNSEndpoint": "s3-website-us-east-1.amazonaws.com",
        "HostedZoneId": "Z3AQBSTGFYJSTF"
      },
      "us-west-1": {
        "DNSEndpoint": "s3-website-us-west-1.amazonaws.com",
        "HostedZoneId": "Z2F56UZL2M1ACD"
      },
      "us-west-2": {
        "DNSEndpoint": "s3-website-us-west-2.amazonaws.com",
        "HostedZoneId": "Z3BJ6K6RIION7M"
      },
      "eu-west-1": {
        "DNSEndpoint": "s3-website-eu-west-1.amazonaws.com",
        "HostedZoneId": "Z1BKCTXD74EZPE"
      },
      "eu-central-1": {
        "DNSEndpoint": "s3-website.eu-central-1.amazonaws.com",
        "HostedZoneId": "Z21DNDUVLTQW6Q"
      },
      "ap-southeast-1": {
        "DNSEndpoint": "s3-website-ap-southeast-1.amazonaws.com",
        "HostedZoneId": "Z3O0J2DXBE1FTB"
      },
      "ap-southeast-2": {
        "DNSEndpoint": "s3-website-ap-southeast-2.amazonaws.com",
        "HostedZoneId": "Z1WCIGYICN2BYD"
      },
      "ap-northeast-1": {
        "DNSEndpoint": "s3-website-ap-northeast-1.amazonaws.com",
        "HostedZoneId": "Z2M4EHUR26P7ZW"
      },
      "sa-east-1": {
        "DNSEndpoint": "s3-website-sa-east-1.amazonaws.com",
        "HostedZoneId": " Z7KQH4QJS55SO"
      }
    }
  },

  "Resources" : {
    "myMainSite" : {
      "Type" : "AWS::Route53::RecordSetGroup",
      "Properties" : {
        "HostedZoneName" : {"Ref" : "HostedZoneName"},
        "Comment" : "Main site with fail whale.",
        "RecordSets" : [
          {
            "Name" : {"Ref" : "DNSRecordName"},
            "Type" : "A",
            "SetIdentifier": "Primary", 
            "Failover": "PRIMARY", 
            "AliasTarget" : {
              "HostedZoneId" : {"Ref" : "ELBHostedZoneID"},
              "DNSName" : {"Ref" : "ELBDnsName"},
              "EvaluateTargetHealth" : "True"
            }
          },
          {
            "Name": {"Ref" : "DNSRecordName"},
            "Type": "A",
            "SetIdentifier" : "Secondary",
            "Failover": "SECONDARY",
            "AliasTarget": {
                "HostedZoneId": { "Fn::FindInMap" : [ "S3RegionWebEndpoints", { "Ref" : "S3BucketRegion" }, "HostedZoneId" ]},
                "EvaluateTargetHealth": "False",
                "DNSName": { "Fn::FindInMap" : [ "S3RegionWebEndpoints", { "Ref" : "S3BucketRegion" }, "DNSEndpoint" ]}
            }
          }
        ]
      }
    }
  }
}