Stateful Bulk Route53 DNS Management via TinyDNS

macrotis --input <FILE/DIR> --config <FILE> [SUBCOMMAND]

• execute - Calculate changes to be made and send them to Route53
• noop - Calculate changes and print them out, but do not send to R53
• lint - Validate the input file(s) only and exit

Macrotis aims to provide what the Terraform AWS module is missing - the ability to rapidly and statefully manage large numbers of DNS records in Route53 using a simple and compact flat file format. Future updates aim to target additional cloud DNS providers including Azure.

Yes! Macrotis allows the storage of a statefile either locally or in an AWS S3 bucket (and potentially other remote storage options in the future). This means you can manage as many or as few records as you like in an automated fashion, as well as having separate automation jobs that manage only their own particular record sets.

TinyDNS, aka DJBDNS, is a very small DNS resolver daemon with a simple and straightforward configuration style: Each record has a prefix denoting its type, and a varying number of additional datapoints, all nicely separated by colons. It's incredibly compact, easy to use, and well-documented.

Don't get me wrong, Terraform is great. Unfortunately, the Route53 module is really only intended to handle, at most, a few dozen DNS records, ostensibly attached to whatever other AWS resources are being managed by a given TF configuration. Try to use it for bulk zone management and you're asking for a world of frustration, terraform plan runs that can take hours upon hours to complete, and silent weeping as you watch every single record downloaded and compared, one by one by one. It's awful.

Because Go sucks. Don't @ me.

By default, Macrotis looks for a file called macrotis.conf in the working directory. It is in JSON format and looks like so:

{
    "provider": {
        "name": (String) A name for the Route53 Provider,
        "region": (String) Region for Route53 Zones,
        "assume_role": (bool) Whether or not to assume a role,
        "role_arn": (String) An IAM ARN for the role to assume
        "session_name": (String) An optional session name
    },
    "statefile": {
        "backend": (String) "s3" or "local",
        "filename": (String) A filename for local statefile storage,
        "bucket": (String) A bucket to store the state in,
        "key": (String) The key within the bucket the file will be stored as,
        "region": (String) Region for S3 bucket
        "tags": {
          (String): (String),
          optional: tags for tagging the S3 bucket/key
          },
        "role_arn": (String) An IAM ARN if a role will be assumed for S3
        "session_name": (String) An optional session name
    },
    "zones": [
        {
            "name": (String) Friendly name for the zone for logging,
            "domain": (String) The domain name for the zone (ie 'domain.com')
            "id": (String) AWS R53 Zone_ID for the zone
        }
    ]
}

Macrotis expects you to have set the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables set. Or whatever other default credential-y things Rusoto supports, I don't know, I didn't read the docs, I'm a busy person.

As previously noted, Macrotis uses the TinyDNS format for its input files. Here's an example:

+foo.domain.com:1.2.3.4:900
=bar.domain.com:1.2.3.5:900
^6.3.2.1.in-addr.arpa:baz.domain.com:300

1. Creates an 'A' record for foo.domain.com pointing at 1.2.3.4 with a TTL of 900
2. Creates both an 'A' record for bar.domain.com pointing at 1.2.3.5 with a TTL of 900 AND a 'PTR' record for 5.3.2.1.in-addr.arpa pointing at bar.domain.com with a ttl of 900.
3. Creates a 'PTR' record for 6.3.2.1.in-addr.arpa pointing at baz.domain.com with a ttl of 300

Macrotis currently supports all IPv4 TinyDNS record formats. Nobody uses IPv6. No you don't, stop lying.

• Rust 1.33
• LibSSL dev libraries installed
• AWS user or role with the following permissions:
  • route53:ChangeResourceRecordSets on arn:aws:route53:::hostedzone/<zone id>
  • route53:ListResourceRecordSets on arn:aws:route53:::hostedzone/<zone id>
  • s3:GetObject on arn:aws:s3:::<bucket>
  • s3:PutObject on arn:aws:s3:::<bucket>

4-July-2019