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https://github.com/agorf/dyndns53

Run your own dynamic DNS service with Amazon Route 53
https://github.com/agorf/dyndns53

amazon aws cron crontab dns dynamic-dns dyndns dyndns-service golang iam-policy route53

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Run your own dynamic DNS service with Amazon Route 53

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# dyndns53



dyndns53 lets you run your own [dynamic DNS][] service with [Amazon Route 53][]

by updating a domain of your choice with the public IP address of the machine it

runs on.



[dynamic DNS]: https://en.wikipedia.org/wiki/Dynamic_DNS

[Amazon Route 53]: https://aws.amazon.com/route53/



## Installation



[Install Go][] and issue:



    $ go get github.com/agorf/dyndns53



[Install Go]: https://golang.org/doc/install



## Configuration



Register a domain name, if you haven't already. Then log in to the [AWS

management console][] and follow the steps below.



[AWS management console]: https://console.aws.amazon.com/



### Step 1: Create a hosted zone



Go to the [Route 53 Hosted Zones page][] and click _Create Hosted Zone_.



Fill in your domain name in _Domain Name_ and choose _Public Hosted Zone_ for

_Type_, then click _Create_.



In the hosted zone page, note down the domain names of the Amazon name servers

(row with type _NS_). You need to set them as name servers in your domain name

registrar.



**Note:** DNS propagation usually takes a few hours for newly-registered

domain names. If resolving your domain doesn't work, try again later.



Click _Back to Hosted Zones_ and note down the _Hosted Zone ID_ since you will

need it in the next step.



[Route 53 Hosted Zones page]: https://console.aws.amazon.com/route53/home#hosted-zones:



### Step 2: Create an IAM policy



Go to to the [IAM Policies page][] and click _Create Policy_.



Click _Select_ on the _Policy Generator_ section.



In the following form, choose _Allow_ for _Effect_, _Amazon Route 53_ for _AWS

Service_, _ChangeResourceRecordSets_ for _Actions_, fill in

`arn:aws:route53:::hostedzone/` for _Amazon Resource Name (ARN)_

(replacing `` with the one from the previous step) and click _Add

Statement_ and then _Next Step_.



Fill in a name for _Policy Name_ so that you can look up the policy later and

click _Create Policy_.



[IAM Policies page]: https://console.aws.amazon.com/iam/home#/policies



### Step 3: Create an IAM user



Go to the [IAM Users page][] and click the _Add user_ button.



Fill in the user name, check _Programmatic access_ for _Access type_ and click

_Next: Permissions_.



On the permissions page, click the last option _Attach existing policies

directly_ and fill in the _Search_ field with the name of the policy you created

in the previous step. Click on the policy to check it and click _Next: Review_.



Click _Create user_ and you will be presented with an _Access key ID_ and a

_Secret access key_ (masked), the credentials dyndns53 needs to access the

service programmatically. Don't close the window since you will need them in the

next step.



[IAM Users page]: https://console.aws.amazon.com/iam/home#/users



### Step 4: Create an AWS credentials file



In the machine you plan to run dyndns53, issue:



    $ mkdir -p ~/.aws

    $ touch ~/.aws/credentials

    $ chmod go-r ~/.aws/credentials # prevent other users from reading the file



Edit the file with your editor:



    $ $EDITOR ~/.aws/credentials



And write:



    [dyndns53]

    aws_access_key_id = 

    aws_secret_access_key = 



Replacing `` and `` with the actual values you

were presented in the previous step.



You are now ready to use dyndns53.



## Usage



Running the program with no arguments prints a usage text:



    $ dyndns53

    Usage of dyndns53:

      -log string

            file name to log to (default is stdout)

      -name value

            record set names (-name domain1 -name domain2 -name domain3 ...)

      -ttl int

            TTL (time to live) in seconds (default 300)

      -type string

            record set type; "A" or "AAAA" (default "A")

      -zone string

            hosted zone id



You can set [Cron][] (with `crontab -e`) to run the program e.g. every five

minutes:



    */5 * * * * ~/go/bin/dyndns53 -name mydomain1 -name mydomain2 -zone HOSTEDZONEID -log ~/dyndns53.log



Where `~/go` is your `$GOPATH`, `mydomain1` and `mydomain2` are the names of the

record sets (domains) you want to update and `HOSTEDZONEID` is the id of the

[hosted zone][] they belong to.



If the record set does not exist, it will be created the first time dyndns53

runs.



Assuming that the IP address changes right after dyndns53 runs (with a default

TTL of 5 minutes), the above [Cron][] entry has a worst-case scenario of a

10-minute delay until the domain name resolves to the new IP address (5 minutes

until next run that issues the update + 5 minutes for the DNS change to

propagate).



[Cron]: https://en.wikipedia.org/wiki/Cron

[hosted zone]: http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/ListInfoOnHostedZone.html



## License



Licensed under the MIT license (see [LICENSE.txt][]).



[LICENSE.txt]: https://github.com/agorf/dyndns53/blob/master/LICENSE.txt



## Author



Angelos Orfanakos, https://agorf.gr/