https://github.com/renato0307/diy-dyn-dns
DIY Dynamic DNS using AWS serverless services and Go
https://github.com/renato0307/diy-dyn-dns
aws dns go serverless
Last synced: 2 months ago
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DIY Dynamic DNS using AWS serverless services and Go
- Host: GitHub
- URL: https://github.com/renato0307/diy-dyn-dns
- Owner: renato0307
- Created: 2022-10-29T13:52:46.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2022-10-29T15:24:52.000Z (over 3 years ago)
- Last Synced: 2025-03-21T18:36:37.494Z (over 1 year ago)
- Topics: aws, dns, go, serverless
- Language: HCL
- Homepage:
- Size: 633 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# DIY Dynamic DNS
I need to connect remotely to my home office and work in my Ubuntu workstation
from a laptop with less resources.
So, instead of using a dynamic DNS service, I decided to build my own.
Inspired by [this article](https://aws.amazon.com/blogs/startups/how-to-build-a-serverless-dynamic-dns-system-with-aws/) with some simplifications.
I used Terraform and Go instead of CloudFormation and Python.
## How am I using this?
## How much does it cost in terms of AWS services?
The AWS services will cost 6 USD per year, 0.50 USD per month.
You can see the details here:
https://calculator.aws/#/estimate?id=cbe57b14d97d3bf63a6073d6276dede0cf99b836
If you don't have a domain name, you can by a `.link` domain in AWS for 5 USD
per year.
So, the total cost per year is 11 USD, less than 1 USD per month.
## Deploy the AWS Service
First create the `terraform.tfvars` inside the `./infra` folder.
Example:
```hcl
api_key="put-here-a-complex-api-key"
dns_dyn_record_name="the dns record to be used, e.g. dyn.mypersondomain.com"
dns_hosted_zone="the route53 hosted zone id"
```
Then run the following commands:
```sh
export AWS_PROFILE=put-here-your-aws-profile-to-connect-to-aws
make init
make deploy
```
## Configuring the cronjob
Log in into the raspberry and run
```sh
crontab -e
```
Paste the contents of the `./crontab/update-dns.crontab` file.
Copy the `./crontab/update-dns.sh` file to `/home/pi` and give permissions to run:
```sh
chmod 700 update-dns.sh
```
Edit the `/home/pi/.profile` and set the `DIY_DYN_DNS_UPDATE_API_KEY` and
the `DIY_DYN_DNS_UPDATE_ENDPOINT` environment vars:
```sh
export DIY_DYN_DNS_UPDATE_ENDPOINT=https://your-id-here.lambda-url.eu-west-1.on.aws
export DIY_DYN_DNS_UPDATE_API_KEY=put-here-a-complex-api-key
```
## Generating an API key
You can use `openssl`:
```sh
openssl rand -base64 64
```
## Extra
1. Open the SSH port in your router and redirect to the raspberry SSH port.
2. Confiure SSH keys to facilitate access without password