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Vercel Dynamic DNS

Simple script for exposing a local server with Vercel DNS. It runs on CRON, checking the current IP address and updating DNS records for your domain.

Installation

  1. Ensure that you have jq installed
  2. Download dns-sync.sh
  3. Move dns.config.example to dns.config
  4. Edit the configuration variables as required
  5. Open the cron settings using the command crontab -e
  6. Add the following line to the cron job: */15 * * * * /path-to/vercel-ddns/dns-sync.sh

Usage example

# Creating
➜  ./dns-sync.sh
Updating IP: x.x.x.x
Record for SUBDOMAIN does not exist. Creating...
🎉 Done!

# Updating
➜  ./dns-sync.sh
Updating IP: x.x.x.x
Record for SUBDOMAIN already exists (id: rec_xxxxxxxxxxxxxxxxxxxxxxxx). Updating...
🎉 Done!

Docker

There is a dockerized version of vercel-ddns with CRON.

Create 3 files in your directory:

  1. Dockerfile.
  2. start.sh - docker entry point
  3. dns.config - configuration for vercel-ddns.

Dockerfile:

FROM alpine:latest

WORKDIR /root

# Installing dependencies
RUN apk --no-cache add dcron curl jq bash
SHELL ["/bin/bash", "-c"]

# Cloning config and start file
COPY dns.config /root/dns.config
COPY start.sh /root/start.sh

# Cloning app
RUN curl -o /root/dns-sync.sh https://raw.githubusercontent.com/iam-medvedev/vercel-ddns/master/dns-sync.sh
RUN chmod +x /root/dns-sync.sh

# Setting up cron
RUN echo "*/30 * * * * /root/dns-sync.sh >> /var/log/dns-sync.log 2>&1" >> /etc/crontabs/root

# Starting
CMD ["bash", "/root/start.sh"]

start.sh:

# Performs the first sync and starts CRON
bash /root/dns-sync.sh && crond -f