By default, IPs are empirical unless you reserve IP. That means whenever you restart a GCP compute engine the machine will get a new ip from the DHCP pool. So your depended on services needs be updated according to the new IP. To emerge this problem we can set up a CloudDNS that will actually point to the machine current IP. But still you need to update the CloudDNS record whenever the machine rebooted.
So this solution will works as a container using
the command update-dns
(entrypoint /app),
host network and restart policy always.
It will then sync the IP address automatically
whenever it changes.
Quick Jump
docker run -v /tmp/secret:/secret --net=host -e GOOGLE_APPLICATION_CREDENTIALS=/secert/service-account.json -e DNS_NAMES=app1.demo-yourdnszone.com. -e GOOGLE_PROJECT=<google-project-id> -it shemul/gcp-dynamic-dns-updater:latest update-dns
to obtain the service account
IAM & admin > Service accounts -> create a service account -> DNS > DNS Administrator(role)
prepare and download the deps using
go mod download
I've added a build script to build the binary that actually we needs
bash build.sh -v 1.0.0
It will produce a docker image.