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ARCHITECTURE.md

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Architecture

The following steps describe the initialization of the application:

  • First an early logger is setup to log any issues with config setup.
  • The global config is assembled from environment variables, command line arguments and a possible config file.
  • A new logger instance is set up using the created configuration.
  • Signal handling for double Ctrl-C invocation is set up to terminate the application
  • The DO updater service is spawned on a new thread.
  • The main thread blocks on regular termination signals to notify the updater thread when to quit.

The following image presents the overall components interacting in the updater service:

  • The DnsIpFetcher fetches the public IP from an external service.
  • The DomainRecordUpdater queries and update the domain records using DO API

Docker images

Docker builds are done using the cross-compilers provided by the following images

The application images are built using a multi-stage Dockerfile which are ran in Github Actions jobs using a combination of the docker/build-push-action@v2 action and shell code to create and push a multi-arch manifest list to the docker registries.

The final runtime images are based on alpine:latest.