Overview

Technical challenge to containerise a small Go app and provide a Kubernetes Deployment manifest.

Fixes, Changes, Improvements

main.go

• Listen on all interfaces
• Fix function call for optimization truth endpoint
• Cosmetic formatting

Dockerfile

• Refactor as a multistage build
• Parent image pinned to a specific Golang version to promote better build repeatability
• Remove redundant package install (git)
• Build minimal, static binary - strip debugging and symbol table
• Generate lean, single layer image
• Configure to run as non-root

Build & Deploy Instructions

Required tools:

• Docker
• kubectl
• make

Tasks related to the building/deploying of the image are captured in the Makefile. Docker Hub serves as the registry for builds. The following environment variables must be exported prior to invoking make:

• DOCKER_HUB_REPO
• DOCKER_HUB_TOKEN
• DOCKER_HUB_USERNAME

To build/push the image locally, simply run the following:

make build
make push

The apply target will deploy a simple Deployment & Service to your kubectl current context (default Namespace).

make apply

A GitHub workflow is also included in the repo which leverages a couple of targets in the Makefile. Ensure you have added the above variables as Actions secrets after forking the repo.