Simple example golang app with a k8s deployment for use in other examples.

This is good boilerplate code for starting a Golang project that will deploy on Kubernetes.

This example is used by these tutorials / posts

Sync a pod with rsync for fast K8s ECT cycle

How to build a x86/amd64 docker container image on Apple silicon (or any other arch)

Build, push and pull a container using Github GHCR or Gitlab Container Registry

Step 1: Build docker images

Assuming you will deploy to an amd64 arch...

If building on an amd64 arch machine:

docker build --tag trivial-golang-k8s-deployment .

If on another arch, such as Apple Silicon etc.

docker buildx build --platform linux/amd64 --tag trivial-golang-k8s-deployment --load .

Or if need Cgo and you want an Alpine base image:

docker buildx build -f Dockerfile-cross-cgo-xx-alpine --platform linux/amd64 --tag trivial-golang-k8s-deployment --load .

To build the development images:

docker build --tag trivial-golang-k8s-deployment -f Dockerfile.dev .

Or

docker buildx build --platform linux/amd64 --tag trivial-golang-k8s-deployment -f Dockerfile.dev --load .

Step 2: Upload to some docker registry

If you just want a test deployment using the original example - you can skip this

Otherwise read: https://www.izumanetworks.com/blog/use-github-gitlab-for-docker-registry/

Step 3: Deploy to K8s

For deployment on K8s you will need to push the docker image to a registry. You can't push to the registry for this repo, but these instructions will work if you forked this repo:

kubectl apply -f deployment.yaml

To apply our basic deployment.

apiVersion: v1
kind: Pod
metadata:
  name: trivial-golang-k8s-deployment
  labels:
    app: trivial-golang-k8s-deployment
spec:
  containers:
  - name: trivial-golang-k8s-deployment
    image: ghcr.io/izumanetworks/trivial-golang-k8s-deployment:latest
    imagePullPolicy: Always
    ports:
    - containerPort: 8080
    livenessProbe:
      httpGet:
        path: /hello
        port: 8080
      initialDelaySeconds: 5
      periodSeconds: 5
  imagePullSecrets:
    - name: regcred