= Cloud Native Go Volume 1

This repository contains the example sources for the Cloud Native Go Volume 1 course.

== Prerequisites

In order to build and run this showcase you need to have a couple of things installed:

• The Go SDK (e.g. using Brew)
• An IDE for the development, like Visual Studio Code or IntelliJ
• The Docker Toolbox or native Docker, whatever you prefer

== Building the Go microservices

$ go build
$ ./Cloud-Native-Go.exe

== Containerization with Docker

$ docker build -t cloud-native-go:1.0.1 .
$ docker images
$ docker tag cloud-native-go:1.0.1 lreimer/cloud-native-go:1.0.1
$ docker push lreimer/cloud-native-go:1.0.1

== Running Docker image locally

$ docker run -it -p 8080:8080 cloud-native-go:1.0.1
$ docker run -it -e "PORT=9090" -p 9090:9090 cloud-native-go:1.0.1
$ docker ps --all

$ docker run --name=cloud-native-go -d -p 8080:8080 cloud-native-go:1.0.1
$ docker ps
$ docker stats
$ docker stop
$ docker start

== Improved Containerization with Docker

$ GOOS=linux GOARCH=amd64 go build
$ docker build -t cloud-native-go:1.0.1-alpine .
$ docker images
$ docker tag cloud-native-go:1.0.1-alpine lreimer/cloud-native-go:1.0.1-alpine
$ docker push lreimer/cloud-native-go:1.0.1-alpine

== Docker Compose

$ docker-compose build
$ docker images
$ docker-compose up -d
$ docker-compose kill
$ docker-compose rm

== Kubernetes and Pods

$ kubectl get pods
$ kubectl create -f k8s-pod.yml
$ kubectl get pods
$ kubectl describe pod cloud-native-go

$ kubectl port-forward cloud-native-go 8080:8080

$ kubectl get pods --show-labels
$ kubectl get pods -o wide -L env
$ kubectl label pod cloud-native-go hello=world
$ kubectl get pods -o wide -L hello
$ kubectl label pod cloud-native-go env=prod --overwrite
$ kubectl get pods -o wide -L env

$ kubectl get ns
$ kubectl get pods --namespace kube-system
$ kubectl create -f k8s-namespace.yml
$ kubectl get ns
$ kubectl create -f k8s-pod.yml --namespace cloud-native-go

$ kubectl delete -f k8s-pod.yml

== Kubernetes Deployments and Services

$ kubectl get services,deployments,pods

$ kubectl create -f k8s-deployment.yml
$ kubectl get deployments,pods

$ kubectl apply -f k8s-deployment.yml

$ kubectl create -f k8s-service.yml
$ kubectl get services
$ kubectl describe service cloud-native-go

$ kubectl delete -f k8s-deployment.yml
$ kubectl delete -f k8s-service.yml

== Kubernetes Scaling and Rolling Updates

$ kubectl create -f k8s-deployment.yml --record=true

$ kubectl scale deployment cloud-native-go --replicas=5
$ kubectl scale deployment cloud-native-go --replicas=3

$ kubectl rollout history deployment cloud-native-go

$ kubectl apply -f k8s-deployment.yml

$ kubectl edit deployment cloud-native-go

$ kubectl set image deployment cloud-native-go cloud-native-go=cloud-native-go:1.0.2

$ kubectl rollout history deployment cloud-native-go
$ kubectl rollout undo deployment cloud-native-go --to-revision=0

$ kubectl delete -f k8s-deployment.yml