devspace-demo

A Kubernetes Development Demo that uses Devspace.

Software setup

Install Docker

https://docs.docker.com/get-docker/

Use arkade to install various client tools

ark get buildx
ark get kubectl
ark get kubectx
ark get kubens
ark get helm
ark get devspace
ark get minikube
ark get yq
ark get argocd

Enable buildx docker plugin

mkdir -p ~/.docker/cli-plugins
ln -s ~/.arkade/bin/buildx ~/.docker/cli-plugins/docker-buildx

Environment setup

Start a minikube cluster

# Start a cluster
minikube start --driver=docker --kubernetes-version=v1.23.3 --cpus=2 --memory=8g

# Install platform dependencies
arkade install ingress-nginx --namespace ingress-nginx

# Start a tunnel to enable services of type load balancer
minikube tunnel

Usage

A Makefile exists to run a devspace build and deploy to the "demo" namespace

devspace use namespace demo
devspace deploy

ArgoCD

The use of ArgoCD is entirely optional and this demo is designed to show how the Devspace component chart can be used as the application's helm chart. YAML generation is therefore entirely controlled by the chart values.

Installation

Core install of ArgoCD

kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/master/manifests/core-install.yaml

Open up the UI

kubens argocd
argocd admin dashboard

Run the application

Create a registry pull secret in the target namespace

# Remove the old registry credentials
rm $HOME/.docker/config.json

# Login to the registry
docker login c8n.io

# Create a registry secret in the target namespace
kubectl create ns k8s-dev-demo
kubectl --namespace k8s-dev-demo create secret generic regcred --from-file=.dockerconfigjson=$HOME/.docker/config.json --type=kubernetes.io/dockerconfigjson
kubectl --namespace k8s-dev-demo patch serviceaccount default -p '{"imagePullSecrets": [{"name": "regcred"}]}'

Deploy the application

kubectl -n argocd apply -f - <<END
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: k8s-dev-demo
  namespace: argocd
spec:
  project: default
  destination:
    namespace: k8s-dev-demo
    server: https://kubernetes.default.svc
  source:
    chart: component-chart
    repoURL: https://charts.devspace.sh
    targetRevision: 0.8.4
    helm:
      values: |-
        containers:
        - image: c8n.io/myspotontheweb/k8s-dev-demo:v1.0
        service:
          ports:
          - port: 8080
        ingress:
          ingressClassName: nginx
          tls: false
          rules:
          - host: k8s-dev-demo.$(minikube ip).nip.io
            path: "/"
            pathType: "Prefix"
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
END