K8S - GitOps - ArgoCD

This project show how build a Continuous Deployment with Kubernetes, GitHub Actions and AgorCD.

Tools

• Docker
• Kubernetes [ https://kubernetes.io/docs/tasks/tools/ ]
• Kind [ https://kind.sigs.k8s.io/docs/user/quick-start ]
• Kustomize [ https://kubectl.docs.kubernetes.io/installation/kustomize/binaries/ ]
• Argo CD [ https://argo-cd.readthedocs.io/en/stable/getting_started/ ]

Build docker image

docker build -t ricardocosta94/kga:latest .

Create cluster with Kind:

kind create cluster --name=argocd

Change context with kubectl cli

kubectl cluster-info --context kind-argocd
kubectl get nodes

Apply deployment in project base dir

kubectl apply -f k8s/deployment.yaml
kubectl get pods

Create service in project base dir

[ https://kubernetes.io/docs/concepts/services-networking/service/ ]

kubectl apply -f k8s/service.yaml
kubectl get svc
kubectl port-forward svc/nodeapp 3000:3000

Kustomize auto generate kubernetes manifest

cd k8s && kustomize build

Argo CD steps

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

kubectl patch svc argocd-server -n argocd -p '{"spec": {"type": "LoadBalancer"}}'

kubectl port-forward svc/argocd-server -n argocd 8080:443

kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d

More details at: https://argo-cd.readthedocs.io/en/stable/getting_started/

Delete old deploy and service

kubectl get deploy
kubectl delete deploy nodeapp
kubectl delete svc nodeapp

Create new namespace

kubectl create namespace nodeapp

Start application by service and namespace

kubectl port-forward svc/nodeapp 3000:3000 -n nodeapp