Learn GitOps with ArgoCD

Topics Discussed:

• Introduction to Containers,Kubernetes,Github
• GitOps Workflow
• ArgoCD Setup
• Create an application
• Auto Sync,Prune,Self_Heal
• Create a helm based application
• Create a Kustomize Application
• Hook-Presync and PostSync
• Integrating with CI/CD Systems
• What can be brought into GitOps umbrella
• Multiple repo and clusters

What is Gitops?

GitOps is an operating model for Kubernetes and other cloud native technologies, providing a set of best practices that unify Git deployment, management and monitoring for containerized clusters and applications.

What is ArgoCD?

Implemented as a Kubernetes controller, ArgoCD continually monitors running applications to verify that the live state matches the desired state, as defined in Git.

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

Creating an App in ArgoCD

argocd app create guestbook –repo https://github.com/argoproj/argocd-exampleapps.git –path guestbook –dest-namespace default –dest-server https:// kubernetes.default.svc –directory-recurse

Create a Helm app

argocd app create helm-guestbook –repo https://github.com/argoproj/argocdexample-apps.git –path helm-guestbook –dest-namespace default –dest-server https://kubernetes.default.svc –helm-set replicaCount=2

Create a Kustomize app

argocd app create kustomize-guestbook –repo https://github.com/argoproj/ argocd-example-apps.git –path kustomize-guestbook –dest-namespace default –dest-server https://kubernetes.default.svc –kustomize-image gcr.io/heptioimages/ks-guestbook-demo:0.1

Hooks-Presync and PostSync

Synchronization can be configured using resource hooks. Hooks are ways to run scripts before, during, and after a Sync operation.
PreSync-Executes prior to the application of the manifests.
PostSync-Executes after all Sync hooks completed and were successful, a successful application, and all resources in a Healthy state.

Project URL: https://github.com/basil1987/argocd-example-apps
Argocd official documentation: https://argo-cd.readthedocs.io/en/stable/