GitOps with Argo CD & Helm: Managing Your Kubernetes Repository

Title: GitOps with Argo CD & Helm:
Managing Your Kubernetes Repository
Presented during Kubernetes Community Days - March 2023 Israel

Transcript

1. 1 The Challenge
2. GitOps with Argo CD & Helm: Managing Your Kubernetes Repository Lior Yantovski | Chen Fliesher AT&T Israel DevOps March 2023 © 2023 AT&T Intellectual Property. AT&T and globe logo are registered trademarks and service marks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks are the property of their respective owners.
3. Chen Fliesher Lior Yantovski lior.yantovski@att.com chen@att.com About Us DevOps Tech-Lead Happily Married + 3 Girls 10 years at AT&T Azure, Kubernetes, CI/CD, Observability, Cloud-Native and more < > < > > < > <
4. 4 • What is GitOps? • How Does Argo CD implement GitOps? • Argo CD , Git & Helm • Managing configuration at scale • Repository structure options • Configuration flow • Demo Our Agenda
5. GitOps 5
6. 6 GitOps is a practice that combines developer workflows, implements source code repository as source of truth & enables continuous deployments GitOps main principles: 1. Declarative 2. Versioned and Immutable 3. Pulled Automatically 4. Continuously Reconciled https://opengitops.dev/ What is GitOps?
7. 7 What is GitOps? Are Kubernetes and GitOps a Perfect Match?
8. 8 What is GitOps? Benefits of Using GitOps  Developer best practices: code reviews, pull requests, history tracking  Can be implemented on IaC (Infrastructure as a Code) and Apps  Faster deployments and rollbacks by fast Observability feedback  Increased stability and reliability - No configuration drifts!
9. 9 What is GitOps? Challenges of Using GitOps  New process, new methodology, new mindset  Find the significant commit  Centralized secret management  Find the right Git repos structure
10. Argo CD 10
11. Argo CD 11 https://github.com/cncf/surveys/blob/main/cloudnative/2022%20CNCF%20Survey%20-%20Raw%20Data.csv https://blog.palark.com/cncf-cloud-native-projects-usage-stats-2022/
12. Argo CD 12
13. Argo CD 13 Let’s define “CD” in Argo Application Source Destination + NS Sync Policy Project Chart/Container
14. 14 apiVersion: argoproj.io/v1alpha1 kind: Application metadata: name: kcd-api-app namespace: argocd spec: project: kcd sources: - repoURL: 'https://my-git-repo.com/kcd-api' targetRevision: main ref: kcd-api - repoURL: 'my-container.registry.io/charts' targetRevision: 0.0.2 chart: 'kcd-api-chart' helm: valueFiles: - $kcd-api/values.yaml destination: server: 'https://my-kubernetes-cluster.default.svc' namespace: kcd-dev-apps syncPolicy: automated: prune: true syncOptions: - CreateNamespace=true
15. Argo CD 15 Managing Applications at Scale
16. 16 Argo CD & Git
17. How to arrange your Git repository? 17 1. Use one single Git branch Don’t use long term branches per Environment – anti pattern! Do use short-lived branches to allow Pull Request reviews with required reviewers 2. Single source of truth doesn’t mean one Git repo! • “All in one” - Single Repository for All – separation using Directories • “Fan Out” - Repository per Environment - separation using Repositories Argo CD & Git
18. 18 Argo CD, Git & Helm
19. Helm is More Than just a Template 19  Helm allows validation of CRs/CRDs YAML prior to applying  Helm supports various methods of distribution  Helm allows dependency modules (just like code)  Use Helm Charts for templatization to keep your code DRY and avoid repeated YAMLs Argo CD, Git & Helm
20. Helm is More Than just a Template 20 Argo CD, Git & Helm
21. 21 Argo CD, Git & Helm Repository structure “All in One”
22. 22 Configuration flow – “All in One” Argo CD, Git & Helm
23. 23 Argo CD, Git & Helm Repository structure “Fan Out”
24. 24 Argo CD, Git & Helm Configuration flow “Fan Out”
26. 26 Environment Self-Contained Keep your Code DRY Manage Applications at Scale Fan Out Repository Structure Summary Choose your own Argo way
27. Thank You & Questions? 27
28. 28 https://codefresh.io/blog/stop-using-branches-deploying-different-gitops- environments/ https://codefresh.io/blog/how-to-model-your-gitops-environments-and-promote- releases-between-them/ https://codefresh.io/blog/pains-gitops-1-0/ https://argo-cd.readthedocs.io/en/stable/user-guide/multiple_sources/ https://developers.redhat.com/articles/2023/02/20/multiple-sources-argo-cd- applications#examples_of_multiple_sources_applications https://developers.redhat.com/articles/2022/09/07/how-set-your-gitops-directory- structure Useful links