Leveraging Helm to manage Deployments on Kubernetes
- 1. 09-08-2020 Fellow Cloud 1 LeveragingHelmtomanage KubernetesDeployments
- 2. About Speaker Works as DevOps Engineer https://github.com/manoj8928/ #docker #k8s #devsecops #cloud #automation https://medium.com/@manoj.bhagwat60 @manoj8928 09-08-2020 Fellow Cloud 2
- 3. Agenda • k8s App Deployment Methods • k8s Deployment Challenges • What is Helm ? • Helm: Brief Architecture • Helm Files Structure • Live Demo • Best practices of Helm 09-08-2020 Fellow Cloud 3
- 4. k8s Application Deployment File 09-08-2020 Fellow Cloud 4
- 5. ApplicationDeploymentMethods • blue/green: New version alongside old version then switching at one point; Rollout/Rollback • canary: Release a new version to few users and then decide full rollout based on result • a/b testing: Feature testing based on statistics; dark deployment that users are unaware of update • rolling: Update new version one after another slowly with no downtime • recreate: Create a new one and kill the old one; best for development environments • shadow: Both versions are running parallel with not impacting other; mocking services 09-08-2020 Fellow Cloud 5
- 6. k8sDeployment/AutomationTools • Kubectl – Create, manage and deploy k8s artifacts - https://kubernetes.io/docs/reference/kubectl/ • Kustomize - A template-free way to customize application configuration - https://kustomize.io/ • CNAB - Cloud Native Application Bundling - https://cnab.io/ • Skaffold - building, pushing and deploying your application - https://skaffold.dev/ • Spinnakar – Multi cloud continous delivery - https://www.spinnaker.io/ • Kudo - Universal declarative Operator - https://kudo.dev • Kompose – Move docker file to k8s objects - http://kompose.io/ • Draft – Streamlined k8s Deployment - https://draft.sh/ • Brigade – Event driven scripting for k8s - https://brigade.sh/ • Kashti – Visualization Dashboard for Brigade - https://github.com/brigadecore/kashti • Jenkin - k8s plugin & Jenkin X - https://github.com/jenkinsci/kubernetes-plugin • Github - Marketplace for tools - https://github.com/marketplace/category/continuous-integration • Helm – The package manager for k8s - https://helm.sh/ 09-08-2020 Fellow Cloud 6
- 7. Life without Helm • Write Kubernetes manifests by hand • Do this every time you need to release anything • Figure out your own sharing • Tweak resources by hand • Use kubectl to manage these manifests 09-08-2020 Fellow Cloud 7
- 8. What is Helm? Helm is a package manager, helps you manage Kubernetes applications — define, install, and upgrade even the most complex Kubernetes application • Helm is like apt or yum in Linux World • Why do we need a package manager? • Application focused Better control • Container version handling - upgrade/rollback • Manage dependencies • Reproducible and shareable • Helm initially started with Deis (now with Microsoft) & then Google Deployment Manger team joined to create helm2. Helm is now in CNCF Incubation project - https://helm.sh/ 09-08-2020 Fellow Cloud 8
- 9. Helm: Architecture Helm Client, a command line tool with the following responsibilities • Interacting with the Tiller server • Sending charts to be installed • Upgrading or uninstalling of existing releases • Managing repositories Tiller Server, an in-cluster server with the following responsibilities: • Interacts with the Helm client • Interfaces the Kubernetes API server • Combining a chart and configuration to build a release • Installing charts and tracking the release • Upgrading and uninstalling charts 09-08-2020 Fellow Cloud 9
- 10. Charts, Repositories, Releases Helm Commands • Init: Set up Helm for the first time (helm init) • Install: Install a chart (helm install alpine) • Get, Status, List: Find out about charts (helm list) • Repo Add, List, Remove, Index: Manage your helm repositories • Search: Search repos for charts • Create, Package: Create and package new charts 09-08-2020 Fellow Cloud 10
- 11. Demo Time • Deploy sample application using kubectl method • Deploy app using helm3 • Release new version of sample application using Helm 09-08-2020 Fellow Cloud 11
- 12. Best Practices • Create Chart for each (micro)service; keep it in same Git repository • Learn and practice Go Template language (and Sprig template library) • Use Helm hooks to control release flow • Use helm test to validate releases • Host your own Helm repository for private charts; just serve index.html and packaged charts (can be hosted on AWS S3, Google Storage, GH pages, or other web server) • Manage environments with multiple Values files • (!) Do not commit secrets into GitHub; or encrypt secrets with sops or similar tool • Follow community Helm best practices and conventions: take a look at docs and Kubernetes/charts examples • Use helm template plugin to debug Helm Charts; or use --dry-run flag 09-08-2020 Fellow Cloud 12
- 13. More About Helm CNCF SIG Helm - • https://www.cncf.io/announcement/2019/09/12/cloud-native-computing-foundation-announces- application-delivery-sig/ GitHub Repo Link: • http://github.com/kubernetes/helm Official Documentation • https://helm.readthedocs.io/en/latest/architecture/#helm-classic-architecture Helm • https://helm.sh 09-08-2020 Fellow Cloud 13
- 14. 09-08-2020 Fellow Cloud 14