The document discusses Kubernetes deployment methods, challenges, and the role of Helm as a package manager for managing Kubernetes applications. It covers Helm's architecture, key commands, best practices for utilization, and provides an overview of various tools for Kubernetes deployment automation. The presentation includes a live demo and emphasizes the importance of Helm in simplifying application management within cloud-native environments.

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
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3. Agenda
• k8s App Deployment Methods
• k8s Deployment Challenges
• What is Helm ?
• Helm: Brief Architecture
• Helm Files Structure
• Live Demo
• Best practices of Helm
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4. k8s Application Deployment File
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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
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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/
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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
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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/
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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
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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
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11. Demo Time
• Deploy sample application using kubectl method
• Deploy app using helm3
• Release new version of sample application using
Helm
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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
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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
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