Helm - Package manager in K8S
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The document provides an overview of Helm, a package manager for Kubernetes, detailing its functionality and structure, including essential files like values.yml and chart.yaml. It outlines how to create and manage applications with Helm, including installation, upgrades, and rollbacks. Additionally, it highlights the benefits of using Helm for teams, such as easy installation and app portability.
Helm - Package manager in K8S
- 1. Package Manager in K8S Piotr Perzyna - 03/21/2018
- 2. Agenda β What is HELM? β 4 Words to know β How to use it? β Why teams HELM?
- 3. What is HELM? HELM is a package manager like . . . . . . . . for kubernetes app. β npm β brew β pip β apt β yum
- 4. Simple chart $ helm create application application/ values.yml # A YAML file containing sample values chart.yaml # A YAML file containing information about the chart README.md # OPTIONAL: A human-readable README file requirements.yaml # OPTIONAL: A YAML file listing charts/ # OPTIONAL: A directory containing depends charts. templates/ # OPTIONAL: A directory of templates K8S manifest deployment.yml # EXAMPLE configmap.yml # EXAMPLE secrets.yml # EXAMPLE service.yml # EXAMPLE
- 5. Sample chart service.yml apiVersion: v1 kind: Service metadata: name: {{ .Values.name }} namespace: {{ .Values.namespace }} labels: app: {{ .Values.name }} release: {{ .Release.Name }} spec: type: {{ .Values.service.type }} ports: - protocol: TCP port: {{ .Values.service.port }} targetPort: 8000 selector: app: {{ .Values.name }} release: {{ .Release.Name }} values.yml namespace: default name: application image: repository: 10clouds/application tag: latest pullPolicy: IfNotPresent service: type: NodePort port: 80 env: DJANGO_DEBUG: β1β β¦ β¦ β¦
- 6. 4 Words to know! chart templated K8S manifest charts repository registry of charts + chart + value = release tiller pod to manage releases 1 2 3 4
- 7. Manage charts Install $ helm install -n release-name -f values.yml ./application LIST $ helm list --all NAME VERSION UPDATED STATUS CHART release-name 1 10:00 21/03/2018 DEPLOYED application-1.0.0 production 44 09:15 21/03/2018 DELETED another_app-1.0.0 UPDATE $ helm upgrade --recreate-pods -f values.yml --set image.tag=123 release-name ./application ROLLBACK $ helm rollback --recreate-pods release-name <version>
- 8. Why teams HELM? β easy install β app portability β versionable β easy rollbacks β templatable β better then kubectl apply -f
- 9. Q&A
- 10. THE END Thank you for your attention! Piotr Perzyna, 10Clouds