Building Cloud-Native Applications with Kubernetes, Helm and Kubeless
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This document discusses building cloud-native applications with Kubernetes, Helm, and Kubeless. It introduces cloud-native concepts like containers and microservices. It then explains how Kubernetes provides container orchestration and Helm provides application packaging. Finally, it discusses how Kubeless enables serverless functionality on Kubernetes.
Building Cloud-Native Applications with Kubernetes, Helm and Kubeless
- 1. Building Cloud-Native Applications with Kubernetes, Helm and Kubeless Javier J. Salmerón Oracle Code Mexico
- 2. Outline ● What is Cloud Native? ● Container orchestration: Kubernetes ● Kubernetes application package ● Going Serverless: Kubeless
- 3. Outline ● What is Cloud Native? ● Container orchestration: Kubernetes ● Kubernetes application package ● Going Serverless: Kubeless
- 4. What is Cloud Native - Cloud offers innumerable advantages: easier deployment, on-demand scalability, rolling updates, better resource optimization… - However, traditional enterprise application design does not exploit all this potential - Cloud-Native → Have the Cloud as the main target platform when designing
- 5. What is Cloud Native (II) 1. Containerized. Each part (applications, processes, etc) is packaged in its own container. This facilitates reproducibility, transparency, and resource isolation. 2. Dynamically orchestrated. Containers are actively scheduled and managed to optimize resource utilization. 3. Microservices oriented. Applications are segmented into microservices. This significantly increases the overall agility and maintainability of applications. Properties:
- 6. A new ecosystem: CNCF Cloud-Native Computing Foundation: Cloud-Native technology ecosystem where applications can be ported between different public and private clouds. Projects: Companies:
- 7. Recent News
- 9. But that is not enough... ● Automatic deployments ● Continous Integration ● Zero downtime ● Failover mechanisms ● Load Balancing ● Monitoring ● Dynamic scalability ● Role-Based Access Control ● Rolling updates Next step: Container orchestration We want:
- 10. Outline ● What is Cloud Native? ● Container orchestration: Kubernetes ● Kubernetes application package ● Going Serverless: Kubeless
- 11. What is Kubernetes? Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications. More about Kubernetes... • Open-source, based on 15 years of container expertise at Google. • Rich core API for all key primitives • Cluster Federation, RBAC, Quotas, Network policies, etc. • Fastest growing project on GitHub
- 12. Kubernetes Usage
- 15. Basic Objects: Deployments Pods are normally scheduled using Deployments. It is a higher level object that allows: - Replica management - Pod scaling - Rolling updates - Rollback to a previous version - Clean-up policies - Pause/Resume ReplicaSet Deployment: wordpress Pod Replicas10.10.10.2 10.10.10.3
- 16. apiVersion: v1 kind: Deployment metadata: name: wordpress spec: replicas: 2 template: metadata: labels: app: wordpress spec: containers: - name: wordpress image: bitnami/wordpress:4.7-r0 ports: - containerPort: 80
- 17. Basic Objects: Services Define a set of pods that provide a micro-service. They provide a stable virtual endpoint for ephemeral Pods in your cluster, key to linking applications together 10.10.10.2 10.10.10.3 Service wordpress 31.120.4.2 Deployment: wordpress ReplicaSet
- 18. apiVersion: v1 kind: Service metadata: name: frontend labels: app: wordpress spec: type: LoadBalancer ports: - port: 80 targetPort: http selector: app: wordpress Example Service
- 19. Example: Deploying to Kubernetes $ kubectl create -f ./mariadb-deployment.yaml deployment "mariadb" created $ kubectl create -f ./mariadb-service.yaml service "mariadb" created $ kubectl create -f ./wordpress-deployment.yaml deployment "wordpress" created $ kubectl create -f ./wordpress-service.yaml service "wordpress" created
- 21. Some examples of other k8s objects Secrets PodSecurityPolicy Security PersistentVolume PersitentVolume Claim Persistence Namespaces ResourceQuota Limits Resource Mgmt Role RoleBinding ClusterRole RBAC Job CronJob Job Mgmt. . . .
- 22. Outline - What is Cloud Native? - Container orchestration: Kubernetes - Kubernetes application package - Going Serverless: Kubeless
- 23. Problems with Managing Resources Boilerplate when developing manifests Upgrades and configuration changes require manual editing No history for releases Difficult to share publicly or with members of your team Need tooling to hook into release lifecycle
- 24. Need a tool to package a group of resources as a single unit
- 25. Solutions available Helm Ksonnet • A Kubernetes package manager • Packages are called Helm Charts. • The chart is a collection of k8s manifest templates to create an instance of a Kubernetes application ● Declarative application management ● Typed templating system for the Kubernetes application developer ● Offers proper IDE experience (plugins for VSCode and Web Interface) ● It support richer and more configurable solutions ● Can be integrated with Helm.
- 26. Outline ● What is Cloud Native? ● Container orchestration: Kubernetes ● Kubernetes application package ● Going Serverless: Kubeless
- 27. “Serverless can also mean applications where some amount of server-side logic is still written by the application developer but unlike traditional architectures is run in stateless compute containers that are event-triggered, ephemeral (may only last for one invocation), and fully managed by a 3rd party” --Mike Roberts (https://martinfowler.com/articles/serverless.html) Serverless Definition
- 28. Kubeless: Kubernetes-Native Serverless Computing • Kubernetes-native serverless implementation • Functions allow for quick and easy application integrations • PubSub capabilities via Kafka • Open Source and non-affiliated • https://github.com/kubeless/kubeless
- 29. Get Started on Kubernetes with Bitnami 1 2 3 4 5 6 7 Javier’s contact info: [email protected] Bitnami-base Containers: www.bitnami.com/containers How-to Setup K8s on Oracle Cloud: http://bitn.am/2rzyQ8e Get Helm: github.com/kubernetes/helm & kubeapps.com Get Ksonnet: https://github.com/ksonnet/ksonnet-lib Get Kubeless: github.com/kubeless/kubeless Bitnami documentation for Containers: docs.bitnami.com/containers 8 Bitnami documentation on Kubernetes: docs.bitnami.com/kubernetes
- 30. Thank You
- 31. Easy deployment with Monocular
- 32. Deploy a Function $ kubeless function deploy tweet --trigger-http --runtime python27 --handler send-tweet.tweet --from-file send-tweet.py --dependencies requirements.txt
- 33. Containers: a new application Packaging format