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Kubernetes101 - Pune Kubernetes Meetup 6
- 1. KUBERNETES 101 HANDS ONWORKSHOP KUBERNETES MEETUP PUNE 10 June 2017
- 2. HARSHAL SHAH Solutions Architect infraCloudtechnologies (www.infracloud.io ) https://twitter.com/harshal2623 1st Kubernetes partner India 2nd in APAC region Rancher partner - APAC
- 3. InfraCloud has publisheda FREE eBook on “Scaling and deploying Kubernetes” http://info.rancher.com/deploying-scaling-kubernetes-ebook
- 4. TIMELINES Time (Minutes -total 135) Agenda 00 - 15 Introduction & Setting up 15 - 45 Quick walkthrough of concepts 45 - 75 3 concepts, code & labs - 10 minute each 75 - 80 Break 80 - 110 3 concept, code & labs - 10 min each 110 - 135 Open House
- 5. Lab - SetupKubernetes in GKE & laptop • GKE Cluster creation • Kubectl on Google Cloud Console • Run command “kubectl proxy --port=8080” • Click this button • Append “/ui/” as shown in below highlight to open the Kubernetes Dashboard ● git clone https://github.com/infracloudio/kubernetes-101
- 6. TABLE OF CONTAINERS.... • What is Kubernetes, exactly? • How to setup a Kubernetes Cluster? • Various ways to get started with a Kubernetes cluster • Kubernetes Architecture • Kubernetes Concepts • POD, Deployments, Services, Labels & Selectors etc. • Kubectl Usage • Deploying app with Helm
- 7. KUBERNETES - THEBOOKISH DEFINITION • Kubernetes is an open-source platform for automating deployment, scaling, and operations of application containers across clusters of hosts, providing container- centric infrastructure (From http://kubernetes.io/docs/whatisk8s/) Open source project by Google Primarily targeted at containerized workloads Platform - automates deployment, scaling etc. Abstracts hosts and underlying infrastructure from you Portable - Run on public/private cloud, data center, your laptop - doesn’t matter Self - healing: It restarts, replaces, scales, monitors Containers Extensible - replace certain components if you want to. Extend with pluggable architecture
- 8. KUBERNETES HAS COMMONPATTERNS/DESIGNS Need to run related processes together in a shared context Integrating with underlying storage (Block or Bucket based) Check health of applications and maintain certain number of instances. Scale instances based on triggers. Load balancing between multiple instances of a container Provide easy and scalable way to locate and reach services (Aka service discovery and naming) Monitoring and log management Tagging and searching instances dynamically to do certain operations (For example list all web servers across all applications) Rolling updates, Canary deployments Everything is API based- so can be integrated with external systems.
- 9. SETTING UP KUBERNETES OnCloud & managed Google Container Engine StackpointCloud Tectonic from CoreOS OpenShift Online DIY - any cloud/data center Kubeadm (official utility) DIY On steroids KOPS (Targeted to AWS) Kismatic from Apprenda Rancher - provides enterprise features, multi cluster support Redhat OpenShift - comes with complete lifecycle features Many more: http://kubernetes.io/docs/getting-started-guides Platform9
- 10. KUBERNETES ARCHITECTURE Image Source:info.rancher.com/deploying-scaling-kubernetes-ebook
- 11. POD • Related containerstogether • Share same IP, port space & storage etc. • It’s a single unit for all practical purposes Code & Demo: Pod - create and destroy Pod flask redis NFSiSCSIGCE 10.10.1.100
- 12.
- 13. What just happened? *Courtesy Julia Evans blog which is an awesome place to learn many things http://jvns.ca Twitter : @b0rk
- 14. HEALTHCHECK Hey, app v1...You ready? Kubelet Pod app v1
- 15.
- 16. DEPLOYMENT • Drive desiredstate • Maintain desired POD instances • Enable deployment mechanisms such as rolling deploy, Canary, pause/resume etc. Deployment ReplicaSet Pod
- 17.
- 18. ROLLING UPGRADE -DEPLOYMENT LAB
- 19. SERVICES • Provide afixed endpoint for PODs irrespective of deletion/movement/modification of POD • Expose services/endpoints to outside cluster or to world • Services utilize labels to target PODs to represent
- 20. SERVICE TYPES ExternalName (Kubernetes1.5 onwards) • Serves as a way to return an alias to an external service residing outside the cluster. ClusterIP (Default) • Exposes service only within cluster NodePort • Creates a ClusterIP + exposes the same port on every node/host. This is typically used if you want to use an external loadBalancer LoadBalancer • NodePort+Creates a LB in cloud provider (Such as ELB) and points to respective ports
- 21.
- 22. LABELS AND SELECTORS Labels: “relase”:”1.4” “environment”:”QA” “app”:”billing” Selectors: env= prod release in (1.3, 1.4) app != payment • Classification mechanism • Labels • Tag things • Think like “roles” • Selectors • Filters & conditions
- 23. EXAMPLE Pod hello Pod hello labels: version: v1 track: stable labels: version:v1 track: test selector: “version=v1” selector: “track=stable” Pod hello Pod hello labels: version: v1 track: stable labels: version: v1 track: test
- 24. SECRETS & CONFIGMAPS • Secrets • Deliver sensitive data to intended target • ConfigMap • Configuration properties
- 25. NAMESPACES & NODES •Namespaces • Logically separate cluster • Nodes • Info about nodes
- 26. MORE TYPES Storage classesfor handling persistent data. They interact with cloud provider's storage. StatefulSet - for managing clusters with strong identity requirements (Kafka, Elastic, Zookeeper etc.) DaemonSet - things which need to run on a set or all nodes of cluster. For example logging agents Job - ensures a certain number of PODs execute the process and upon completion terminates. (For batch jobs)
- 27. RESOURCES • The workshopmaterial & codelabs at https://github.com/GoogleCloudPlatform/kubernetes- workshops • http://kubernetesbyexample.com • http://info.rancher.com/deploying-scaling-kubernetes- ebook • Another awesome resource for kubernetes hands on is from Kamal Marhubi at Part1, Part2, Part3
- 28. Scalable Microservices withKubernetes https://www.udacity.com/course/scalable-microservices-with-kubernetes--ud615
- 29. ধন্যবাদ! Dank je! Kiitos! આભાર! धन्यवाद! Grazie! Je vousremercie! ありがとうございました ！ ਤੁਹਾਡਾ ਧੰਨਵਾਦ! நன்றி! ధన్యవాదాలు! നന്ദി! THANK YOU!