Kubernetes 101
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Kubernetes is an open source container orchestration system that automates the deployment, maintenance, and scaling of containerized applications. It groups related containers into logical units called pods and handles scheduling pods onto nodes in a compute cluster while ensuring their desired state is maintained. Kubernetes uses concepts like labels and pods to organize containers that make up an application for easy management and discovery.
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Kubernetes 101
- 1. @muktaa Kubernetes 101 Mukta Aphale Founder & CEO, Crevise Technologies www.crevise.com
- 2. @muktaa Kubernetes is an open source orchestration system for Docker containers. It handles scheduling onto nodes in a compute cluster and actively manages workloads to ensure that their state matches the users' declared intentions. Using the concepts of "labels" and "pods", it groups the container which make up an application into logical units for easy management and discovery.
- 4. @muktaa
- 5. @muktaa Let’s Start from the Start… With some analogies!
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- 8. @muktaa
- 9. @muktaa
- 10. @muktaa
- 12. @muktaa What are containers? Virtual environment which is good enough to run your application Lightweight Run anywhere Jails, LXC Containers, CRI-O, Rkt, Docker
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- 14. @muktaa Running thousands of containers in production
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- 16. @muktaa Container Orchestration Containers need to be managed Networking is hard Containers must be scheduled, distributed and load balanced Data persistence
- 17. @muktaa Welcome Kubernetes! K8S Greek word for ship’s captain Helmsman Cybernetics + Governor Started by Google Platform for running thousands of containers Based on ideas proven at Google over 10 years Everything at Google runs in a container. Google launches 2 billion containers per week.
- 18. @muktaa Open Source https://github.com/kubernetes/kubernetes Very active open source project 23k stars, 1400+ contributors Apache 2 licensed Written in Go Hosted by the Cloud Native Computing Foundation (CNCF)
- 19. @muktaa Benefits Container Orchestration made easy ClusterOps Vs AppOps Reduce cost to run many things in production Enables new ways of building applications
- 21. @muktaa Pod A group of containers that share a common resource
- 22. @muktaa Pod Manifest Pods are defined used JSON or YAML file apiVersion: v1 kind: Pod metadata: name: nginx spec: containers: - name: nginx image: nginx ports:
- 23. @muktaa Labels Name. To identify Pods
- 24. @muktaa Kubelet Container Agent lowest level component in Kubernetes It has one job: given a set of containers to run, make sure they are all running. “Kubelets run pods”
- 25. @muktaa etcd Metadata service Distributed key-value store Store and Replicate data used by Kubernetes across the entire cluster Manages state of cluster Raft algorithm $ mkdir etcd-data $ docker run --volume=$PWD/etcd-data:/default.etcd -- detach --net=host quay.io/coreos/etcd > etcd-container-id
- 26. @muktaa API Server Kubernetes API kubelet will get its pods to run from the Kubernetes API server $ ./kube-apiserver --etcd- servers=http://127.0.0.1:2379 -- service-cluster-ip-range=10.0.0.0/16
- 27. @muktaa Proxy LB for Pods kube-proxy TCP,UDP stream forwarding or round robin forwarding across a set of backends
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- 31. @muktaa Scheduler Schedules pods in worker nodes Ensures pods are placed on free nodes Balances resource utilization Node affinity, Pod affnity/anti-affinity Custom scheduler
- 33. @muktaa Master
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- 36. @muktaa Hands-on Workshop At 2pm Convention Centre
- 37. @muktaa Hands-on Prerequisites Laptop, Internet Virtualbox Workshop Setup: https://gist.github.com/muktaa/ The 1st gist (name: Kubernetes 101)