Introduction to Kubernetes and Google Container Engine

Gives a quick introduction to Kubernetes and Google Container Engine.

Was presented at Google Developer Group Oxford
http://www.meetup.com/GDG-Oxford/events/227474697/

Transcript

1. Introduction to Kubernetes and Google Container Engine Omer Dawelbeit | @omerio | +OmerDawelbeit
2. About me • Software Dev & Architecture Consultant @ iNetria • Founder @ OfficeMA.biz • Google Developer Expert (2015) • Part-time PhD researcher @ Uni of Reading • Blog at omerio.com • @omerio
3. Content • Containers • Kubernetes • Container Engine • Getting Started • Demo Time • Wrap Up
4. Containers
5. What is a container? • Lightweight environment • Static application environment • No external dependencies • Application isolation • Reusable, runnable artifacts • Loosely coupled • Portable
6. Containers vs. VMs
7. Kubernetes (k8s) /koo-ber-nay'-tace/ From κυβερνήτης: Greek for "helmsman" or "pilot"
8. What is Kubernetes? • Containers orchestrator (Docker, Rocket) • Open source • Run on dev machine, own hardware or cloud • Inspired by Google’s experience • Written in Go • Manages applications, not machines
9. Containers Orchestration
10. What can Kubernetes do? • co-locating helper processes, • mounting storage systems (volumes), • application health checking, • replicating application instances, • horizontal auto-scaling, • load balancing, • rolling updates, • and resource monitoring.
11. Kubernetes in 10 minutes 145 users! It’s so quiet! 600 users! http://omerio.com/2015/12/18/learn-the-kubernetes-key-concepts-in-10-minutes/
12. Cluster Overview • Pods • Containers • Labels • Replication Controllers • Services • Nodes • Kubernetes Master
13. Pods • Smallest deployable unit • Scheduled to nodes • Hosts containers and volumes • Ephemeral • Each has its own routable IP (no NAT) • Containers in a pod ◦ Tightly coupled ◦ Share IP, port and IPC namespaces ◦ Talk to each other through localhost http://blog.kubernetes.io/2015/06/the-distributed-system-toolkit-patterns.html
14. Pods Questions • How to persist data across container restarts? • How to create multiple copies of a Pod? • How can containers reference each other reliably?
15. Labels • Key/value pairs (tier=frontend, app=myapp) • Metadata with semantic meaning • Membership identifier (services & rc) • Queryable by Selectors (grouping)
16. Replication Controllers • Keeps Pods running • Ensures N copies of Pods are running • Provides direct control of Pods • Uses a Pod template • Determines constituent Pods using Label Selector
17. Replication Controllers
18. Services • An abstraction • Logical grouping of Pods • Determines constituent Pods using Label Selector • Load balancing between constituent Pods • Gets a stable virtual IP, port & DNS name
19. Services
20. A few more... • Volumes • Secrets • Namespaces • Resource based scheduling ... spec: containers: - name: locust image: gcr.io/rabbit-skateboard/guestbook:gdg-rtv resources: requests: memory: "300Mi" cpu: "300m" limits: memory: "300Mi" cpu: "300m"
21. Google Container Engine
22. Hosted Kubernetes Environment • GA in August 2015 • Managed Kubernetes (v1) • Manages Kubernetes master • Manages updates • Cluster resize via Managed Instance Groups • Cluster node autoscaling (Cloud Monitoring) • Centralised logging • Google Cloud VPN support
23. Google Container Engine Overview
24. Getting Started
25. Resources • A hands-on introduction to Kubernetes - Mandy Waite @ Google • Kubernetes Documentations • Google Container Engine Docs Starting from scratch? check my blog • Building & Testing Docker Containers using Google Cloud Shell • Learn the Kubernetes Key Concepts in 10 Minutes • Getting Started with Kubernetes on Google Container Engine ◦ Youtube tutorial
26. Demo Time
27. Deploying a Graphviz cluster • Demo Slides
28. Wrap Up
29. What we have covered • Why are containers so popular • What is Kubernetes? • What is Google Container Engine? • How to get started • Some demos
30. Kubernetes is Open Source Your help is needed! http://kubernetes.io https://github.com/kubernetes/kubernetes Slack: #kubernetes-users @kubernetesio
31. Thank you Stay in touch about.me/omerd Google+: +OmerDawelbeit Twitter: @omerio Blog: omerio.com Slides: https://goo.gl/L9p09u