Introduction to Kubernetes and Google Container Engine

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Introduction to Kubernetes and Google Container Engine Omer Dawelbeit | @omerio | +OmerDawelbeit

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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

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Content ● Containers ● Kubernetes ● Container Engine ● Getting Started ● Demo Time ● Wrap Up

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Containers

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What is a container? ● Lightweight environment ● Static application environment ● No external dependencies ● Application isolation ● Reusable, runnable artifacts ● Loosely coupled ● Portable

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Containers vs. VMs

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Kubernetes (k8s) /koo-ber-nay'-tace/ From κυβερνήτης: Greek for "helmsman" or "pilot"

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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

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Containers Orchestration

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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.

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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/

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Cluster Overview ● Pods ● Containers ● Labels ● Replication Controllers ● Services ● Nodes ● Kubernetes Master

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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

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Pods Questions ● How to persist data across container restarts? ● How to create multiple copies of a Pod? ● How can containers reference each other reliably?

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Labels ● Key/value pairs (tier=frontend, app=myapp) ● Metadata with semantic meaning ● Membership identifier (services & rc) ● Queryable by Selectors (grouping)

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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

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Replication Controllers

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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

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Services

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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"

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Google Container Engine

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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

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Google Container Engine Overview

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Getting Started

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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

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Demo Time

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Deploying a Graphviz cluster ● Demo Slides

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Wrap Up

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What we have covered ● Why are containers so popular ● What is Kubernetes? ● What is Google Container Engine? ● How to get started ● Some demos

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Kubernetes is Open Source Your help is needed! http://kubernetes.io https://github.com/kubernetes/kubernetes Slack: #kubernetes-users @kubernetesio

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Thank you Stay in touch about.me/omerd Google+: +OmerDawelbeit Twitter: @omerio Blog: omerio.com Slides: https://goo.gl/L9p09u