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@saturnism #springio15 #kubernetes Kubernetes With Spring Boot Microservices

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@saturnism #springio15 #kubernetes Ray Tsang Developer Advocate twitter: @saturnism github: saturnism © 2015 Ray Tsang

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@saturnism #springio15 #kubernetes Ray Tsang Enterprise Architect Open Source Traveler flickr: saturnism © 2015 Ray Tsang

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@saturnism © 2015 Ray Tsang

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@saturnism © 2015 Ray Tsang

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@saturnism #springio15 #kubernetes Spring Boot + Groovy + Microservices? Remember Josh’s Tweet? https://twitter.com/starbuxman/status/580517687006216193

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@saturnism #springio15 #kubernetes Demo Application Hello World UI Hello World Service Redis session replication greeting

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@saturnism #springio15 #kubernetes Old way: Shared machines kernel libs app app app No isolation No namespacing Common libs Highly coupled apps and OS app

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@saturnism #springio15 #kubernetes App Server libs app app app app Old way: Java No isolation No namespacing Common libs - shouldn’t really happen in Java apps...

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@saturnism #springio15 #kubernetes Spring Boot + Containers A good match!

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@saturnism #springio15 #kubernetes Old way: Virtual machines Good isolation Expensive and inefficient Still highly coupled to the guest OS Hard to manage app libs kernel libs app app kernel app libs libs kernel kernel

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@saturnism #springio15 #kubernetes New way: Containers libs app kernel libs app libs app libs app

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@saturnism #springio15 #kubernetes Lightweight

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@saturnism #springio15 #kubernetes Process isolation CPU, Memory, Network, Filesystem, ...

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@saturnism #springio15 #kubernetes Static binaries no library dependencies

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@saturnism #springio15 #kubernetes Runs on any machine physical, virtual, cloud - OS agnostic

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@saturnism #springio15 #kubernetes Write once - run everywhere! Development, Test, Staging, Production...

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@saturnism #springio15 #kubernetes Containerize Dockerfile

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@saturnism #springio15 #kubernetes Containerize mvn docker:build

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@saturnism #springio15 #kubernetes Let’s run the container! docker run -ti -p 8080:8080 spring-boot-demo

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@saturnism #springio15 #kubernetes Redis container docker run --rm -ti --name redis redis

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@saturnism #springio15 #kubernetes Microservice container docker run --rm -ti --name helloworldservice helloworld-service-demo

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@saturnism #springio15 #kubernetes Link containers docker run -ti --rm --link redis:redis --link helloworldservice:helloworldservice, -p 8080:8080 helloworld-ui-demo:latest

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@saturnism #springio15 #kubernetes Docker Compose docker-compose up

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@saturnism #springio15 #kubernetes Everything at Google runs in containers Launch over 2 billion containers per week.

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@saturnism #springio15 #kubernetes More than one... libs app kernel libs app libs app libs app libs app kernel libs app libs app libs app libs app kernel libs app libs app libs app

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@saturnism #springio15 #kubernetes Enter Kubernetes Greek for “Helmsman”; also the root of the word “Governor” • Container orchestrator • Runs Docker containers • Supports multiple cloud and bare- metal environments • Inspired and informed by Google’s experiences and internal systems • Open source, written in Go Manage applications, not machines

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@saturnism #springio15 #kubernetes Kubernetes cluster libs app kernel libs app libs app libs app libs app kernel libs app libs app libs app libs app kernel libs app libs app libs app Kubernetes Master

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@saturnism #springio15 #kubernetes Distributed process scheduler cluster of machines as one!

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@saturnism #springio15 #kubernetes Open source community Version 0.16 Hosted on GitHub 327+ contributors 10,000+ commits 7,000+ GitHub stars CoreOS HP IBM Mesosphere Microsoft Project Partners Pivotal Red Hat SaltStack VMWare kubernetes.io

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@saturnism #springio15 #kubernetes Pod Group of containers Live and die together Shared network interface Pod App Log Collector ...

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@saturnism #springio15 #kubernetes Pod networking Pod IPs are routable • Docker default is private IP Pods can reach each other without NAT • even across nodes No brokering of port numbers This is a fundamental requirement • several SDN solutions

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@saturnism #springio15 #kubernetes Pod networking 10.1.1.0/24 10.1.1.93 10.1.1.113 10.1.2.0/24 10.1.2.118 10.1.3.0/24 10.1.3.129

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@saturnism #springio15 #kubernetes Labels Label anything Name-value pair Make your own Pod App Log Collector ... type = Frontend version = 1.0

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@saturnism #springio15 #kubernetes Replication controllers Replication Controller Replicas → 2 Pod App Log Collector ... type = Frontend version = 1.0 Pod App Log Collector ... type = Frontend version = 1.0

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@saturnism #springio15 #kubernetes Replication controllers Replication Controller Replicas → 1 Pod App Log Collector ... type = Frontend version = 1.0 Pod App Log Collector ... type = Frontend version = 1.0

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@saturnism #springio15 #kubernetes Replication controllers node 1 f0118 node 3 node 4 node 2 d9376 b0111 a1209 Replication Controller - Desired = 4 - Current = 4

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@saturnism #springio15 #kubernetes Replication controllers node 1 f0118 node 3 node 4 node 2 d9376 b0111 a1209 Replication Controller - Desired = 4 - Current = 4

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@saturnism #springio15 #kubernetes Replication controllers node 1 f0118 node 3 node 4 b0111 a1209 Replication Controller - Desired = 4 - Current = 3

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@saturnism #springio15 #kubernetes Replication controllers node 1 f0118 node 3 node 4 a1209 Replication Controller - Desired = 4 - Current = 4 b0111 c9bad

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@saturnism #springio15 #kubernetes Services Replication Controller Replicas → 2 Pod frontend Pod type = Frontend version = 1.0 Pod type = Frontend version = 1.0 Service Label selectors: version = 1.0 type = Frontend

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@saturnism #springio15 #kubernetes Let’s deploy the microservices! Demo effect time

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@saturnism #springio15 #kubernetes Docker Repository DockerHub or … Private Repository (e.g., gcr.io)

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@saturnism #springio15 #kubernetes DevOps with Kubernetes

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@saturnism #springio15 #kubernetes Versioning container image docker tag spring-boot-demo spring-boot-demo:1.0

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@saturnism #springio15 #kubernetes Staging vs. production Use labels - deploy in the same infrastructure

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@saturnism #springio15 #kubernetes Canary Use service, and replication controllers to canary new versions

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@saturnism #springio15 #kubernetes Rolling upgrade Similar to canary, but slowly let the new version take over

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@saturnism #springio15 #kubernetes Rollback Super simple with versioned containers

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@saturnism #springio15 #kubernetes Vagrant export KUBERNETES_PROVIDER=vagrant curl -sS https://get.k8s.io | bash Google Container Engine - Alpha http://cloud.google.com/container-engine http://kubernetes.io/gettingstarted/

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@saturnism #springio15 #kubernetes Tips and Tricks

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@saturnism #springio15 #kubernetes Service discovery Read service IP addresses via environmental variables

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@saturnism #springio15 #kubernetes Test locally! Set environmental variables REDIS_PORT=tcp://localhost:6379 spring run .

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@saturnism #springio15 #kubernetes SecureRandom - slow =( Use a different source -Djava.security.egd=file:/dev/urandom

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@saturnism #springio15 #kubernetes Clean up disk spaces Every image, layer, and, even containers litters docker rm $(docker ps -a -q) docker rmi $(docker images -q --filter dangling=true)

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@saturnism #springio15 #kubernetes Try out Google Container Engine https://cloud.google.com/container-engine/

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@saturnism #springio15 #kubernetes Thanks! kubernetes.io http://bit.ly/1QLg5E1