K u be r ne t es 101 a n d F un | C ontain e rCon E urope 20 1 6 | c - - PowerPoint PPT Presentation

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Jan 26, 2023 529 likes •886 views

K u be r ne t es 101 a n d F un | C ontain e rCon E urope 20 1 6 | c reated wi t h a n d by @L eander R eimer 1 A b ou t m e M ario -L eander R eimer C hief T echnol o gist , Q Aware G mbH m ario -l eander .r eimer @q aware .d e t witter

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Kubernetes 101 and Fun

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 1

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About me

Mario-Leander Reimer Chief Technologist, QAware GmbH mario-leander.reimer@qaware.de twitter://@LeanderReimer http://github.com/lreimer http://speakerdeck.com/lreimer http://www.qaware.de

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 2

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Code and article series are here ...

4 https://github.com/qaware/cloud-native-zwitscher/ 4 http://www.qaware.de/fjleadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-1.pdf 4 http://www.qaware.de/fjleadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-2.pdf 4 http://www.qaware.de/fjleadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-3.pdf 4 http://www.qaware.de/fjleadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-4.pdf

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 3

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| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 4

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| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 5

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Design principles for Cloud Native Applications

4 Design for Performance: responsive; concurrency; effjciency. 4 Design for Automation: automate dev tasks & ops tasks. 4 Design for Resiliency: fault-tolerant; self-healing. 4 Design for Elasticity: dynamically scale; be reactive. 4 Design for Delivery: short roundtrips; automated delivery. 4 Design for Diagnosability: cluster-wide logs, traces, metrics.

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Cloud Native Stack required!

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| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 8

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Cloud Native Stack using Kubernetes.

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 9

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Kubernetes 101

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 10

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Overview of Kubernetes Architecture

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 11

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Main Kubernetes concepts

4 Services are an abstraction for a logical set of Pods. 4 Pods are the smallest deployable units

f computing.

4 Deployments provide declarative updates for Pods and RCs. 4 Replica Sets ensure specifjed number

f Pods are running.

4 Labels are key/value pairs attached to

bjects used for identifjcation.

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 12

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Deployment defjnition as JSON

apiVersion: extensions/v1beta1 kind: Deployment metadata: name: hello-world spec: replicas: 1 template: metadata: labels: tier: web spec: containers:

name: hello-world

image: "nginx:alpine" ports:

containerPort: 80

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 13

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Service defjnition as JSON

apiVersion: v1 kind: Service metadata: name: hello-world labels: tier: web spec: # use NodePort here to be able to access the port on each node # use LoadBalancer for external load-balanced IP if supported type: NodePort ports:

port: 80

selector: tier: web

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 14

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Local or Cloud setup of Kubernetes

echo "- Use Vagrant for local K8s setup" export KUBERNETES_PROVIDER=vagrant export NUM_NODES=1 echo "- The default provider is GCE" export KUBERNETES_PROVIDER=gce export KUBE_GCE_ZONE=europe-west1-d export NUM_NODES=4 echo "- Another possible provider is AWS" export KUBERNETES_PROVIDER=aws export KUBE_AWS_ZONE=eu-central-1a export NODE_SIZE=t2.small curl -sS https://get.k8s.io | bash

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 15

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Hello World with Kubernetes

$ kubectl cluster-info $ kubectl get nodes $ kubectl run hello-world --image=nginx:alpine --replicas=1 --port=80 $ kubectl expose deployment hello-world --type="NodePort" $ kubectl get deployments,pods $ kubectl describe pod [NAME] $ kubectl delete deployment hello-world $ kubectl create -f nginx.yml

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 16

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Demo time.

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The Cloud Native Zwitscher Showcase

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| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 19

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The source code.

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Dockerize it!

4 Know your base image!!! 4 The Alpine image is too thin for K8s + Spring. 4 You need Bash, DNS and Java. 4 Use a Server JRE. 4 Better build your own image.

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Example Dockerfjle for Zwitscher Service

FROM qaware-oss-docker-registry.bintray.io/base/debian8-jre8 MAINTAINER QAware GmbH <qaware-oss@qaware.de> RUN mkdir -p /opt/zwitscher-service COPY build/libs/zwitscher-service-1.0.1.jar /opt/zwitscher-service/zwitscher-service.jar COPY src/main/docker/zwitscher-service.* /opt/zwitscher-service/ RUN chmod 755 /opt/zwitscher-service/zwitscher-service.* EXPOSE 8761 ENTRYPOINT exec /opt/zwitscher-service/zwitscher-service.sh

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 22

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Build, test, tag and push Docker images.

... $ docker built -t zwitscher-service:1.0.1 . $ docker-compose up ... $ docker tag zwitscher-service:1.0.1 \ qaware-oss-docker-registry.bintray.io/zwitscher/zwitscher-service ... $ docker push qaware-oss-docker-registry.bintray.io/zwitscher/zwitscher-service

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 23

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Kubernetize: single or multi-container pods?

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Possible variation using K8s infrastructure.

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 25

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Defjne a deployment per container.

apiVersion: extensions/v1beta1 kind: Deployment metadata: name: zwitscher-service spec: replicas: 1 template: metadata: labels: zwitscher: service spec: containers:

name: zwitscher-service

image: "qaware-oss-docker-registry.bintray.io/zwitscher/zwitscher-service:1.0.1" ports:

containerPort: 8080

env:

name: EUREKA_HOST

value: zwitscher-eureka

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 26

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Defjne a service per deployment.

apiVersion: v1 kind: Service metadata: name: zwitscher-service labels: zwitscher: service spec: # use NodePort here to be able to access the port on each node # use LoadBalancer for external load-balanced IP if supported type: NodePort ports:

port: 8080

selector: zwitscher: service

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 27

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Be careful using resource constraints.

resources: requests: memory: "128Mi" cpu: "250m" limits: memory: "192Mi" cpu: "500m"

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 28

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Use liveness probes on Actuator endpoints.

livenessProbe: httpGet: path: /admin/health port: 8080 initialDelaySeconds: 90 timeoutSeconds: 30

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Use Retry mechanism for fail-fast behavior.

# bootstrap.yml spring: application: name: zwitscher-service cloud: config: enabled: true failFast: true retry: initialInterval: 1500 maxInterval: 5000 maxAttempts: 5 multiplier: 1.5 discovery: enabled: true serviceId: ZWITSCHER-CONFIG

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 30

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Deployment time!

$ kubectl create -f zwitscher-eureka/k8s-zwitscher-eureka.yml $ kubectl create -f zwitscher-config/k8s-zwitscher-config.yml $ kubectl create -f zwitscher-service/k8s-zwitscher-service.yml $ kubectl create -f zwitscher-board/k8s-zwitscher-board.yml $ kubectl create -f zwitscher-edge/k8s-zwitscher-edge.yml $ kubectl create -f zwitscher-monitor/k8s-zwitscher-monitor.yml $ kubectl get deployments,pods,services $ kubectl delete -f k8s-zwitscher.yml

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 31

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The Kubepad in action

4 A MIDI controller 4 Display deployments and pods 4 Scale deployments 4 Written in fancy Kotlin 4 Also works for DC/OS 4 https://github.com/qaware/ kubepad

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 32

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| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 33

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Let's have some fun!

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 34

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Q & A

| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 35