Kubernetes 101 and Fun - Speaker Deck

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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 [email protected] 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/fileadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-1.pdf 4 http://www.qaware.de/fileadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-2.pdf 4 http://www.qaware.de/fileadmin/userupload/QAware-Cloud-Native- Artikelserie-JavaMagazin-3.pdf 4 http://www.qaware.de/fileadmin/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; efficiency. 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. 4 The Twelve-Factor App Principles (https://12factor.net) | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 6

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Cloud Native Stack required! | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 7

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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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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 11

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Overview of Kubernetes Architecture | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 12

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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 of computing. 4 Deployments provide declarative updates for Pods and RCs. 4 Replica Sets ensure specified number of Pods are running. 4 Labels are key/value pairs attached to objects used for identification. | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 13

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Deployment definition as YAML apiVersion: extensions/v1beta1 kind: Deployment metadata: name: hello-world spec: replicas: 1 template: metadata: labels: tier: web spec: containers: - name: hello-world image: "nginx" ports: - containerPort: 80 | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 14

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Service definition as YAML 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 15

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Hello World with Kubernetes $ kubectl cluster-info $ kubectl get nodes $ kubectl run hello-world --image=nginx --replicas=1 --port=80 $ kubectl expose deployment hello-world $ kubectl get deployments,services,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. | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 17

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The Cloud Native Zwitscher Showcase | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 18

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

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The source code. | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 20

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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. | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 21

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Example Dockerfile for Zwitscher Service FROM qaware-oss-docker-registry.bintray.io/base/alpine-k8s-ibmjava8:8.0-3.10 MAINTAINER QAware GmbH RUN mkdir -p /opt/zwitscher-service COPY build/libs/zwitscher-service-1.1.0.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 8080 CMD /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:1.1.0 . $ docker-compose up ... $ docker tag zwitscher-service:1.1.0 \ 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? | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 24

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Possible variation using K8s infrastructure. | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 25

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Define 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:1.1.0" ports: - containerPort: 8080 env: - name: EUREKA_HOST value: zwitscher-eureka | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 26

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Define 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: # required resources for a Pod to be started requests: memory: "128Mi" cpu: "250m" # the Pod will be restarted if limits are exceeded limits: memory: "192Mi" cpu: "500m" | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 28

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Use liveness and readiness probes with Actuator. livenessProbe: httpGet: path: /admin/health port: 8080 initialDelaySeconds: 90 timeoutSeconds: 30 readinessProbe: httpGet: path: /admin/info port: 8080 timeoutSeconds: 30 | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 29

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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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Let's have some fun! | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 32

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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 33

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

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Q & A | ContainerCon Europe 2016 | created with ‘ and ☕ by @LeanderReimer 35