Kubernetes 101and Fun
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 1
About me
Mario-Leander ReimerChief Technologist, QAware [email protected]
twitter://@LeanderReimerhttp://github.com/lreimerhttp://speakerdeck.com/lreimerhttp://www.qaware.de
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 2
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
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 4
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 5
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
Cloud Native Stack required!
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 7
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 8
Cloud Native Stack using Kubernetes.
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 9
Kubernetes 101
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 10
Local or Cloud setup of Kubernetes
echo "- Use Vagrant for local K8s setup"export KUBERNETES_PROVIDER=vagrantexport NUM_NODES=1
echo "- The default provider is GCE"export KUBERNETES_PROVIDER=gceexport KUBE_GCE_ZONE=europe-west1-dexport NUM_NODES=4
echo "- Another possible provider is AWS"export KUBERNETES_PROVIDER=awsexport KUBE_AWS_ZONE=eu-central-1aexport NODE_SIZE=t2.small
curl -sS https://get.k8s.io | bash
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 11
Overview of Kubernetes Architecture
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 12
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
Deployment definition as YAMLapiVersion: extensions/v1beta1kind: Deploymentmetadata: name: hello-worldspec: 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
Service definition as YAML
apiVersion: v1kind: Servicemetadata: name: hello-world labels: tier: webspec: # 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
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
Demo time.
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 17
The Cloud Native Zwitscher Showcase
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 18
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 19
The source code.
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 20
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
Example Dockerfile for Zwitscher Service
FROM qaware-oss-docker-registry.bintray.io/base/alpine-k8s-ibmjava8:8.0-3.10MAINTAINER QAware GmbH <[email protected]>
RUN mkdir -p /opt/zwitscher-service
COPY build/libs/zwitscher-service-1.1.0.jar /opt/zwitscher-service/zwitscher-service.jarCOPY 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
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
Kubernetize: single or multi-container pods?
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 24
Possible variation using K8s infrastructure.
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 25
Define a deployment per container.apiVersion: extensions/v1beta1kind: Deploymentmetadata: name: zwitscher-servicespec: 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
Define a service per deployment.
apiVersion: v1kind: Servicemetadata: name: zwitscher-service labels: zwitscher: servicespec: # 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
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
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
Use Retry mechanism for fail-fast behavior.# bootstrap.ymlspring: 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
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
Let's have some fun!
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 32
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
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 34
Q & A
| ContainerCon Europe 2016 | created with ☁ and ☕ by @LeanderReimer 35