Workshop: Kubernetes for Developers

Workshop at Kubernetes Philly

Presenter

Ross Kukulinski

Workshop Description

Kubernetes accelerates technical and business innovation through rapid development and deployment of applications. Learn how to deploy, scale, and manage your applications in a containerized environments using Kubernetes.

In this 60-minute workshop, Ross Kukulinski will review fundamental Kubernetes concepts and architecture and then will show how to containerize and deploy a multi-tier web application to Kubernetes.

Topics that will be covered include:

• Working with the Kubernetes CLI (kubectl)

• Pods, Deployments, & Services

• Manual & Automated Application Scaling

• Troubleshooting and debugging

• Persistent storage

Workshop Slides

Workshop Slides - TBD
Workshop Video - TBD
Workshop Screencast - TBD

Background Reading / Videos

https://vimeo.com/172626818 http://kubernetes.io/docs/hellonode/ http://www.slideshare.net/kuxman/nodejs-and-containers-go-together-like-peanut-butter-and-jelly

Outline

• Welcome & Introductions
• Installing minikube & kubectl
• Kubernetes Overview
• Cloudy Time Machine (CTM) Overview
• Deploy CTM to minikube / Kubernetes

Deploying Cloudy Time Machine to Kubernetes

Installing minikube

Follow instructions at https://github.com/kubernetes/minikube/releases

For OSX:

curl -Lo minikube https://storage.googleapis.com/minikube/releases/v0.13.0/minikube-darwin-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/

minikube hello world

minikube start

kubectl run hello-minikube --image=gcr.io/google_containers/echoserver:1.4 --port=8080

kubectl expose deployment hello-minikube --type=NodePort

kubectl get pod

curl $(minikube service hello-minikube --url)

minikube stop

Working with minikube

minikube start

minikube stop

minikube service <servicename>

minikube dashboard

minikube ip

minikube docker-env

minikube logs

Working with kubectl

kubectl config current-context

kubectl config use-context minikube

kubectl get nodes

kubectl describe node <nodeid>

kubectl get pods

kubectl get namespaces

kubectl -n kube-system get pods

kubectl -n kube-system get services

kubectl -n kube-system get svc

kubectl -n kube-system describe svc kubernetes-dashboard

kubectl run -i -t busybox --image=busybox --restart=Never

Deploy CTM frontend manually

The CTM frontend application can run standalone, so let's start with that.

kubectl run frontend --image=quay.io/cloudytimemachine/frontend:25f9df2e9c991745a02ef5fdd249a542c53d6d8a --image-pull-policy=IfNotPresent

kubectl get pods

kubectl get events --watch

kubectl describe pod <pod id>

kubectl port-forward <pod id> 3000:80

curl localhost:3000

kubectl exec -ti <frontend pod> /bin/sh

vi index.html

curl localhost:3000

kubectl expose deployment frontend --port=80 --target-port=3000 --name=frontend

kubectl describe svc frontend

kubectl scale deployment/frontend --replicas=2

kubectl describe svc frontend

kubectl edit pod <frontend pod> # Edit label to remove from the pool

kubectl get pods

kubectl edit svc/frontend # Change to type: NodePort

minikube service frontend

kubectl delete deployment/frontend svc/frontend

kubectl delete pod <frontend pod>

Deploy Frontend using declarative syntax

atom deploy/frontend.yml

kubectl create -f deploy/frontend.yml

kubectl get pods

kubectl get svc

Remind audience about architecture

Deploy API service using declarative syntax

API Service depends on Redis and RethinkDB, so lets create them first.

atom deploy/redis.yml

kubectl create -f deploy/redis.yml

kubectl get pods

kubectl port-forward <redis pod> 6379:6379

redis-cli

Kubectl can also create from URL (Similar to curl | bash)

kubectl create -f https://raw.githubusercontent.com/rosskukulinski/kubernetes-rethinkdb-cluster/master/rethinkdb-quickstart.yml

kubectl get pods --watch

minikube service rethinkdb-admin

atom deploy/api.yml

kubectl create -f deploy/api.yml

kubectl get pods

kubectl get svc

kubectl logs <api pod> --tail=10 -f

kubectl logs <api pod> --tail=10 -f | bunyan

Deploy Gateway service to expose frontend & api

atom deploy/gateway.yml

kubectl create -f deploy/gateway.yml

kubectl get configmap

kubectl get pods

kubectl describe svc gateway

minikube service gateway

Navigate to /api/snapshots --> See empty array

Request snapshot for xkcd.com, gets queued in Redis

Deploy worker-screenshot service

atom deploy/worker-screenshot.yml

kubectl create -f deploy/worker-screenshot.yml

kubetctl get pods --watch

kubectl logs <worker pod> -f | bunyan

Request additional snapshots, see the queue size increase

kubectl scale deployment/worker-screenshot --replicas=3

kubectl get pods --watch

Tear everything down

kubectl delete namespace default --cascade=true

Bring it back up

make
kubectl create -f deploy/all-in-one.yml

Back to slides to wrap up

kubernetes-101-for-devs