hystrix-bootiful-session

Example for springsession and hystrix in kubernetes.

Abstract

This example shows how to use springsession and hystrix in kubernetes. The springsession data is stored in redis. To discover all hystrix pods in kubernetes some functionalites from fabric8 are used.

Overview

Required software

To follow the step by step install and test instructions the following software is required:

docker
maven
minikube
redis client (optional)
apache benchmarking tool (optional)

Step by step instructions

Create a local kubernetes cluster with

minikube start

Point your local docker to minikube docker

eval $(minikube docker-env)

Check your docker configuration by runnig

docker images

The following output should be

REPOSITORY                                            TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
gcr.io/google_containers/kubernetes-dashboard-amd64   v1.1.0              sha256:d023c        2 weeks ago         58.65 MB
gcr.io/google-containers/kube-addon-manager-amd64     v2                  sha256:a876f        10 weeks ago        231.1 MB
gcr.io/google_containers/pause-amd64                  3.0                 sha256:99e59        3 months ago        746.9 kB

Now build the example and create the docker image in minikube

mvn package docker:build

To install all pods execute

kubectl create -f deployment

Open the kubernetes dashboard to see if all images are downloaded and all pods are running.

minikube dashboard

Now check whether redis is empty (my minikube is running on 192.168.99.100)

./redis-cli -h 192.168.99.100 keys '*'

The result should be

(empty list or set)

Now call the application and create a session that is stored in redis. Open the browser: http://192.168.99.100:8080/. To see the generated session in redis type

./redis-cli -h 192.168.99.100 keys '*'

The result should look be

1) "spring:session:sessions:expires:622b9577-c948-455e-a3c1-32c89dfd513c"
2) "spring:session:expirations:1470131040000"
3) "spring:session:sessions:622b9577-c948-455e-a3c1-32c89dfd513c"

For an overview of hystrix open the hystrix dashboard. Open the url http://192.168.99.100:8088/monitor/monitor.html?stream=http%3A%2F%2Fturbine-server%2Fturbine.stream in browser. To create load for the hystrix dashboard you can use the apache benchmarking tool

ab -n 1000 -c 4 http://192.168.99.100:8080/

Further steps