Kubernetes demo

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Worldcup

Worldcup is an application to be tested in Kubernetes environment. The champion is set in champ environment variable.

Build

You should build and deploy it into your own registry.

docker build . -t rodriguezarata/worldcup:0.1
docker push rodriguezarata/worldcup:0.1

Deploy in docker

docker run -d --env champ=francia --name worldcup -p 80:80 rodriguezarata/worldcup:0.1

Deploy pod in Kubernetes

kubectl run worldcup --image rodriguezarata/worldcup:0.1 --env="champ=francia"

Deploy as deployment

kubectl apply -f manifest.yaml

Update env variable

You will replace the current champ value, after that, you will need to restart the pods.

kubectl edit configmaps worldcup-configmap
kubectl rollout restart deployment worldcup-deployment

Undo a previous rollout

kubectl rollout undo deployment worldcup-deployment

Check your logs

kubectl describe pods worldcup-deployment-85b445ccb5-8lfj9
kubectl logs deployments/worldcup-deployment -f

See balancing requests to pods

You will generate a pod to connect to the service in the cluster

kubectl run -i --tty --rm debug --image=alpine --restart=Never -- sh
apk update
apk upgrade
apk add curl
watch curl 'worldcup-service.default.svc/host'