2_demo_rolling_updates

Rolling-updates with Kubernetes

Prereq

Deploy docker images to hub.docker.com, see Makefile

With minikube

minikube start
kubectl config use-context minikube

kubectl apply -f kube-api-service.yaml

# deployment
kubectl apply -f kube-demo-api.yaml

# notice, it takes longer time due to the initialDelaySeconds
kubectl get po

export SVC_PORT=$(kubectl get service demo-api --output='jsonpath="{.spec.ports[0].nodePort}"' | tr -d '"')

curl $(minikube ip):${SVC_PORT}

# in one terminal window:
watch -n0.3 -x curl -s $(minikube ip):${SVC_PORT}

# in another terminal window
watch -n0.3 -x kubectl get po

# upgrade
kubectl set image  deployment/demo-api app=wojciech11/api-status:2.0.0

How to ensure, we wait for all the request to be closed?

Use:

terminationGracePeriodSeconds: 60

See: traefik-ds.yaml