Demo notes

Set up

Create a kind cluster with correct port mapping

kind create cluster --config kind.yml

Set the Kubernetes context

kubectl config set-context --current --namespace=zerodowntime

Get back to the v1 of the application

git checkout 1.0

Build the image

The build will load the image to the Docker daemon.

./mvnw clean compile com.google.cloud.tools:jib-maven-plugin:dockerBuild

Load it into kind.

kind load docker-image hazelcast/hzshop:1.0

Get to the v2 of the application

git checkout master

Build the image and load it to the Docker daemon

./mvnw clean compile com.google.cloud.tools:jib-maven-plugin:dockerBuild

Load it into kind.

kind load docker-image hazelcast/hzshop:2.0

Load the remaining images in kind

kind load docker-image mysql:8.0
kind load docker-image hazelcast/forward:2.0

Execution

Schedule common parameters

kubectl apply -f infrastructure/kube/parameters.yml

Schedule the original database (blue)

kubectl apply -f infrastructure/kube/blue.yml

Schedule the v1 version of the application

kubectl apply -f infrastructure/kube/application.yml

Use the application to add products to the cart of any of the customers

It’s possible to add products to more than one cart!

Schedule the target database (green)

kubectl apply -f infrastructure/kube/green.yml

Schedule the CDC job from blue to green

kubectl apply -f infrastructure/kube/forward.yml

Schedule the v2 version of the application

kubectl apply -f infrastructure/kube/application2.yml

Continue adding products to the cart

At one point, you’ll notice the node you were on has changed but keeping you connected with your cart!