Codemotion Rome 2019 Helm demo

What we will do:

• Build backend and frontend Java applications

• Test them with Docker on developer machine

• Run those images in a Kubernetes cluster with yaml files

• Present Helm and run the same Docker images with Helm packages

Repository layout

• helm: helm artifacts
• java: java applications
• yamls: yamls files for Kubernetes

Build Java applications

Build java applications with maven

cd java
for i in backend backend_2 frontend; do (cd $i; mvn clean package); done

Create Docker image for backend

cd java/backend
docker build -t backend:1.0.0 .

Run backend in Docker and extract its ip address

BACKEND=`docker run -d backend:1.0.0`

docker inspect $BACKEND | grep -i IPAddress

Create Docker image for frontend

cd java/frontend
docker build -t frontend:1.0.0 .

Run frontend docker image and link it to backend

FRONTEND=`docker run -d -e BACKEND="http://<backendip>:8080/" frontend:1.0.0`

docker inspect $FRONTEND | grep -i IPAddress

Create updated Docker image for backend

cd java/backend_2
docker build -t backend:1.0.1 .

Push docker images to a local registry

docker tag backend:1.0.0 registry.lan/backend:1.0.0
docker push registry.lan/backend:1.0.0

docker tag frontend:1.0.0 registry.lan/frontend:1.0.0
docker push registry.lan/frontend:1.0.0

docker tag backend:1.0.1 registry.lan/backend:1.0.1
docker push registry.lan/backend:1.0.1

Deploy backend in Kubernetes

cd yamls/backend
kubectl apply -f backend_deployment.yaml
kubectl apply -f backend_service.yaml

Deploy frontend in Kubernetes

cd yamls/fronted
kubectl apply -f frontend_configmap.yaml
kubectl apply -f frontend_deployment.yaml
kubectl apply -f frontend_service.yaml

Deploy updated backend in Kubernetes

cd yamls/backend_2
kubectl apply -f backend_deployment.yaml

Build backend Helm chart

cd helm
helm package backend

Push Helm chart to chartmuseum

Depends on your environment

Update Helm repo

helm repo update

Show available Helm charts to install

helm search

Install Helm chart

helm install chartmuseum/backend [--version 1.0.0]

Build frontend Helm chart

cd helm
helm package frontend

Push Helm chart to chartmuseum

Depends on your environment

Install Helm chart

helm install --set config.backend=http://<backendservice:80>/ chartmuseum/frontend

Build updated backend Helm chart

cd helm
helm package backend

Push Helm chart to chartmuseum

Depends on your environment

Upgrade Helm chart

helm upgrade <releasename> chartmuseum/backend [--version 1.0.1]

Show history of installed chart

helm history <releasename>

Rollback a chart to a previous version

helm rollback <releasename> 1