spring-petclinic/setup.md

Steps

DEVELOP BRANCH PULL BASED

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• Java-based Spring Petclinic application
• Pull request-based development
• Create a multi-stage Dockerfile for the Spring Petclinic application on the develop branch
• Execute Dockerfile Using Command

# Create image command
docker image build -t spc:1.0 .
docker image build -t <your image:tag> (dockerfile name)
# Check if the image was created
docker image ls
# Check if your image is running in a container (for verification purposes)
docker container run -P -d --name mytest spc:1.0
docker container run -P -d --name <container name> <your image:tag>
# Check if the container is running (to verify container status)
docker container ls

• Image Scanning with Trivy
• Now, to scan your image with Trivy, follow these steps:
• First, install Trivy on your VM or EC2 instance.

sudo apt-get install wget apt-transport-https gnupg lsb-release
wget -qO - https://aquasecurity.github.io/trivy-repo/deb/public.key | gpg --dearmor | sudo tee /usr/share/keyrings/trivy.gpg > /dev/null
echo "deb [signed-by=/usr/share/keyrings/trivy.gpg] https://aquasecurity.github.io/trivy-repo/deb $(lsb_release -sc) main" | sudo tee -a /etc/apt/sources.list.d/trivy.list
sudo apt-get update
sudo apt-get install trivy -y

After Trivy is installed, scan your image using the following command:

trivy image spc:1.0
trivy image <image:tag>

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RELEASE BRANCH PUSH BASED

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• Push Based Release
• Multiple developers have made changes, so we will scan the Docker image again.
• On the release branch, scan the Docker image with Trivy.

After Trivy is installed, use the following command:

trivy image spc:1.0
trivy image <image:tag>

• The output will show vulnerabilities or reports.
• Pushing the Image to a Registry
• Once the image scan is completed, we can push the image to a registry such as Docker Hub, ECR, or ACR.

To push to Docker Hub, follow these steps:

docker login
docker image tag <docke image> <repousename>/<reponame>:<tag>
docker image tag spc:1.0 longflew/javaimagecicd:1.0
docker image push longflew/javaimagecicd:1.0

Note: Ensure k8s Cluster(AKS or EKS) will be created

Installing helm

• Refer Here for installing Helm
• Once installation completed run the following commands
• To Create a new helm chart repo helm create <your chat> helm create spc-chart
• Deploy the application in k8s using helm , the command will be helm install <release name> <chart name> helm install spc-release spc-chart
• Check the appliocation running or not using the k8s commands

kubectl get po
kubectl get svc

• Take the IP or DNS of the service and open new Browser and paste the IP or DNS.

Upgrade docker image in helm

• Whenever we upgrade the Docker image in Helm, the deployment manifest file is also automatically updated with the new image
• After making further changes, we updated the values.yaml file to modify the image tag.
• use the following command:

# docker image upgrade 
helm upgrade spc-release spc-chart -f values.yaml --set image.tag=new-image-tag

# Verify the Upgrade
helm get all <release name>
helm get all spc-release