🦌 k8s-3tier-webapp

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This is a sample web application based on k8s with a focuse on connecting components, setting up k8s resources, and deploying microservices. This is for PoC only and not for use in a production environment.

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Tier	Name	Description
1	Frontend	Web page, Application logic, Static file
2	Backend	Database, Cache, Messaging
3	Management	Monitoring, CI/CD, Tracing

Concepts

• k8s resources defined with yaml manifests
• Test automation utilizing Github Actions
• Automated unit, end-to-end, performance, recovery, & security tests
• Provide monitoring services for observability
• Improve application quality using public CI services

Features

• All docker components run on k8s
• Utilizes Quarkus, a full-stack, Kubernetes-native, Java App Framework tailored for OpenJDK & GraalVM to ensure a small memory footprint and reduced boot time.
• k8s resources defined in yaml manifests
• Utilizes only public, non commercial software
• Utilizes Github Actions for build, test, release

Requirements

Installed CLI commands.

• 💻 docker
• 💻 kubectl
• 💻 minikube

Run on Minikube

Mac

minikube config set memory 121288
minikube config set cpus 6
minikube config set disk-size 80g
minikube start
minikube addons enable ingress
kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission

eval $(minikube docker-env)

Windows

minikube config set memory 121288
minikube config set cpus 6
minikube config set disk-size 80g
minikube start
minikube addons enable ingress
kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission

minikube docker-env --shell powershell | Invoke-Expression

Build & Apply

apply.sh supports kubectl apply to k8s clusters.

./kubernetes/bin/apply.sh

Web Console Access

Add hosts

Add IP, domain in /etc/hosts

echo `minikube ip` k8s.3tier.webapp openliberty.minikube spring.minikube api.server.minikube \
rabbitmq.management.minikube jenkins.minikube alertmanager.minikube prometheus.minikube \
grafana.minikube jupyter.minikube hazelcast.manager.minikube activemq.management.minikube \
jaeger.minikube argo.minikube >> /etc/hosts

Web Console list

Service	URL
Top Page	http://k8s.3tier.webapp/
Open Liberty	http://openliberty.minikube
Spring Boot	http://spring.minikube
Rabbitmq Management Console	http://rabbitmq.management.minikube
Activemq Management Console	http://activemq.management.minikube

Component

Application

Java based web application for application

Kubernetes

Yaml based kubernetes manifests for kubernetes

Monitoring

Set up monitoring for Tier 3

Contribution

1. Fork this repo
2. Create a feature branch named like feature/enhancement from master branch
3. Commit your changes
4. Rebase your local changes against the master branch
5. Create new Pull Request