microservices-example-kube

About the project:

This project is a kubernetes translation derived from this project.

This simple reservation application uses a queue manager for all reservation tasks like create, update, and delete. And use a more direct approach to get the data from the DB.

How it all works

graph TD;
GUI(GUI) -->|GET| Querier;
GUI(GUI) -->|POST,PUT,DELETE| Producer;

Querier(Querier) --> ORM;
Kafka --> Producer;
Kafka --> Consumer;
ORM --> Database;
Consumer --> ORM;

Loading

Service Table

Container	Port	Purpose
ui	8084	gui
cons	--	get messages (tasks) from kafka and forwards to orm
orm	5431	used as a mitigator for DB
prod	8080	receive http request from ui and create messages (tasks) via kafka
querier	8081	receive http request from ui and forwards a query via orm
kafka	9092, 8082, 8083	message bus
zookeeper	2181	?
db	5432	data base

Prerequisite:

K3S:

In order to simplify the containers build process we decided to use kubernetes.
The k3s is a lite wait kubernetes with docker as the container runtime.

To install k3s:

curl -sfL https://get.k3s.io | sh -s - --docker

Configure local kubctl to work with container k3s

echo "export KUBECONFIG=/etc/rancher/k3s/k3s.yaml" >> ~/.bashrc

Load the config

exec bash

Getting Started:

Get the source code:

git clone https://github.com/davidswisa/microservices-example-kube.git

To run the services:

make run

Now you can open the UI using this link:

http://<MACHINE-IP>:8084

How can be extended:

• can add upgared flow for a new pod version
• can be a base for helm charts project

For further reading:

• converting docker-compose to kubernetes