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Bootstrap project to work with microservices using Java

Watch the videos demonstrating the project

Read about the project here

The idea of this project is to provide you a bootstrap for your next microservice architecture using Java. we are addressing main challenges that everyone faces when is starting with microservices. This project will definitely help you get an understand about microservices world and save you a lot of time in setting your initial microservice architecture.

Basically, if you are interested in microservice, either study or want to implement microservice approach at your work, this project is for you!

Microservice principles addressed:

• Scalability
• Availability
• Resiliency
• Independent, autonomous
• Decentralized governance
• Failure isolation
• Auto-Provisioning
• Continuous delivery through DevOps

Microservice patterns:

• Circuit Breakers
• API Gateway
• Command Query Responsibility Segregation (CQRS)
• Saga Pattern
• Event Sourcing
• Log Aggregation
• Health Check
• Service Discovery
• External Configuration
• Distributed authentication

Free Advanced Java Course

I am the author of the Advanced Java for adults course. This course contains advanced and not conventional lessons. In this course, you will learn to think differently from those who have a limited view of software development. I will provoke you to reflect on decisions that you take in your day to day job, which might not be the best ones. This course is for middle to senior developers and we will not teach Java language features but how to lead complex Java projects.

This course's lectures are based on a Trading system, an opensource project hosted on my Github.

Technologies that you will see in this system:

Spring Boot, Spring Data, Spring Cloud Eureka, Load Balancing with Ribbon, Declarative REST Clients with Feign, Software Circuit Breakers with Hystrix, Administrating using Spring admin,Log management with Elastic search, Logstash and Kibana (ELK), Server load balancing with Nginx, Infrastructure management with Docker-compose, JMX application monitoring, Security with Spring Security OAuth, Oauth2 with JWT, Aspect Oriented Programing, Distributed events with Kafka, Spring Stream Maven Multimodule project, Event Sourcing, CQRS, REST, Web Sockets, Continuous deploy with Jenkins, and all developed using Java 8.

How to use

• run package-projects.sh
• run docker-orchestrate.sh
• docker-compose -p todo up

Continuous deploy using Jenkins Pipeline

We have created a docker image in order to have continuous deploy in our project here.

This image will contain all necessary to build our project, create the Docker images and deploy on AWS using ECS containers.

To make this integration easy, we have added the Jenkinsfile with the steps necessary to have the Docker image built. To use it, you will need just to configure a Job on Jenkins using Pipeline plugin and paste the content of the Jenkinsfile in the Pipeline script box. Have a look at this video to check how to work with Jenkins pipeline

Deploy on AWS

• Create your credentials on AWS
• Create your cluster on AWS console
• Have the build-deploy container running (Checkout in the project's README how to do it)
• Access Jenkins painal
• Create a pipeline job
• Run the Job

Accessing the services

• Authenticate -> curl -X POST -vu todo-app:123456 http://localhost:8017/oauth/token -H "Accept: application/json" -d "password=1234&[email protected]&grant_type=password&scope=write&client_secret=123456&client_id=todo-app"

• Get data using the access_token -> localhost:8018/accounts?access_token={access_token} or curl -H "Authorization: Bearer $TOKEN" "localhost:8018/path"

Scaling

NGINX will be configured for browser caching of the static content and Load balance. For that we will need to scale our App Gateway and update manually the ports in default.conf file, in the upstream configuration section:

upstream backend {
  server gateway:8018;
  server gateway:DYNAMICPORT;
  server gateway:DYNAMICPORT;
}

And we will run the compose file with --scale parameter:

docker-compose -f proxy-docker-compose.yml -p todo up --scale gateway=2

URLs

Monitoring stream - http://localhost:8022/turbine.stream

To-dos http://localhost:8015/todos

Users http://localhost:8016/accounts

Eureka server - http://localhost:8010/

Config server - http://localhost:8888/

Boot admin - http://localhost:8026

Kimbana - http://localhost:5601

Elasticsearch Info: http://localhost:9200

Elasticsearch Status: http://localhost:9200/_status?pretty

NGINX Status: localhost:8055/nginx_status

docker-compose -p todo up docker-compose -p todo down

OBS

• In order to make ELK work we need to reserve 3GB RAM to docker(docker settings - advanced - memory )
• Have a look at the Readme of each service/ module to see the explanation about it.
• On Kimbana create a filter called filebeat-* to see the logs

Useful Commands

Creating to-do via Curl

curl -d '{"userEmail":"[email protected]", "caption":"post caption", "description":"desc", "priority": 1}' -H "Content-Type: application/json" -X POST http://localhost:8015/todos

Stopping, Starting, Restarting...

# running separated container and link to the network infrastructure
docker run -d -p 8018:8018  --network todo_net --add-host eureka:172.19.0.5 --add-host config:172.19.0.2 todo/reminder-service

# orchestrate start-up of containers, tailing the logs...
docker-compose -p music up -d container-name && docker logs elk --follow # ^C to break

# stopping containers
docker-compose todo stop
docker-compose todo down

# starting containers
docker-compose -p todo up

# removing containers
docker-compose todo rm

Application Startup Issues

# stop / start Tomcat
docker exec -it container-name sh /usr/local/tomcat/bin/startup.sh
docker exec -it container-name sh /usr/local/tomcat/bin/shutdown.sh

# check logs for start-up issues...
docker exec -it container-name cat /usr/local/tomcat/logs/catalina.out
docker logs container-name

Kafka

Inside the Kafka container

# event consume
/opt/kafka/bin/kafka-console-consumer.sh --zookeeper zookeeper:2181 --topic todo-mail --from-beginning

# producer console
/opt/kafka/bin/kafka-console-producer.sh --broker-list kafka:9092 --topic todo-mail

# Listing topics
/opt/kafka/bin/kafka-topics.sh --list --zookeeper zookeeper:2181

# Create topic
/opt/kafka/bin/kafka-topics.sh --create --zookeeper zookeeper:2181 --replication-factor 1 --partitions 1 --topic pcs

Data

#create a new To-Do 
curl -H "Content-Type: application/json" -X POST -d '{"id":161,"caption":"Test caption 3","userEmail":"[email protected]","description":"description 3","createdat":null,"priority":2,"status":"PENDING","version":0,"valid":true}' http://localhost:8015/todos

TODO

• Add private maven repository Artifactory
• Manager services integration through Spring Webflow
• Add Distributed Tracing

That's all. Leave a star if it helped you!