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springboot-microservices

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# Spring Boot Microservices

## Overview
* The application has been developed using microservice approach.
* We use git monorepo where all microservices are the modules in a single respository.
* Each microservice `product-service` and `review-service` can be built and run independently using Java & Gradle.
* Each microservice can build, test, run, dockerize, deploy & run independently using Docker, Jenkins, and Kubernetes

## Resources 
* [Deployment of Spring Boot Microservices using Docker and Jenkins](https://codingnconcepts.com/spring-boot/deployment-of-microservices-using-docker-and-jenkins/)

## Product-Service
* You should be able to run product-service at port `8081`
* You should be able to access API doc at url `http://localhost:8081` after successful application startup

## Review-Service
* You should be able to run product-service at port `8082`
* You should be able to access API doc at url `http://localhost:8082` after successful application startup
* You can perform `GET` operation without any authentication.
* You need to pass JWT access token in `Authorization` header in order to perform `POST`, `PUT` and `DELETE` operation.
  ```
  Authorization: Bearer jwt_access_token
  ```
* You should authenticate first using `/login` api to get the JWT access token. Any username and password will be authenticated successfully for demo purpose.

## Common-Library
* Common library has been created for re-usability purpose.
* It provides configuration for API logging, security and documentation.
* It provides exception handler for API
* Common library is used by both `product-service` and `review-service`

## Dockerize your microservices
It is essential in microservice environment to containerize the build using Docker.

### Docker Installation
Docker can be installed on Mac using Brew:-
```
brew install --cask docker
```
You should be able to use Docker CLI commands such as `docker` and `docker-compose` after installation.

### Dockerfile
Added `Dockerfile` in each microservice to provide configuration to build and run docker image.

1. To build a docker image for `product-service`, Goto the project's root location, where you have `Dockerfile` and run following command:-
    ```
    $springboot-microservices/product-service > build -t product-service .
    ```

2. To run `product-service` application from docker image, run following command:-
    ```
    $any_path > docker run -d -p 8081:8081 -e "SPRING_PROFILES_ACTIVE=dev" product-service:latest
    ```

`docker` commands are used when you have to build a docker image and run that docker image for an individual microservice. You should use `docker-compose` commands if you want to build and run docker images for multiple microservices at once.

### docker-compose.yaml
Docker compose configuration file `docker-compose.yaml` is at the root folder of repo directory i.e. `springboot-microservices/docker-compose.yaml` which provides all the configuration required to build and run docker image of `product-service` and `review-service`

Goto the repo root directory `springboot-microservices` and execute following command to build and run docker images for both the services at port `8081` and `8082` respectively

```
$springboot-microservices > docker-compose up
```

You can execute following commands to bring all the services down:-

```
$springboot-microservices > docker-compose down
```

### Remote Docker Hub
You can create a [DockerHub](https://www.docker.com/get-started) account to push local docker images to remote docker hub repository
1. To login to remote DockerHub account:-
    ```
    $any_path > docker login
    ```
2. To tag local docker image to remote docker image:-
    ```
    $any_path > docker tag com.example/product-service:latest aklahoti/product-service/0.0.1
    ```
3. To push image to remote docker hub repository:-
    ```
    $any_path > docker image push aklahoti/product-service:0.0.1 
    ```

## CI/CD pipeline proposal
It is essential to automate the continuous integration and continuous deployment (CI/CD) in microservice environment. For this we have:-

1. Added gradle plugins to build and run docker image using gradle tasks
    ```
    plugins {
        id 'com.palantir.docker' version '0.26.0'
        id 'com.palantir.docker-run' version '0.26.0'
    }
    ```
   You should be able to run `:docker` and `:dockerRun` gradle tasks for each microservice after adding the plugins.
2. Added `Jenkinsfile` in each microservice to build Jenkins pipeline such as build, test, build and push docker image using the Gradle tasks.

## Deploy Microservice to Kubernetes (K8S)
### Install K8S
K8S can be installed on Mac using Brew:-
```
brew install kubectl
```
You should be able to use K8S CLI commands `kubectl` after installation.

### deployment.yml
Added `deployment.yml` in each microservice to provide configuration for kubernetes load-balancer service, deployment, pod and container.

To deploy docker image of `product-service` in K8S cluster, Goto the project's root location, where you have `application.yml` and run following command:-
```
$springboot-microservices/product-service > kubectl apply -f deployment.yml
```
This command will create 2 pods for `product-service` in Kubernetes cluster using RollingUpdate strategy. Load balancer service will be accessible at `localhost:9091` which will load balance the traffic to these 2 pods running at port `8081`

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