Project for "Distributed Systems Engineering" course
Grade: 30 with honors / 30
Antonio Scardace @ Dept of Math and Computer Science, University of Catania
The project is a health checker. It aims to check in real-time the health of each observed local utility.
The utility can be a Docker Container, a Machine, or a Network Device in your local network.
If a utility changes its state (i.e. goes offline or comes back online), the monitor notifies the utility referent.
The alert can be a Slack message, an Email, or a Telegram message like these:
An accurate report can be found in /docs/report.pdf
This project was created as an exam project to test a set of skills, including:
- Knowledge of Microservices
- Knowledge of Design Patterns
- Knowledge of Java, Maven, and Spring Boot
- Knowledge of Messaging Systems (RabbitMQ) and their Patterns
- Knowledge of Git & GitHub
I also had the opportunity to practice the following skills:
- Knowledge of ORMs (Hibernate)
- Knowledge of Redis
- Use of the Static Analysis Tools (CodeFactor, Snyk Code, and Sonar Qube)
Each microservice is contained in a Docker Container.
The only reachable containers in the Docker Network are Frontend, API Gateway, and Grafana.
The UML of the internal structure of each microservice is stored in /docs/uml/.
Main Notes:
- RabbitMQ provides an Exchange implementing the Publish-Subscribe Design Pattern.
- The HTTP connection between Monitor and Data Manager is a Keep-Alive (persistent) connection.
- Monitor implements the Factory-Method Design Pattern for the request module.
- Notification implements the Factory-Method Design Pattern for the sender module.
- Both Identity Manager and Monitor microservices use a Redis cache to store, respectively, active tokens and offline utilities. Storing data in a Redis cache rather than a local data structure (e.g. Hash Maps) offers several advantages like scalability, distribution, and persistence.
Here are some useful links for communication:
- Telegram Bot: BotFather
- Slack: Incoming WebHooks
- Email with a 2FA Account: Make an App Custom Password
So that the repository is successfully cloned and the project runs, there are a few prerequisites:
- A stable internet connection.
- A certain amount of RAM and CPU is required.
- Any set of valid credentials or tokens (e.g. for Telegram) to send notifications.
- Need to download and install Docker.
Then, the repo can be cloned, dependencies can be installed, and the project can be run.
$ git clone https://github.com/antonioscardace/NetWatch.git
$ cd YOUR_PATH/NetWatch/
$ bash run.sh| Container | URL | Description |
|---|---|---|
| grafana-charts | https://localhost:8800/ | Grafana Logs |
| rabbitmq | http://localhost:15672/ | RabbitMQ UI |