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Devops example application

This application serves as an example to show different methodologies for deployment and building in DevOps.

It consists of four services:

  • frontend
  • proxy
  • backend
  • redis

App diagram with request flow

  +--------------+                                      +--------------+
  |              |                                      |              |
  |   Frontend   |                                      |    Redis     |
  |              |                                      |              |
  +----------+---+                                      +----------+---+
       ^     |                                               ^     |
       |     |                                               |     |
       1     2                                               5     6
       |     |                                               |     |
       |     v                                               |     v
  +----+---------+             +-------------+          +----+---------+
  |              +------3----->|             +----4---->|              |
  |    Client    |             |    Proxy    |          |    Backend   |
  |              |<-----8------+             |<---7-----+              |
  +--------------+             +-------------+          +--------------+

App UI

The application displays proxy and backend instances with version and hostname. Also displays which instances handled the current connection by connecting them by an arrow.

App view

How to run the application

To start the application cd into the .deployment folder and either run dip provision or docker-compose up -d.

In case of docker compose the command will need to be run multiple times because of dependencies, dip tool handles it automatically.

Folder and file structure

Application folders

Whole application is kept in frontend, backend and proxy folders. Each consists of service code, makefile for building and running the application, Dockerfile and files used to deploy to Google Cloud environment.

Other folders

  • .build - builds all components using dip. Used by CI.
  • .deployment - deploys whole project using dip. Can be deployed locally or on external server
  • .github - stores workflows for Github Actions
  • ansible - configures Jenkins server and staging and production environments with auto deployment. To be used with terraform folder
  • doc - documentation related files
  • jenkins - container related files to deploy Jenkins locally
  • terraform - code for deploying infrastructure using Hetzner Cloud and Cloudflare
  • test - files for testing infrastructure

Files

  • Jenkinsfile - different Jenkinsfiles used by Jenkins
  • .travis.yml - Travis CI pipeline

Author

Jan Kacik