SonarQube Architecture and Integration Overview

SonarQube is composed of four main components: the SonarQube server, the database, the plugin library, and the scanner.

The server is frequently used by developers and administrators to browse code quality and configure the system; it integrates ElasticSearch for search services and includes a compute engine that processes analysis reports and stores them in the database.

The database stores code analysis data reports and supports Oracle, PostgreSQL, and MySQL.

The plugin library enhances platform functionality, with common plugin categories such as SCM, integration, authentication, and maintenance.

The scanner is a client tool that scans projects and uploads the scan results to the server.

The typical development workflow starts with developers installing SonarLint in their IDE for local code analysis, then committing code to version control systems like GitLab or SVN. A continuous integration server triggers the Sonar scanner to analyze the committed code, after which the scanner pushes the results to the SonarQube server. The server stores the analysis results in the database and displays them through the UI.

During code review, developers use the UI to examine code issues and reduce technical debt, managers obtain analysis reports, and operations teams retrieve SonarQube data via APIs and monitor the server using JMX.

Deployment considerations include: each component should be installed on a dedicated machine for optimal performance; multiple SonarQube servers cannot share a single database; scanners can be scaled across multiple machines; all machines must have synchronized time; the server and database must reside on the same network; scanners and servers may be on different networks; scanners do not communicate directly with the database.