A hands-on guide to systemd Unit management and multi-version (5.6/5.7), multi-instance MySQL deployment: two production daemon configs, archive download, initialization, per-instance config files, and start/stop plus three-service status verification.
A complete MySQL 8.0 operations guide: installing from the official binary package, OS prep, initialization, config file, multiple start/stop methods, plus password set/change and forgot-password reset.
A complete hands-on SonarQube self-hosting guide: JDK 8 and MySQL 5.6 setup, extracting SonarQube with plugins, running as a non-root user, web token configuration, and scanning code with the sonar-scanner client.
A complete hands-on Jenkins self-hosting guide: RPM install of JDK and Jenkins, running as root, offline plugin install, and wiring GitLab SSH keyless access with webhook-triggered CI builds.
A complete hands-on guide to self-hosting GitLab: RPM install, components, common commands, web UI setup, SSH keyless access, and multi-user collaboration.