An easy solution if you want to publish easily and with a low complexity infraestructure your QGIS maps. QuickWebViewer is a plugin that enables the online publication of maps created in QGIS through a simple three step process:
Step 1: Export mapset, export your qgis files (selecting your predefined themes)
Step 2: Export viewer, pack all your previous exports in a viewer
Step 3: Publish viewer, upload to your own server
The plugin is published on the official QGIS Plugins Repository, documentation can be found at Gitlab.
Client: 300.000 Km/s, UN-Habitat