sudo a2ensite nextcloud.yourdomain.com.conf sudo systemctl restart apache2

Access the PostgreSQL prompt to create the database infrastructure: sudo -i -u postgres psql Use code with caution.

Wait for the "App enabled" success message. Nextcloud may prompt you to install additional dependencies—accept them. Once complete, you will see a new "Music" (or Harp) icon appear in your Nextcloud top navigation bar.

The initial connection check passes, but the "Test Deploy" action fails, and logs show: Failed heartbeat ... resulted in a 400 Bad Request response .

: If deploying in complex environments like Kubernetes, ensure internal routing is configured so the Nextcloud server can reach the /heartbeat endpoint through the proxy without throwing 404 errors. Docker Compose file to integrate HaRP with your existing Nextcloud setup? AppAPI and External Apps - Nextcloud Documentation