Prelude

Using a docker development environment is strongly suggested, due to the very restrictive methods of installing a Nextcloud instance natively. The only way is installing a web server natively and making the Nextcloud repository readable from within the web server directory, including several owning rights configurations.

Docker

To install docker on your system, please follow the instructions provided by docker itself. You'll need docker-compose, too.

After installing docker, clone the repository and follow the instructions in the README. After running the docker-compose, a nextcloud instance will be launched at http://localhost:8210 with some seeded users. The admin user is admin:admin.

Podman

There are alternatives to run containers in virtual environments on linux, like podman if you prefer a non-root executing tool.

OpenProject Integration in Nextcloud

There is already an integration app for OpenProject available in nextcloud. To enable it, follow the step described here

Hint: This guide only enables the link with a users API key. It is also possible to connect to an OAuth2 provider app configured in OpenProject. The settings to do so are located in nextcloud "Settings > Administration > Connected Accounts".

Comments from Frank

I've got Nextcloud running based on the Docker installation as described in the GitHub page: https://github.com/nextcloud/integration_openproject

The instructions more or less work, but there were a few issues. Please see my quick notes ("OpenProject_Nextcloud_YYYY_MM_DD.odp") attached below for the corrections.

In particular these notes include the fixes to the Nextcloud PHP code to make the Nextcloud -> OP integration work (thank to Wieland!).