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6 changes: 6 additions & 0 deletions admin_manual/installation/server_tuning.rst
Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,9 @@ Previews
It is possible to speed up preview generation using an
external microservice: `Imaginary <https://github.com/h2non/imaginary>`_.

We strongly recommend running our custom docker image that is more up to date than the official image.
You can find the image at `docker.io/nextcloud/aio-imaginary:latest` for x64-architecture. For arm64-architecture, there is the `docker.io/nextcloud/aio-imaginary:latest-arm64` image.

To do so, you will need to deploy the service and make sure that it is
not accessible from outside of your servers. Then you can configure
Nextcloud to use Imaginary by editing your `config.php`:
Expand All @@ -147,6 +150,9 @@ Nextcloud to use Imaginary by editing your `config.php`:
],
'preview_imaginary_url' => 'http://<url of imaginary>',

.. warning::

Make sure to start Imaginary with the `-return-size` command line parameter. Otherwise, there will be a minor performance impact. The flag requires a recent version of Imaginary (newer than v1.2.4) and is by default added to the `aio-imaginary` container.

.. note::

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