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docs(admin): clarify SYS_NICE capability is Docker-specific #14905

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skjnldsv merged 1 commit into from
May 19, 2026
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docs(admin): clarify SYS_NICE capability is Docker-specific #14905

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6 changes: 4 additions & 2 deletions admin_manual/installation/server_tuning.rst
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Expand Up @@ -252,8 +252,10 @@ Nextcloud to use Imaginary by editing your ``config.php`` file:

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).
Also, ensure to add the capability ``SYS_NICE`` via ``--cap-add=sys_nice`` or (for Compose)
``cap_add: - SYS_NICE``, as it is required by Imaginary to generate HEIC previews.
Also, if running Imaginary in Docker, ensure to add the Docker container capability ``SYS_NICE``
via ``--cap-add=sys_nice`` (Docker CLI) or ``cap_add: - SYS_NICE`` (Docker Compose), as it is
required by Imaginary to generate HEIC previews. This is not applicable when running Imaginary
outside of Docker.

.. note::

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