[DOCS] Document mounting volumes in Docker (#5892)

* [DOCS] Document mounting volumes in Docker

Releases: main, 13.4

* Update Documentation/Administration/Docker/Production/Volumes/Index.rst

Co-authored-by: Stefan Frömken <[email protected]>

* Changes from review

---------

Co-authored-by: Stefan Frömken <[email protected]>

Author: linawolf

Documentation/Administration/Docker/Production/Index.rst

@@ -23,6 +23,7 @@ strategies.
     Distribution/Index
     Database/Index
     FilePermissions/Index
+    Volumes/Index
     Ports/Index
     ReverseProxy/Index
 

Documentation/Administration/Docker/Production/Volumes/Index.rst

@@ -0,0 +1,76 @@
+:navigation-title: Volumes
+
+..  include:: /Includes.rst.txt
+..  _docker-volumes:
+
+============================================
+Mounting volumes for TYPO3 Docker containers
+============================================
+
+When working with Docker containers, you need to mount volumes. This ensures
+that important data persists across container restarts and deployments on the
+host machine.
+
+You should typically map these paths to volumes on the host server that you
+would not include in an `Incremental deployment
+<https://docs.typo3.org/permalink/t3coreapi:manual-deployment-incremental>`_.
+
+This includes user-managed content such as :path:`public/fileadmin`, and cached
+content like :path:`var`.
+
+..  _docker-volumes-config:
+
+Configure directories to be mountable in the Docker file
+========================================================
+
+Within the :file:`Dockerfile`, you can use the `VOLUME` instruction to create a
+mount point for a specified path.
+
+..  seealso::
+    `VOLUME in the Official Docker Documentation
+    <https://docs.docker.com/reference/dockerfile/#volume>`_
+
+..  tabs::
+
+    ..  group-tab:: Classic mode
+
+        ..  code-block:: bash
+
+            VOLUME /var/www/html/fileadmin
+            VOLUME /var/www/html/typo3conf
+            VOLUME /var/www/html/typo3temp
+
+    ..  group-tab:: Composer mode
+
+        ..  code-block:: bash
+
+            VOLUME /var/www/html/public/fileadmin
+            VOLUME /var/www/html/public/typo3temp
+            VOLUME /var/www/html/var
+
+..  _docker-volumes-mounting:
+
+Mount the defined volumes on the host system
+============================================
+
+The method for mounting Docker volumes depends on how you manage your
+containers.
+
+If you use Docker on the console and Docker Compose is available, you can
+configure volumes to be mounted in the :file:`docker-compose.yml`. See the
+chapter `Create the docker-compose.yml file
+<https://docs.typo3.org/permalink/t3coreapi:docker-compose-create-composefile>`_.
+
+If you are using pure Docker commands, refer to `Start the TYPO3 container with
+mounted writable directories
+<https://docs.typo3.org/permalink/t3coreapi:classic-docker-typo3>`_.
+
+Some hosting providers offer a graphical interface to define volumes.
+
+..  note::
+    If a volume is **not mounted** on the host server, its content will be lost
+    when you stop and restart the container or update it.
+
+    Ensure you have a `secure backup strategy
+    <https://docs.typo3.org/permalink/t3coreapi:administration-backups>`_ for
+    user-created content in mounted volumes.