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flex_extract.git/For_developers/Sphinx/source/Documentation/Overview/app_modes.rst
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Application modes
Arising from the two user groups described in :doc:`../../Ecmwf/access`, flex_extract has four different user application modes:
- Remote (member)
In the Remote mode the user works directly on a ECMWF member-state Linux server, such as ecgate or cca/ccb. The software will be installed in the $HOME directory. The user does not need to install any of the third-party libraries mentioned in :ref:`ref-requirements`, as ECMWF provides everything with environment modules. The module selection will be done automatically by flex_extract.
- Gateway (member)
The Gateway mode can be used if a local member-state gateway server is in place. Then, the job scripts can be submitted to the ECMWF member-state Linux server via the ECMWF web access tool ecaccess. The installation script of flex_extract must be executed on the local gateway server such that the software will be installed in the $HOME directory at the ECMWF server and that some extra setup is done in the flex_extract directory on the local gateway server. For more information about establishing a gateway server, please refer to ECMWF's instructions on gateway server. For the Gateway mode the necessary environment has to be established which is described in :ref:`ref-prep-gateway`.
- Local member
Scripts are installed and executed on a local machine, either in the current flex_extract directory or in a path given to the installation script. Under this scenario, a software environment similar to that at ECMWF is required. Additionally, web API's have to be installed to access ECMWF server. The complete installation process is described in :ref:`ref-local-mode`.
- Local public
Scripts are installed and executed on a local machine, either in the current flex_extract directory or in a path given to the installation script. Under this scenario, a software environment similar to that at ECMWF is required. Additionally, web API's have to be installed to access ECMWF servers. The complete installation process is described in :ref:`ref-local-mode`. In this case, a direct registration at ECMWF is necessary and the user has to accept a specific license agreement for each dataset he/she intends to retrieve.
An overview is sketched in figure :ref:`ref-fig-marsaccess`.
Application modes
.. toctree::
:hidden:
:maxdepth: 2
