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98 lines
3.5 KiB
ReStructuredText
98 lines
3.5 KiB
ReStructuredText
.. _server_deployment:
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*****************
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Server Deployment
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*****************
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pgAdmin may be deployed as a web application by configuring the app to run in
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server mode and then deploying it either behind a webserver running as a reverse
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proxy, or using the WSGI interface.
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The following instructions demonstrate how pgAdmin may be run as a WSGI
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application under ``Apache HTTP``, using ``mod_wsgi``.
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Requirements
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------------
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**Important**: Some components of pgAdmin require the ability to maintain affinity
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between client sessions and a specific database connection (for example, the
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Query Tool in which the user might run a BEGIN command followed by a number of
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DML SQL statements, and then a COMMIT). pgAdmin has been designed with built-in
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connection management to handle this, however it requires that only a single
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Python process is used because it is not easily possible to maintain affinity
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between a client session and one of multiple WSGI worker processes.
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On Windows systems, the Apache HTTP server uses a single process, multi-threaded
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architecture. WSGI applications run in ``embedded`` mode, which means that only
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a single process will be present on this platform in all cases.
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On Unix systems, the Apache HTTP server typically uses a multi-process, single
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threaded architecture (this is dependent on the ``MPM`` that is chosen at
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compile time). If ``embedded`` mode is chosen for the WSGI application, then
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there will be one Python environment for each Apache process, each with it's own
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connection manager which will lead to loss of connection affinity. Therefore
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one should use ``mod_wsgi``'s ``daemon`` mode, configured to use a single
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process. This will launch a single instance of the WSGI application which is
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utilised by all the Apache worker processes.
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Whilst it is true that this is a potential performance bottleneck, in reality
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pgAdmin is not a web application that's ever likely to see heavy traffic
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unlike a busy website, so in practice should not be an issue.
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Future versions of pgAdmin may introduce a shared connection manager process to
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overcome this limitation, however that is a significant amount of work for
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little practical gain.
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Apache HTTPD Configuration (Windows)
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------------------------------------
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Once Apache HTTP has been configured to support ``mod_wsgi``, the pgAdmin
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application may be configured similarly to the example below:
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.. code-block:: apache
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<VirtualHost *>
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ServerName pgadmin.example.com
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WSGIScriptAlias / "C:\Program Files\pgAdmin4\web\pgAdmin4.wsgi"
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<Directory "C:\Program Files\pgAdmin4\web">
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Order deny,allow
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Allow from all
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</Directory>
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</VirtualHost>
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Apache HTTPD Configuration (Linux/Unix)
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---------------------------------------
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Once Apache HTTP has been configured to support ``mod_wsgi``, the pgAdmin
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application may be configured similarly to the example below:
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.. code-block:: apache
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<VirtualHost *>
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ServerName pgadmin.example.com
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WSGIDaemonProcess pgadmin processes=1 threads=25
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WSGIScriptAlias / /opt/pgAdmin4/web/pgAdmin4.wsgi
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<Directory /opt/pgAdmin4/web>
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WSGIProcessGroup pgadmin
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WSGIApplicationGroup %{GLOBAL}
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Order deny,allow
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Allow from all
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</Directory>
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</VirtualHost>
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**Note:** If you're using Apache HTTPD 2.4 or later, replace the lines:
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.. code-block:: apache
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Order deny,allow
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Allow from all
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with:
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.. code-block:: apache
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Require all granted
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Adjust as needed to suit your access control requirements. |