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169 lines
6.4 KiB
ReStructuredText
169 lines
6.4 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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Configuration
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*************
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In order to configure pgAdmin to run in server mode, it may be necessary to
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configure the Python code to run in multi-user mode, and then to configure the
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web server to find and execute the code.
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Note that there are multiple configuration files that are read at startup by
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pgAdmin. These are as follows:
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* ``config.py``: This is the main configuration file, and should not be modified.
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It can be used as a reference for configuration settings, that may be overridden
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in one of the following files.
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* ``config_distro.py``: This file is read after ``config.py`` and is intended for
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packagers to change any settings that are required for their pgAdmin distribution.
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This may typically include certain paths and file locations.
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* ``config_local.py``: This file is read after ``config_distro.py`` and is intended
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for end users to change any default or packaging specific settings that they may
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wish to adjust to meet local preferences or standards.
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Python
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------
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From pgAdmin 4 v2 onwards, server mode is the default configuration. If running under
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the desktop runtime, this is overridden automatically. There should typically be no
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need to modify the configuration simply to enable server mode to work, however it may
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be desirable to adjust some of the paths used.
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In order to configure the Python code, follow these steps:
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1. Create a ``config_local.py`` file alongside the existing ``config.py`` file.
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2. Edit ``config_local.py`` and add the following settings. In most cases, the default
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file locations should be appropriate:
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*NOTE: You must ensure the directories specified are writeable by
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the user that the web server processes will be running as, e.g. apache or www-data.*
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.. code-block:: python
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LOG_FILE = '/var/log/pgadmin4/pgadmin4.log'
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SQLITE_PATH = '/var/lib/pgadmin4/pgadmin4.db'
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SESSION_DB_PATH = '/var/lib/pgadmin4/sessions'
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STORAGE_DIR = '/var/lib/pgadmin4/storage'
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4. Run the following command to create the configuration database:
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.. code-block:: bash
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# python setup.py
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5. Change the ownership of the configuration database to the user that the web server
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processes will run as, for example, assuming that the web server runs as user
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www-data in group www-data, and that the SQLite path is ``/var/lib/pgadmin4/pgadmin4.db``:
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.. code-block:: bash
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# chown www-data:www-data /var/lib/pgadmin4/pgadmin4.db
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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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Now open the file ``C:\Program Files\pgAdmin4\web\pgAdmin4.wsgi`` with your favorite editor and add the code
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below which will activate Python virtual environment when Apache server runs.
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.. code-block:: python
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activate_this = 'C:\Program Files\pgAdmin4\venv\Scripts\activate_this.py'
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execfile(activate_this, dict(__file__=activate_this))
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**Note:** The changes made in ``pgAdmin4.wsgi`` file will revert when pgAdmin4 is either upgraded or downgraded.
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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 python-home=/path/to/python/virtualenv
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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. |