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Jackson, Mike, 07 March 2012 12:36


Deploying the MAUS web-front end

This page describes how to install and run the MAUS web front-end.

  • The web front-end can either be run in the Django lightweight web server or under Apache 2.0. The latter is recommended for production environments.
  • The MAUS software is not required to use the MAUS web front-end. However, if you do not have MAUS then you will need to install Python 2.7 and related packages.

Install Python 2.7 and related packages

If you have downloaded and built the MAUS software (which comes with Python 2.7 and Python setuptools) then go down to Install ImageMagick.

To install Python (2.7.2) by building it from its source code:

  • Log in as a super-user by using sudo su - or su.
  • Get the Python 2.7 source distribution and unpack it,
    $ wget http://www.python.org/ftp/python/2.7.2/Python-2.7.2.tgz
    $ mv Python-2.7.2.tgz Python-2.7.2.tar.gz
    $ gunzip Python-2.7.2.tar.gz 
    $ tar -xf Python-2.7.2.tar 
    $ cd Python-2.7.2
    
  • Configure,
    $ ./configure
    
  • Build,
    $ make
    
  • Install,
    $ make install
    

For more information, see http://www.python.org/getit/releases/2.7//

Install Python setuptools

Python setuptools (http://pypi.python.org/pypi/setuptools) is a suite of useful Python configuration tools. Foremost amongst these is easy_install which supports straightforward installation of Python packages.

To install Python setuptools (0.6c11) for Python 2.7:

  • Log in as a super-user by using sudo su - or su.
  • Get the setuptools egg,
    $ wget http://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg#md5=fe1f997bc722265116870bc7919059ea
    
  • Execute the egg,
    $ sh setuptools-0.6c11-py2.7.egg 
    

Install ImageMagick

The ImageMagick library (http://www.imagemagick.org/script/index.php) is used to convert between image types.

Check to see if you already have this, as it is a commonly installed tool,

$ /usr/local/bin/convert -h
Version: ImageMagick 6.7.4-0 2011-12-13 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC
Features: OpenMP    

If so then go down to Install Django, MagickWand and Python Image Library packages.

To install ImageMagick (6.7.4),

  • Log in as a super-user by using sudo su - or su.
  • Get and unpack ImageMagick,
    $ wget http://www.imagemagick.org/download/ImageMagick.tar.gz
    $ gunzip ImageMagick.tar.gz
    $ tar -xf ImageMagick.tar
    $ cd ImageMagick-6.7.4-0/
    
  • Configure,
    $ ./configure
    
  • Make,
    $ make
    
  • Install,
    $ make install
    
    • This places libraries in /usr/local/lib.
  • Cache the libraries,
    $ /sbin/ldconfig /usr/local/lib
    
    • This avoids problems with libraries not being found by Python's magickwand library.
  • Check,
    $ /usr/local/bin/convert -h
    Version: ImageMagick 6.7.4-0 2011-12-13 Q16 http://www.imagemagick.org
    Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC
    Features: OpenMP    
    

Install Django, MagickWand and Python Image Library packages

To install the current versions of these Python packages using easy_install:

  • If you have installed Python 2.7 as a super-user (and are not using the version bundled with MAUS) then, log in as a super-user by using sudo su - or su.
  • Run,
    $ easy_install django
    $ easy_install magickwand
    $ easy_install pil
    

Check MagickWand:

  • Start Python,
    $ python
    $ import magickwand
    $ from magickwand.image import Image
    ...
    
  • If you get an error like,
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "build/bdist.linux-i686/egg/magickwand/image.py", line 2, in <module>
      File "build/bdist.linux-i686/egg/magickwand/api/__init__.py", line 1, in <module>
        #
      File "build/bdist.linux-i686/egg/magickwand/api/lib.py", line 11, in <module>
      File "/home/user/maus/third_party/install/lib/python2.7/ctypes/__init__.py", 
      line 353, in __init__ self._handle = _dlopen(self._name, mode)
    OSError: libMagickWand.so.5: cannot open shared object file: 
     No such file or directory
    
  • then, as super-user, run ldconfig:
    $ /sbin/ldconfig /usr/local/lib
    

Install Apache 2.2

Apache 2.2 (http://httpd.apache.org/) is an HTTP server.

If you do not want to use Apache 2 but are happy to use the stand-alone lightweight Django web server then go down to Install the MAUS web front-end.

To install Apache 2.2,

  • Log in as a super-user by using sudo su - or su.
  • Download,
    $ wget http://mirrors.ukfast.co.uk/sites/ftp.apache.org//httpd/httpd-2.2.22.tar.gz
    
  • Extract,
    $ gzip -d httpd-2.2.22.tar.gz 
    $ tar xvf httpd-2.2.22.tar
    $ cd httpd-2.2.22
    
  • Configure,
    $ ./configure
    
    • This uses a default installation directory of /usr/local/apache2.
  • Compile,
    $ make 
    
  • Install,
    $ make install 
    
  • Start-up server,
    $ /usr/local/apache2/bin/apachectl -k start
    
    • If you get an error like,
      (98)Address already in use: make_sock: could not bind to address [::]:80
      (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
      no listening sockets available, shutting down
      Unable to open logs
      
    • Then edit /usr/local/apache2/conf/httpd.conf and change,
      Listen 80 
      
    • to a port that is not in use e.g.
      Listen 9090
      
    • and try to start Apache again as described above.
  • Browse to http://localhost:8080 (or whatever port you specified above) and you should see It works!"

More information:

Install mod_wsgi

mod_wsgi (http://code.google.com/p/modwsgi/) is an Apache module allowing the hosting of Python applications which suppport Python's WSGI (Web Server Gateway Interface).

To install mod_wsgi (July 2010 release) under Apache 2.2,

  • Log in as a super-user by using sudo su - or su.
  • Download release,
    $ wget http://modwsgi.googlecode.com/files/mod_wsgi-3.3.tar.gz
    
  • Extract,
    $ gunzip mod_wsgi-3.3.tar.gz 
    $ tar -xf mod_wsgi-3.3.tar
    $ cd mod_wsgi-3.3
    
  • Set Python library path,
    • If you are not using the MAUS software to provide Python 2.7, then skip this step.
    • If you are using the MAUS software to provide Python 2.7, then set LD_PYTHON_PATH to the location of its libraries e.g.:
      $ export LD_LIBRARY_PATH=/home/user/maus/third_party/install/lib/
      
  • Configure,
    • If you installed Python 2.7 then run,
      $ ./configure --with-apxs=/usr/local/apache2/bin/apxs
      
    • If you are using the MAUS software to provide Python 2.7, you need to provide the path, so run,
      $ ./configure --with-apxs=/usr/local/apache2/bin/apxs
        --with-python=/home/user/maus/third_party/install/bin/python2.7
      
    • If you get an error like:
      /home/user/maus/third_party/install/bin/python2.7: error while loading 
      shared libraries: libpython2.7.so.1.0: cannot open shared object file: 
      No such file or directory
      
    • then set the LD_LIBRARY_PATH as above.
    • If you get an error like:
      checking for apxs2... no
      checking for apxs... no
      checking Apache version... ./configure: line 1704: apxs: command not found
      ./configure: line 1704: apxs: command not found
      ./configure: line 1705: apxs: command not found
      ./configure: line 1708: /: is a directory
      
      checking for python... /home/user/maus/third_party/install/bin/python
      ./configure: line 1877: apxs: command not found
      configure: creating ./config.status
      config.status: error: cannot find input file: Makefile.in
      
    • then you forgot to provide the path to Apache's apxs command,
  • Compile,
    $ make
    
  • Install,
    $ make install
    
  • A mod_wsgi.so library is installed in /usr/local/apache2/modules.
  • Configure Apache:
    • Edit /usr/local/apache2/conf/httpd.conf
    • Look for the comment,
      # Example
      # LoadModule foo_module modules/mod_foo.so
      #
      
    • Under this comment, add,
      LoadModule wsgi_module modules/mod_wsgi.so
      
  • Set the LD_LIBRARY_PATH in the Apache environment,
    • If you are not using the MAUS software to provide Python 2.7, then skip this step.
    • If you are using the MAUS software to provide Python 2.7, then set LD_PYTHON_PATH to the location of its libraries,
      • Edit /usr/local/apache2/bin/envvars and insert your path on a line before the export LD_LIBRARY_PATH line, so the file becomes
        LD_LIBRARY_PATH="/usr/local/apache2/lib:$LD_LIBRARY_PATH" 
        LD_LIBRARY_PATH="/home/user/maus/third_party/install/lib/:$LD_LIBRARY_PATH" 
        export LD_LIBRARY_PATH
        
      • Ensure that the permissions in your path allow group and world read and execute permission (755),
        $ chmod go+rx /home/user
        
  • Restart Apache,
    $ /usr/local/apache2/bin/apachectl restart
    
  • If all is well you should see, in /usr/local/apache2/logs/error_log, a line like,
    [Tue Feb 07 18:50:37 2012] [notice] Apache/2.2.22 (Unix) mod_wsgi/3.3 
    Python/2.7.2 configured -- resuming normal operations
    
  • If you see an error like,
    [Tue Feb 07 18:46:40 2012] [notice] SIGHUP received.  Attempting to restart
    httpd: Syntax error on line 55 of /usr/local/apache2/conf/httpd.conf: Cannot 
    load /usr/local/apache2/modules/mod_wsgi.so into server: 
    libpython2.7.so.1.0: cannot open shared object file: No such file or directory
    
    • then you have to set the LD_LIBRARY_PATH as above.
  • If you see an error like,
    Could not find platform independent libraries <prefix>
    Could not find platform dependent libraries <exec_prefix>
    Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
    ImportError: No module named site
    
    • then it is likely you did not set the file permissions for the directory in which Python is as described above.
  • Clean up,
    $ make clean
    

To check your installation,

  • List server information,
    $ /usr/local/apache2/bin/httpd  -V
    Server version: Apache/2.2.22 (Unix)
    ...
    Server MPM:     Prefork
      threaded:     no
        forked:     yes (variable process count)
    Server compiled with....
     -D APACHE_MPM_DIR="server/mpm/prefork" 
    ...
    
    • Important information is the version and prefork settings,
  • List compiled-in modules,
    $ /usr/local/apache2/bin/httpd  -l
    Compiled in modules:
    ...
      prefork.c
    
    • You should see prefork.c.
  • List dynamically-loaded modules,
    $ /usr/local/apache2/bin/httpd  -M
     mpm_prefork_module (static)
     ...
     wsgi_module (shared)
     ...
    
    • You should see wsgi_module.
    • If this fails with,
      httpd: Syntax error on line 55 of /usr/local/apache2/conf/httpd.conf: 
      Cannot load /usr/local/apache2/modules/mod_wsgi.so into server: 
      libpython2.7.so.1.0: cannot open shared object file: No such file or directory
      
    • Then set your LD_LIBRARY_PATH as above and try again,
      $ export LD_LIBRARY_PATH="/home/user/maus/third_party/install/lib/:$LD_LIBRARY_PATH" 
      $ /usr/local/apache2/bin/httpd -M
      Loaded Modules:
      ...
      
  • List modules linked to by mod_wsgi:
    $ ldd /usr/local/apache2/modules/mod_wsgi.so
    ...
    libpython2.7.so.1.0 => /home/user/maus/third_party/install/lib/libpython2.7.so.1.0 
    (0x00110000)
    ...
    
    • You should see the link to your Python library.

More information:

Install the MAUS web front-end

Check-out the MAUS Django code,

$ bzr branch -v lp:maus-apps
$ cd maus-apps

You can either run the MAUS web front-end under the Django web server or under Apache 2.

Run the web front-end under the Django web server

  • Create the environment script,
    • If you are not using the MAUS software to provide Python 2.7:
      $ ./configure
      
    • If you are using the MAUS software to provide Python 2.7:
      $ ./configure --with-maus
      
  • Set up the environment,
    • If you are using the MAUS software to provide Python 2.7 then set up the MAUS environment as described in the MAUS user guide, e.g.
      $ source /home/user/maus/env.sh
      
    • Set up the MAUS web front-end environment:
      $ source env.sh
      
  • Start the Django web server. Run:
    $ python src/mausweb/manage.py runserver HOST:PORT
    
    • where HOST is your host name and PORT is the port on which the web server listens. For example
      $ python src/mausweb/manage.py runserver localhost:9000
      
    • or,
      $ python src/mausweb/manage.py runserver maus.epcc.ed.ac.uk:9000
      

Run the web front-end under the Apache web server

  • Create the environment script,
    • If you are not using the MAUS software to provide Python 2.7:
      $ ./configure
      
    • If you are using the MAUS software to provide Python 2.7:
      $ ./configure --with-maus
      
  • Log in as a super-user by using sudo su - or su.
  • Set the paths in the Apache environment, edit /usr/local/apache2/bin/envvars:
    • If you are not using the MAUS software to provide Python 2.7, then add, on a line before the export LD_LIBRARY_PATH line, a command to sources the MAUS web front-end env.sh script e.g.:
      source /home/user/maus-apps/env.sh
      
    • If you are using the MAUS software to provide Python 2.7, then add, on lines before the export LD_LIBRARY_PATH line, commands to sources the MAUS software and MAUS web front-end env.sh scripts e.g.:
      source /home/user/maus/env.sh
      source /home/user/maus-apps/env.sh
      
    • Ensure that the permissions in your path allow group and world read and execute permission (755) to these scripts e.g.,
      $ chmod go+rx /home/user
      
  • Edit the Apache 2 configuration, /usr/local/apache2/conf/httpd.conf and add to the end of the file:
    WSGIScriptAlias / ${MAUS_WEB_DIR}/apache/django.wsgi  
    
    <Directory ${MAUS_WEB_DIR}/apache> 
    Order deny,allow  
    Allow from all  
    </Directory> 
    
    • For your information,
      • / specifies the root URL - so all URL requests will be directed to Django.
      • /... - location of WSGI file within the MAUS Django project.
  • Restart Apache 2.2,
    $ /usr/local/apache2/bin/apachectl restart
    
For information on running Django under Apache 2.2/mod_wsgi, see:

Test your installation

  • Copy a couple of sample images,
    $ cp images/* media/raw
    
  • Browse to the URL http://HOST:PORT/maus where HOST is your host name and PORT is the port on which the web server listens. For example http://localhost:80/maus/

Supported images

Currently the MAUS web front-end supports any image formats with extensions supported by Matplotlib or
PyROOT and handled by MagickWand image converter:

  • PostScript: "ps"
  • Enhanced PostScript: "eps"
  • PNG: "png"
  • PDF: "pdf"
  • GIF: "gif"
  • JPEG: "jpg", "jpeg"

Updated by Jackson, Mike over 9 years ago · 28 revisions