Installation & Deployment

MDsrv is working under Linux, Mac OS and Windows systems. Here, we explain how to deploy it (Debian-based Linux system as template system). Deployment support for other Linux systems as Arch Linux, Ret Hat, slackware linux, as well as for Windows are currently under development and testing. Current information can be found here.

1. Install the MDsrv

The latest stable release of MDsrv can be easily installed via PyPI or conda.

pip install mdsrv

conda config --add channels conda-forge
conda install mdsrv

To install the development version, download it from the MDsrv GitHub page and install it manually (via executing within the repository).
Pip needs to be installed in advance to add underlying tools otherwise an installation error (e.g. "import setuptools not found") might rise.
For further information, consult the setuptools documentation.

Dependencies: As MDsrv depends on MDTraj, some packages need to be installed in advance to garantee, that MDTraj is working.

mdtraj:cython, numpy, scipy
mdsrv: setuptools, flask

Deployment even on your local machine - why?

With step 1, you can already use the MDsrv locally within your network. In order to add the MDsrv into your daily research, deploy and configure it to your system and your settings. The advantage is that you can add project folders permanently, including their security settings. By setting up an apache server (locally on your machine or global on a web server), you are able to share your sessions and files with colleagues within the same network, collaborators or reviewers. Additionally, you can add a link to your cluster and inspect your unprocessed simulations remotely.

2. Install Apache2 and WSGI

To serve MDsrv as an Apache Webserver via mod_wsgi, install apache2 and libapache2-mod-wsgi to your system.

sudo apt-get install apache2 libapache2-mod-wsgi

3. Add MDsrv-wsgi settings to apache.config

Add the content of apache.config into /etc/apache2/sites-available/000-default.conf or replace this file.

apache configuration file

Important: Adjust the user and group according to your environment settings (e.g. local installation on a pc (nickname@pc) with user=nickname and group=nickname) so that the wsgi process can run with the specified user & group. Make also sure that the files and directories you want to serve are accessible with that user & group combination. Please also adjust the python-path, e.g. to your environment or conda directory or remove this variable to keep the default. For further information on apache.config, please consult the documentation.

4. Add html for MDsrv gui

Copy mdsrv.html into the folder /var/www/html/.

5. Add & adjust the MDsrv configuration file

Download the configuration file app.cfg and save it within a secure directory (e.g. not within /var/www/hmtl/). Here, you can change the host and port, the list of directories where you store your structure and trajectory files (DATA_DIRS) and the security settings. The content and setting is explained elsewhere.

6. Place mdsrv.wsgi

Generate a folder mdsrv in /var/www/ and place mdsrv.wsgi into this folder (/var/www/mdsrv/mdsrv.wsgi). Add the path of the configuration file (app.cfg) into the mdsrv.wsgi file including the name of the file (APP_CFG = '/home/nickname/important/app.cfg'). Restart now the apache server.

7. Restart the apache server

Whenever the app.cfg file is changed, the apache server has to be restarted. If content within the directories is changed, a restart is not necessary. To restart execute

sudo /etc/init.d/apache2 restart
sudo service apache2 restart

8. Access & Visualize your simulations

The MDsrv with the structures and trajectories within the defined folder can be reached at http://localhost/mdsrv.html by loading a structure via "File -> Import" and adding afterwards the trajectory within the structure menu by selecting "Remote trajectory - import". Find out more about the NGL gui at viewing or load trajectories chapter.


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