i’m python beginner and i want to make python tools for below requirement OR wanted to complete below task with Django website.
Task: I have 1 application on server and want to deploy that application to all ~400 machines(mac os client machines ) now i wanted to know is it possible to automate this task by making some GUI Application(using python) OR python website(Django)?
If yes then how to handle offline machines and how to post IP of each machines in one file and from there how to how to distinguish offline machine .What could be prototype?
Related
I am looking to build a webapp for stock management, since it does not need to be hosted on the internet( only admin and sellers can access it ), with it's database on the local computer, I need to find a way for making it easier for the sellers to use the webapp without running a server and all that stuff since they are not tech-savvy
A server is not mainly a computer on the internet or cloud. You can use a local computer as a server. This tutorial is a great way to gather all of the Django application's parts into a single docker-compose file. You can run this docker-compose on any computer, and every computer inside your local network would have access to it (obviously, you should put the computer running the docker-compose in your local network first). Make sure the server's firewall (The computer running the docker-compose) allows traffic on the application's port.
so there is a set of applications that position itself as a distributed cluster O/S called DCOS.
It has an MPI and spark running on top of it.
I am a developer and I have a set of distributed services running connected via socket or ZeroMQ communication system.
How can I port my existing services to DCOS?
Meaning use it's communication facilities instead of sockets/zmq.
Is there any API \ Docs on how not to run it but develop for it?
There are a number of ways to get your application to run on DCOS (and/or Mesos).
First for legacy applications you can use the marathon framework which you can view as kind of the init system of DCOS/Mesos.
If you need more elaborate applications and want to really program against the apis you would write a mesos framework: see the framework development guide for more details.
For deeper integration of your framework into DCOS as for example using the package repository/ command line install option check out/contact mesosphere for more details.
Hope this helps!
Joerg
What I'm trying to design is a system where-by a user can upload a compiled .hex file to a web site, and then that web server sends it on to another server which has a microprocessor connected to it via USB. The web server would then trigger a script to run on that sever which would load the .hex file to the micro.
So my question is: Is it possible for a web server to trigger a shell script or C/Java program on another (trusted) machine?
Yes it's possible. Webservers often support invocation of scripts, usually with the CGI interface. This scripts can perform the required interaction with the other server. How this has to be implemented depends on the webserver and its configuration.
If there is a microcontroller is involved and how this is connected to the second server is not related to this question. Therefore I suggest to remove the microcontroller tag. It's also doubful if it's somehow related to shell at all.
I have created a c++ command line application. This application sends a revives messages from other computers and logs the results to a file. A simple application. One of the first things the app does is write to the log file the start up time.
Now that I have gotten the application to a good place, I want to install it as a service that runs on my computer (win 7).
I am using the NSIS, Simple_Service_Plugin to install the application and register the service in windows. I can see the service in windows service manager.
When I attempt to start the service, I get the following error message. The log file does not get created.
Windows could not start __THE_APP__ service on Local Computer.
Error 1053: The service did not respond to the start or control request in a timely fashion.
When I start the app from explore it starts without any problems and the log file is updated correctly.
When I search this error message on-line I find lots of help for C# and .Net applications and nothing for c++ apps.
My question is:
How do I start a C++ application (not dot.net) as a service?
A service isn't a regular appliction. It's a program that uses specific system classes and implements certain features that enable the OS to communicate with it.
See here (and the surrounding pages) for more details.
Evolution of this question
This started as an attempt to find other recommendations for running Django on Linux, accessing SQL Server via Django-PyODBC, and supporting Unicode as competently as in installations running Django on Windows.
After failing to materialize with a good solution for ODBC drivers in Linux that would provide the same level of support for Unicode as the Windows ODBC driver; the question morphed into coping with the negative side-effect of not having an Apache daemon mode in Windows.
The question
If you run Apache+mod_wsgi on Windows, every time you deploy new Django code you are required to restart the Apache server. See Graham's answer for details on why.
How to run a dependable set of applications and services when you might be required to restart Apache, denying service until it completely restarts?
The issue
We use SQL Server 2005 and we need to support unicode characters and certain characters (like smart-quotes) generated in Microsoft Office applications.
Running Django atop SQL Server 2005 requires us to use Django-PyODBC. It works great on Windows/Linux/Mac OS X; but if you require unicode support, you are out of luck on Linux / Mac OS X - the ODBC drivers for SQL Server in Unix are in varied stage of unicode compliance. FreeTDS, the open source driver, works for some characters if you specify a client character encoding of UTF-8 (*); but doesn't support all characters.
In our tests, running Django on Windows 2003 and using the Microsoft ODBC driver allowed us to properly insert/update/select any character in several different languages, and the Microsoft smart characters from Office applications.
But running on Windows means that every time we deploy new code we are required to bounce Apache - which means a few seconds without service.
(*) The only way we managed to get to the point where some characters would be accepted with FreeTDS, frankly, was to add a client charset entry to freetds.conf:
[a_db_server]
host = a_db_server
port = 1433
tds version = 8.0
client charset = UTF-8
In relation to reloading on Windows when using Apache/mod_wsgi, read my response to:
Server software choice for Django live/staging
Might be bad form to accept one's own answer, but it suited our case and it may help others...
First and foremost: we gave up trying to find an ODBC driver that would work properly with PyODBC and support unicode as competently as the Microsoft native ODBC driver. FreeTDS works partially, and some of the commercial drivers out there just didn't cut it in our tests. We considered a ODBC-JDBC bridge, but never really tested it.
We also thought about using an ODBC router, but given the price for a multi-user solution, the potential for more complexity, and the low load scenario for our Django apps; we decided to just stick with running Django on Windows and try to cope with the requirement of restarting the Apache server every time a new version of any of the Django apps is deployed.
What we did to cope with the Apache restart and still provide service availability:
We deployed an Apache server as a proxy/load-balancer to a cluster of (at the moment) two Apache servers running on Windows
On each of the Windows Apache servers in the cluster we have all our Django apps running
When new code must be deployed to the servers we:
Disable one of the servers in the cluster via Apache's balancer-manager interface
Apply the updates and install any new Django apps in the disabled server
Test the modifications in the disabled server
Reenable the the server in the cluster via Apache's balancer-manager interface
Perform the same steps for the second server
As long as one of the servers in the cluster is enabled and running, the applications and services are available to our users - no interruption. At the same time we gained some load-balancing (in our case we really don't need it at this point).
The proxy Apache servers rewrites all the redirects and cookie response headers, so as long as people are accessing the services through the proxy, there are no modifications needed in the Django code whatsoever.