I have a web application where the user can issue the request to execute a program on a different machine. The web application is written in Python. The remote program is C, but on this side language shouldn't matter.
So SSH is the way to go I think (which has been answered here before). But in my use case the remote program can run for days, and obviously I don't want the ssh call to block my web application.
So I could run the remote program as a background process. But I am also interested in knowing when the program finishes and in the exit code.
So is there any way in achieving this?
Related
I'm automating a few things where I work regarding communication using WhatsApp. I have implemented a few scripts using Python (pywhatkit and MySQLdb) that acess my work's database and sends out a few text messages. The thing is, we currently have a local CentOS server up and running and I don't know how to make my script run on that. Like, I was told that the server had no graphical interface, and my script basically opens Firefox and sends texts every once in a while.
How can I make this work from this server? Is there another alternative? This will be used to send a couple of texts every day, so It won't be CPU intensive. Best use scenario would be to run this script every day at a scheduled time, and that's it.
You can use crontab to run script once per day.
Also you can open headless Firefox on CentOS server. Here good explanation how to do it.
I have been facing issue with automation execution of my script on one of the VM. I have automated the functionality of Saving a Document which is ideally a Windows Designed UI. I have tried using various technologies/tools like AutoIT, Python, Sikuli but the script halts if VM is minimized. It works perfectly fine is VM is open via RDP and I can see runtime execution. But If I minimize the RDP, the script halts at 'Save As' dialog box, none of the send keys (Cntrl+s) or (Enter) work via AutoIt script. Please help with some solution so as to have successfully execution of script even in minimized mode.
The reason why your script fails when it gets executed over a minimized RDP session is quite simple. GUI automation/testing tools need to have an unlocked, active desktop - otherwise the operation system thinks that it doesn't need to actually render GUI operations (which is time consuming) since there no user can that can see the rendered graphical user interface anyway. And programs don't communicate via GUIs normally ...
This is why QF-Test and other GUI automation/testing tools often have a note in their FAQs describing this kind of problem. For example FAQ 14 in the case of QF-Test, see https://www.qfs.de/qf-test-handbuch/lc/manual-en-faq.html
As described in the FAQ 14 on Windows 10 or Windows Server 2016 and in case of an RDP connection you need to modify the Registry. Go to
HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client
and add a new value
RemoteDesktop_SuppressWhenMinimized as DWORD having the value 2
After restarting you will then be able to minimize the RDP connections. However disconnecing or closing the RDP connection will probably still result in a failure.
You could try running tscon.exe RDP-Tcp#0 /dest:console as admin as mentioned here. This will disconnect your RDP connection but should leave all GUI programs running normally on the VM. I have personally used this with autoit on a VM and it worked OK. Of course you will not be able to monitor your script as it runs so this may or may not work for you.
What is the correct way to have python schedule (by daniel bader) persistently run. I currently run the job by having a terminal open, connected to a VM where the scripts actually run. There I run python "scheduler.py" - where scheduler.py has all the jobs.
But when the connection closes, or I close the terminal, the scheduler stops.
Any easy solutions to fix this?
You have a couple options here. You are starting the process in your ssh session, but then killing the ssh session, which then kills the process.
One way to handle this, would be to have the VM run the script on startup. You could set the script as a service, so even if it goes down for some reason it will come back up. Read into init.rc for info on how launch a script at boot on linux. I'm not well-versed in Windows any more but I believe there is a way to do the same.
Another option is to keep the session open by connecting to it with screen or tmux. This article explains the problem some and gives you a few different ways to work around the issue: https://www.tecmint.com/keep-remote-ssh-sessions-running-after-disconnection/
My friends and I have written a simple telegram bot in python. The script is run on a remote shared host. The problem is that for some reason the script stops from time to time, and we want to have some sort of a mechanism to check whether it is running or not and restart it if necessary.
However, we don't have access to ssh, we can't run bash scripts and I couldn't find a way to install supervisord. Is there a way to achieve the same result by using a different method?
P.S. I would appreciate it if you gave detailed a explanation as I'm a newbie hobbyist. However, I have no problem with researching and learning new things.
You can have a small supervisor Python script whose only purpose is to start (and restart) your main application Python script. When your application crashes the supervisor takes care and restarts it.
I am writing a Python script that creates and runs several VMs via virsh for the user. Some of the configuration has to be done by executing commands inside the VM which I would want to do automatically.
What would be the easiest way to get remote shell access in Python? I am considering the following approaches:
To use the virsh console command as a sub-process and do I/O to it.
To bring up an SSH session to the VM. I can configure the VM before it boots by editing its file system so I know its target IP address.
Any better API for doing this. RPC?
I need to get the return values for commands so I know if they executed correctly or not. For that matter I need to be able to detect when a program I invoke has finished. Options #1 and #2 rely on scraping the output and that gets complex.
Any suggestions much appreciated.