How do I run a python script that is in my main directory with Heroku scheduler?
Normally I run this through the command line with Heroku run python "script.py", but this syntax is clearly not correct for the Heroku Scheduler. Where it says "rake do_something" what should the correct syntax be to run a python script here? I've tried "python script.py" and this does not work either.
Thanks!
The Heroku Scheduler will try to run any command you give it. For Python, if you added a mytask.py to
your app repo, you could have the Scheduler run:
python mytask.py
Instead of waiting for the Scheduler to run to see if the command works as expected, you can also test run it like this:
heroku run python mytask.py # or heroku run:detached ...
heroku logs --tail
Another way to use the Scheduler would be to extend your app with a cli tool or a script runner that shares the app context. A popular one for Flask is Flask-Script.
Note: the "rake" references in the Heroku Scheduler docs example is for running tasks with ruby.
Related
I've deployed a python script on heroku and I can run that in local terminal by
heroku run python script.py
command, But when I close the local terminal the script has been stopped.
Is there a way to run deployed script through the heroku server and independent of local machine ?
You can check:
https://devcenter.heroku.com/articles/heroku-cli-commands#heroku-run-detached
heroku run:detached -t python script.py should do the trick for you
Reddy Abel Tintaya Conde's answer using heroku run:detached is good for ad hoc stuff.
But if your script should run continuously, automatically restarting when it fails, you should define a process for it in your Procfile. Such processes are often called worker processes:
worker: python script.py
Then you can scale your worker process up (or down) with heroku ps:scale:
heroku ps:scale worker=1
Whether you run your script this way or via heroku run:detached, remember that this consumes free dyno hours or, if you are using paid dynos, incurs costs.
I am looking to run commands I typically would run through Heroku CLI via a python script, namely:
heroku pg:backups:capture
Historically, for running Heroku commands in Python I have used Heroku3.py, which works for me for things like restarting dynos. I am having difficulty finding a way to execute commands for addons, such as the one listed above.
Is there a way to call CLI commands through python?
How to schedule and run a specific command in django using Windows Task Scheduler. My django project is not currently local server deployed but using the manual set up just like activating the virtual environment and then typing the python manage.py runserver on terminal rather deploying through xampp or laragon. But i am bit confused on how to achieve to schedule and run a command like python manage py get_source through the use of Windows Task Scheduler.
Don't know if you're still looking for this but I found a working solution here - configure .bat file to run commands in Django Virtual Env
Very simple; point to the location of your project directory...
cd C:\webapps\my-project-dir-with-manage.py-inside
copy and paste the contents of the system generated activate.bat,found inside your venv/Scripts folder...
add your command line...
.\manage.py <your command here>
save as myfile.bat, and schedule via the Windows Task Scheduler.
Super simple.
I had the same problem.
The main issue is, that you missed the full path to python.exe as an execution application. "Python" will not work.
And then your application as an argument.
Additionally, to that, you can add w to py. This will make it runnable on windows without a .bat file.
Application to execute:
C:\user\python.exe Argument: manage.pyw runserver
I am looking for help deploying my flash app. I've already written the app and it works well. I'm currently using the following command in the directory of my flask code:
sudo uwsgi --socket 0.0.0.0:70 --protocol=http -w AppName:app --buffer-size=32768
This is on my Amazon Lightsail instance. I have the instance linked to a static public IP, and if I navigate to the website, it works great. However, to get the command to continuously run in the background even after logging out of the Lightsail, I first start a screen command, execute the above line of code, and then detach the screen using ctrl-a-d.
The problem is, if the app crashes (which is understandable since it is very large and under development), or if the command is left running for too long, the process is killed, and it is no longer being served.
I am looking for a better method of deploying a flask app on Amazon Lightsail so that it will redeploy the app in the event of a crash without any interaction from myself.
Generally you would write your own unit file for systemd to keep your application running, auto restart when it crashes and start when you boot your instances.
There are many tutorials out there showing how to write such a unit file. Some examples:
Systemd: Service File Examples
Creating a Linux service with systemd
How to write startup script for Systemd?
You can use pm2
Starting an application with PM2 is straightforward. It will auto
discover the interpreter to run your application depending on the
script extension. This can be configurable via the Ecosystem config
file, as I will show you later on this article.
All you need to install pm2 and then
pm2 start appy.py
Great, this application will now run forever, meaning that if the process exit or throw an exception it will get automatically restarted. If you exit the console and connect again you will still be able to check the application state.
To list application managed by PM2 run:
pm2 ls
You can also check logs
pm2 logs
Keeping Processes Alive at Server Reboot
If you want to keep your application online across unexpected (or expected) server restart, you will want to setup init script to tell your system to boot PM2 and your applications.
It’s really simple with PM2, just run this command (without sudo):
pm2 startup
Pm2 Manage-Python-Processes
For a Django application, I want Heroku Scheduler to perform the following commands:
heroku redis:cli
flushall
exit (ctrl-c)
I do this myself once a day now in terminal, but it would be a lot easier if I can schedule these commands.
My question is, is it possible to put these commands in a Python script, or do I need to work in another way? Does anyone has experience with this?