Migration from heroku to Render failed

1

Hello!
I’m trying to migrate a Django project hosted on Heroku using Blueprint.
I’m following these steps:

When I try deploying I get this error:

image
image1212×358 13.8 KB

/render/build-scripts/apply-buildpacks.py: No such file or directory

How could I fix it?

2

Hey Lucas,

Seems like we had a problem replying on your original post, hopefully this one works. On your original post I responded with:

I suspect you may have an error higher up in the deploy output that may indicate what the cause is

John B

3

Yes! Thank you for your feedback!
Higher up in the output is returned this error:

image
image733×176 5.3 KB

But I specified in the render-buildpacks.json:

{
  "buildpacks": [
    "heroku/python"
  ]
}

Then, also, appears some issues:

Nov 11 07:41:07 AM  #9 0.122 Could not find a 'project.clj' file! Please ensure it exists and is checked into Git.
Nov 11 07:41:07 AM  #9 0.125 Python
Nov 11 07:41:07 AM  #9 0.126 fatal: not a git repository (or any of the parent directories): .git
Nov 11 07:41:07 AM  #9 0.150 -----> No Python version was specified. Using the buildpack default: python-3.10.5
Nov 11 07:41:07 AM  #9 0.150        To use a different version, see: https://devcenter.heroku.com/articles/python-runtimes

Regarding unespecified Python, I set an environment variable setting Python to 3.7, but the message continues.

Thanks already for the feedback. If you could help me debug I’d much appreciate.

4

Hi Lucas–I handle CLI and heroku-import stuff here at Render.

I can’t reproduce your problem, but it’s sounding like some sort of super weird versioning error. It’s trying to run nodejs and Clojure (?) buildpacks for you, but your .render-buildpacks.json file doesn’t have them in it.

Could you verify a couple things for me:

  • It’s .render-buildpacks.json, not render-buildpacks.json as you literalized it in your last message?
  • If so, can you verify that the import ran with the latest version of the Heroku importer? Does it work then?
  • If it works then, what happens when you do docker build -f Dockerfile.render . on your local?
  • And if that doesn’t work, could you email your Dockerfile.render and your .render-buildpacks.json as attachments to ed@render.com?

Thanks!

5

Hello @eropple ! Thanks for your input!
Regarding your questions:

  • The name is .render-buildpacks.json as you said it. Sorry for the confusion.
  • I’m running @renderinc/heroku-import 4.0.0. It’s the latest according to this.
  • After executing the docker build -f Dockerfile.render ., I got following error message:
 => ERROR [builder 3/3] RUN /render/build-scripts/apply-buildpacks.py heroku-22                                                                              0.6s 
------
 > [builder 3/3] RUN /render/build-scripts/apply-buildpacks.py heroku-22:
#9 0.545 Traceback (most recent call last):
#9 0.545   File "/render/build-scripts/apply-buildpacks.py", line 159, in <module>
#9 0.545     raise Exception(err_msg)
#9 0.545 Exception: bin/detect failed for '/render-build/cache/cache/heroku/python'.
#9 0.546  - heroku/python
#9 0.546     - preinstalled buildpack detected
#9 0.546  - 1 buildpacks resolved.
#9 0.546     - /render-build/cache/cache/heroku/python
------
executor failed running [/bin/bash -c /render/build-scripts/apply-buildpacks.py ${HEROKU_STACK}]: exit code: 1

Thank you so much for all the help!

6

Hey Lucas–

Thanks for sending those over. I’ll look at them ASAP, but that you’re getting this error suggests to me that you’re getting a works-as-intended result because /bin/detect can’t find a requirements.txt file. Django uses pyproject.toml these days, I know, but the Heroku buildpack doesn’t seem to understand how to parse that. (I am not a Python user, so this is me mostly going through and trying to reverse engineer things.)

I did find this script that demonstrates how to convert pyproject.toml into a requirements.txt file; if it works (run it, then re-run Docker locally), you could add it to your Dockerfile.render before the apply-buildpacks.py line so you don’t have to keep a requirements.txt file in your repo (or you can manually manage it, your call).

Alternatively, you might be better off using a Python native environment, which understands Poetry/pyproject natively. Native Environments | Render · Cloud Hosting for Developers Converting over your render.yaml should only be a couple of lines, and doable if you don’t have non-Python buildpacks in your Heroku stack.

If you go that route, somebody from Support may be able to help you more concretely, so I’ll ping @John_B to review this thread on Monday (he’ll see it before I will).

-Ed

7

Hello guys!
Thanks for all your support! This is a great community!

So I quit trying to do this via Heroku and Blueprint. Instead I tryed the alternative suggested by @eropple. I followed this guide to deploy a django project.

I manage to deploy the project successfully but, when I access the website’s link, I get Server Error (500).

https://prontuarioafr.onrender.com/login/

Can we discuss it in this thread or should I open another one?

Anyway, I don’t know what’s going on. Could use some help?

Regards! You guys have been awesome!

8

Hello guys!

Just one update…

I saw another post in the Render Community with similar problem.

I noticed that the admin page was loaded successfully! So I tried changing the project to DEBUG and it worked! Very happy about it!

I still don’t know what’s the problem with DEBUG flag. In my project, the difference beetween DEBUG and not DEBUG are the following:

DEBUG
STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static'), ]

NOT DEBUG

STATIC_ROOT = os.path.join(BASE_DIR, 'static')
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

If you have any input on why it doesn’t work with NOT DEBUG settings, I would appreciate a reply.

But, by all means, I’m satisfied with the working deployed application, with Render product and its community.

Thank you so much!

9

For those whom may have the same problem (Server Error 500).
I discovered why it happended.
The variable ALLOWED HOST was set like this based on the tutorial mentioned.

ALLOWED_HOSTS = []
RENDER_EXTERNAL_HOSTNAME = os.environ.get('RENDER_EXTERNAL_HOSTNAME')
if RENDER_EXTERNAL_HOSTNAME:
    ALLOWED_HOSTS.append(RENDER_EXTERNAL_HOSTNAME)

So it was getting a allowed host from a environment variable RENDER_EXTERNAL_HOSTNAME that wasn’t setted up.

I just add a variable:

RENDER_EXTERNAL_HOSTNAME = https://prontuarioafr.onrender.com

Hope this helps! I’m tagging the thread as solved.

Regards!

10

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