Heroku can't find gunicorn command

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I'm trying to put a small Flask app on Heroku. When it starts, it gives me the following message, from the logs:

2015-03-11T01:05:26.737788+00:00 heroku[web.1]: State changed from crashed to starting
2015-03-11T01:05:31.409851+00:00 heroku[web.1]: Starting process with command `gunicorn app:app`
2015-03-11T01:05:33.863601+00:00 app[web.1]: bash: gunicorn: command not found
2015-03-11T01:05:34.644419+00:00 heroku[web.1]: Process exited with status 127
2015-03-11T01:05:34.668264+00:00 heroku[web.1]: State changed from starting to crashed

My Procfile is

web: gunicorn application:app

, and application.py is the file I want to run. I looked up this problem and saw that it was sometimes caused by gunicorn not being in requirements.txt, but my requirements.txt has it, with this line:

gunicorn==19.3.0

. I tried running

heroku run pip install gunicorn

and it told me it installed gunicorn-19.3.0 successfully. But when I tried running it on Heroku with

heroku run gunicorn

it against gave me the "bash: gunicorn: command not found" message.

just add this line into your requirements.txt

gunicorn==19.7.1

that's how i fix it

What is Heroku, A Ruby application deployed with the above config var can access it by calling ENV["ENCRYPTION_KEY"] . All dynos in an application will have� Heroku is known for running apps in dynos – which are really just virtual computers that can be powered up or down based on how big your application is. Think of dynos as malleable building blocks for running your app.

I ran into this same issue. After doing some research, I found this tutorial where they explain that any "local" changes (like importing/using a new module) must be "installed" in the heroku app using pipenv. So in this case what I did was:

$ pipenv install gunicorn

This will "install" gunicorn in you app and add an entry into your (or create a new) Pipfile, which is how Heroku keeps track of the dependencies it needs to install for your app (I believe the use of requirements.txt is still supported, but not what they recommend).

Then, in order to 'activate' the pip environment that has gunicorn installed you must run:

$ pipenv shell

NOTE: You can test whether it worked or not by running $ heroku local

$ heroku local
[WARN] No ENV file found
23:10:25 web.1   |  /bin/sh: gunicorn: command not found
23:10:25 web.1   Exited with exit code 127

With pip environment activated:

$ pipenv shell
Spawning environment shell (/bin/bash). Use 'exit' to leave.
. /Users/carlos/.local/share/virtualenvs/app-jKOcg6b1/bin/activate
bash-3.2$ . /Users/carlos/.local/share/virtualenvs/app-jKOcg6b1/bin/activate
(app-jKOcg6b1) bash-3.2$ heroku local
[WARN] No ENV file found
06:31:12 web.1   |  [2018-06-05 06:31:12 -0600] [28531] [INFO] Starting gunicorn 19.8.1
06:31:13 web.1   |  [2018-06-05 06:31:12 -0600] [28531] [INFO] Listening at: http://0.0.0.0:5000 (28531)
06:31:13 web.1   |  [2018-06-05 06:31:12 -0600] [28531] [INFO] Using worker: sync
06:31:13 web.1   |  [2018-06-05 06:31:12 -0600] [28535] [INFO] Booting worker with pid: 28535

How Heroku Works, You can deploy your free app as many times as you need to, (we love continuous deployment practices), and as long as you have dyno hours, your app will be live � Build scalable apps on a cloud-native platform made for developers. With the Heroku platform, you can program in your favorite language, easily add data services, choose from a marketplace of app elements, and more.

Add gunicorn to requirements.txt.

In pursuit of 12-factor apps, changes to the filesystem made with heroku run are ephemeral.

Build Apps for Free on Heroku, Heroku is meticulously designed to help developers be as productive as possible . The platform removes frustrating obstacles and mundane tasks, so you can stay � Heroku is a cloud-based, fully-managed platform as a service (PaaS) for building, running, and managing apps. The platform is flexible and designed with DX support for you and your team’s preferred development style and to help you stay focused and productive.

I had this problem running Ubuntu 18.04.2 LTS bionic. The solution was to update my PATH variable!

In ~/.profile I added the lines:

if [ -d "$HOME/.local" ] ; then
    PATH="$HOME/.local:$PATH"
fi
if [ -d "$HOME/.local/bin" ] ; then
    PATH="$HOME/.local/bin:$PATH"
fi

I changed the "runtime.txt" to match my version of Python 3. I'm not sure whether that was necessary, but now it is python-3.6.7

Also, because I have various versions of python and pip installed, my commands to install and run locally were:

python3 -m venv getting-started
pip3 install -r requirements.txt
python3 manage.py migrate #I had already created the database
python3 manage.py collectstatic
heroku local

Heroku is for Students, Worker: Worker dynos can be of any process type declared in your Heroku will continue to maintain that dyno formation until you change it. This is a manual install method that can be used in environments where autoupdating is not ideal or where Heroku does not offer a prebuilt Node.js binary. It’s strongly recommended to use one of the other installation methods if possible.

Dynos and the Dyno Manager, Your app can scale to any specified number of dynos based on its resource demands. Heroku's container management capabilities provide you with an easy � If you really do need to trigger a new deployment you can add a new empty commit, then push to Heroku again: git commit --allow-empty -m "Trigger Heroku deploy after enabling collectstatic" git push heroku master The new empty commit is a regular commit. It has a hash, an author, a timestamp, etc. It will have the same tree as its parent.

Heroku Dynos, $25. Choose for lightweight apps and APIs that can boot with 512MB RAM. Add to estimate. Standard 2X.

Pricing, Getting Started on Heroku with Node.js. Introduction. This tutorial will have you deploying a Node.js app to Heroku in minutes. Hang on for a few more minutes to �