python + django + scikit-learn + mecab (2) on heroku

Continuing from the last time, a memo for making a python application on heroku This time, I will focus on the errors that were caught in the development.

Reference source: https://gist.github.com/konitter/5370904 http://voluntas.hatenablog.com/entry/20110919/1316426034 http://qiita.com/nakazye/items/48651e39f07da82fe79e

install heroku

The main body of heroku is

$ sudo gem install heroku

You can install it with, but an error occurs immediately ...

Operation not permitted - /usr/bin/…/

It seems that the installation folder does not have permission, it is solved by changing the installation folder

$ sudo gem install -n /usr/local/bin heroku

(Reference source: http://qiita.com/AcaiBowl/items/4bb4708de03e6ee14a4a)

virtualenv

Create a folder for development

$ mkdir heroku-django
$ cd heroku-django

In the created folder, expand virtualenv. It is recommended to develop with virtualenv on heroku! !! (To minimize the required libraries)

$ virtualenv --no-site-packages .
$ source bin/activate

Installation of required packages

$ pip install django
$ env ARCHFLAGS="-arch i386 -arch x86_64" bin/pip install psycopg2
$ pip install gunicorn

django: MVC framework for python
psycopg: A package for using postgreSQL from python, heroku's database is postgre, so this is needed
gunicorn: I'm not sure, but something like Apache + mod_wsgi? ??

Record the installed libraries in requirements.txt in the heroku_django directory

$ pip freeze > requirements.txt

Creating a Procfile

Create a Procfile on heroku_django directory (required to use gunicorn on heroku) I stumbled because it didn't move easily

`Procfile`


web: gunicorn --pythonpath './mysite' mysite.wsgi --log-file -

It's okay with one line. The point is to specify the python path

From here, it is the same as normal djnago development http://eiry.bitbucket.org/ It is summarized in an easy-to-understand manner.

Create a .gitignore file in the heroku_django directory (Because you don't push unnecessary files)

`.gitignore`


bin/
include/
lib/
*.pyc

Deploy

When deploying

$ git push heroku master

Error occurred

`Error while running '$ python mysite/manage.py collectstatic --noinput'.`


 Error that static folder cannot be created on heroku, solved by adding the following 3 lines to setting.py


#### **`setting.py`**
```python

PROJECT_DIR  = os.path.dirname(__file__)
PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
STATIC_ROOT = os.path.join(PROJECT_DIR, 'static')

Command to create a static folder just below the directory folder

Operation check

Before deploying

$ python manage.py runserver

$ foreman start

Let's check if the app works with.

bootstrap Precautions when using bootstrap Error that is displayed well on runserver but cannot read css well on foreman start http://stackoverflow.com/questions/16170030/django-serves-static-files-with-runserver-but-not-with-foreman Is pinpoint.

$ pip install whitenoise

Is necessary.