![\"Blackbox](\"http:\/\/p-s.co.nz\/wordpress\/wp-content\/uploads\/2014\/09\/heroku_blackbox.png\")
<\/p>\nI’m now a fan of Heroku. How cool is it to be able to deploy a Python app to free hosting?!<\/p>\n
<\/p>\n
But in spite of great docs at Getting Started with Python on Heroku<\/a> there were a few issues I had to handle. The main problems were because the instructions assumed you wanted to start with their demo app and not your own – which meant that they only explained things like requirements.txt and Procfile after you needed to have already made them (they were already present in the demo version).<\/p>\n Note – I am already familiar with git so I don’t explain that here – see Starting a simple Flask app with Heroku<\/a> for more fleshed-out instructions.<\/p>\n Anyway, here is what I needed to do at the start:<\/p>\n 1) Change the Otherwise the app would fail because of a problem with the port when I ran <\/p>\n 2) I really needed to use virtualenvwrapper and create a requirements.txt file e.g. Otherwise heroku wouldn’t know what dependencies my app needed fulfilled to work successfully.<\/p>\n To update requirements.txt after changes, 3) I needed to make a Procfile:<\/p>\n Note, this was a toy flask app so not using gunicorn etc. Probably should look into that later: <\/p>\n 4) Setting debug mode off probably isn’t essential for deployment but probably a good idea anyway: Some other points: when developing on a different machine, I needed to supply my public key to heroku from that other machine (Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly<\/a>).<\/p>\n And the full sequence for upgrading your app after the prerequisites have been fulfilled is:<\/p>\n heroku addons:add redistogo<\/p>\n To add redis support – NB need to register credit card to use any add-ons, even if free ones.<\/p>\n","protected":false},"excerpt":{"rendered":" I’m now a fan of Heroku. How cool is it to be able to deploy a Python app to free hosting?! But in spite of great docs at Getting Started with Python on Heroku there were a few issues I … Continue reading app.run(host='0.0.0.0')<\/code> line to
\nport = int(os.environ.get(\"PORT\", 33507))
\napp.run(host='0.0.0.0', port=port)<\/code><\/p>\nheroku ps:scale web=1<\/code><\/p>\nStarting process with command `python main.py`
\n...
\nWeb process failed to bind to $PORT within 60 seconds of launch<\/code><\/p>\n
\n
\ncd <folder with code in it>
\nmkvirtualenv blackbox
\n<\/code><\/p>\n
\n
\ncd <folder with code in it>
\nworkon blackbox
\npip freeze > requirements.txt
\ndeactivate blackbox
\n<\/code><\/p>\nweb: python main.py<\/code><\/p>\napp.debug = False<\/code> before deploying.<\/p>\nheroku keys:add ~\/.ssh\/id_rsa.pub<\/code><\/p>\n\n
heroku ps:scale web=1<\/code> again<\/li>\n