Notes on using Heroku

These are a few common things I find myself looking up when working with Heroku - I update this post if I find myself repeated searching for how to do the same tasks.

Running commands from a folder not linked to Heroku

Simply append --app APP_NAME to any relevant Heroku command:

HEROKU_COMMAND --app APP_NAME  

Deployment

If trying to push to Heroku:

 git push heroku master  

but get a publickey error:

 Permission denied (publickey).  
 fatal: The remote end hung up unexpectedly  

You need to add your public key to Heroku.

 heroku keys:add path_to_publickey  

If you don't have a public key, Heroku can prompt and generate one for you - simply use the command:

 heroku keys:add  

Resetting the application database

 heroku pg:reset DATABASE_URL  

To reset the database without a validation prompt, use:

 heroku pg:reset DATABASE_URL --confirm APP_NAME  

Rake

To run a rake task on Heroku, create the task in app/lib/tasks (Rails), test locally then deploy. To run, use:

 heroku run rake TASK_NAME

If you have any useful commands you regularly use while working with Heroku, let me know in the comments below!