Heroku is a cloud-based platform that allows you to deploy and manage your applications. It supports multiple programming languages including Ruby on Rails. In this tutorial, you will learn how to deploy a Ruby on Rails application to Heroku.<\/p>\n
Before you begin, make sure you have the following:<\/p>\n
$ cd \/path\/to\/your\/directory\n<\/code><\/pre>\n\n- Create a new Rails application using the following command:<\/li>\n<\/ol>\n
$ rails new myapp\n<\/code><\/pre>\nReplace myapp<\/code> with the desired name for your application.<\/p>\n\n- Change into the application’s directory:<\/li>\n<\/ol>\n
$ cd myapp\n<\/code><\/pre>\nStep 2: Set up Git<\/h2>\n\n- Initialize a new Git repository by running the command:<\/li>\n<\/ol>\n
$ git init\n<\/code><\/pre>\n\n- Add all the files in your application to the repository:<\/li>\n<\/ol>\n
$ git add .\n<\/code><\/pre>\n\n- Commit the changes:<\/li>\n<\/ol>\n
$ git commit -m \"Initial commit\"\n<\/code><\/pre>\nStep 3: Create a Heroku application<\/h2>\n\n- Log in to your Heroku account from the terminal:<\/li>\n<\/ol>\n
$ heroku login\n<\/code><\/pre>\n\n- Create a new Heroku application:<\/li>\n<\/ol>\n
$ heroku create\n<\/code><\/pre>\nThis will create a new Heroku application and add a new remote repository to your Git repository.<\/p>\n
Step 4: Configure your Rails application for Heroku<\/h2>\n\n- Open the
Gemfile<\/code> in your Rails application and add the following line:<\/li>\n<\/ol>\ngem 'pg', '>= 0.18', '< 2.0'\n<\/code><\/pre>\nThis is the PostgreSQL database adapter that Heroku requires.<\/p>\n
\n- Save the
Gemfile<\/code> and run the bundle install<\/code> command:<\/li>\n<\/ol>\n$ bundle install\n<\/code><\/pre>\nStep 5: Set up the database<\/h2>\n\n- By default, Rails uses a SQLite database. However, Heroku requires a PostgreSQL database. You need to update the database configuration to use PostgreSQL.\n
Open the config\/database.yml<\/code> file and update the default<\/code> section as follows:<\/p>\n<\/li>\n<\/ol>\ndefault: &default\n adapter: postgresql\n encoding: unicode\n pool: 5\n username: <%= ENV['DATABASE_USERNAME'] %>\n password: <%= ENV['DATABASE_PASSWORD'] %>\n host: <%= ENV['DATABASE_HOST'] %>\n port: <%= ENV['DATABASE_PORT'] %>\n<\/code><\/pre>\n\n- Run the following command to create the development and test databases:<\/li>\n<\/ol>\n
$ rails db:create\n<\/code><\/pre>\nStep 6: Deploy your application to Heroku<\/h2>\n\n- Deploy your application to Heroku by pushing your code to the remote repository:<\/li>\n<\/ol>\n
$ git push heroku master\n<\/code><\/pre>\nThis command will push your application to the Heroku remote repository and trigger a build and deployment.<\/p>\n
\n- After the deployment is successful, you can open your application in the browser by running the command:<\/li>\n<\/ol>\n
$ heroku open\n<\/code><\/pre>\nStep 7: Set up environment variables<\/h2>\n\n- Some Rails applications require environment variables to be set for configuration. You can set environment variables in Heroku using the
heroku config:set<\/code> command.\nFor example, if your application requires a SECRET_KEY_BASE<\/code> environment variable, you can set it as follows:<\/p>\n<\/li>\n<\/ol>\n$ heroku config:set SECRET_KEY_BASE=your-secret-key\n<\/code><\/pre>\nReplace your-secret-key<\/code> with the actual secret key for your application.<\/p>\nStep 8: Scale your application<\/h2>\n
By default, Heroku assigns a single web dyno to your application. Dynos are isolated, virtualized Linux containers that run your application. You can scale your application to have more dynos using the Heroku dynos<\/code> command.<\/p>\nFor example, to scale your application to have 2 web dynos, run the following command:<\/p>\n
$ heroku ps:scale web=2\n<\/code><\/pre>\nThis will add an additional dyno to your application.<\/p>\n
Step 9: View application logs<\/h2>\n
Heroku provides a logging facility that allows you to view the logs generated by your application. You can view the logs by running the following command:<\/p>\n
$ heroku logs --tail\n<\/code><\/pre>\nThis will show the logs in real-time.<\/p>\n
Step 10: Update your application<\/h2>\n
If you make changes to your application code and want to deploy the updates to Heroku, follow these steps:<\/p>\n