Rails Deployment using Capistrano

deploy.rb

# Application Settings
set :application,   "your_application_name"
set :user,          "deploy"
set :deploy_to,     "/home/#{user}/apps/#{application}"
set :rails_env,     "test"
set :keep_releases, 5
 
# Git Settings
set :scm,           :git
set :branch,        'development'
set :repo_url,    'git@github.com...'
 
# Deploy Tasks
namespace :deploy do
  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      # Your restart mechanism here, for example:
      execute :touch, release_path.join('tmp/restart.txt')
    end
  end

  after :publishing, :restart
 
  after :restart, :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      # Here we can do anything such as:
      # within release_path do
      #   execute :rake, 'cache:clear'
      # end
    end
  end
  
end
 
before "deploy:setup", "db:configure"
after  "deploy:update_code", "db:symlink"
 
namespace :db do
  desc "Create database yaml in shared path"
  task :configure do
    set :database_username do
      'deploy'
    end
 
    set :database_password do
      Capistrano::CLI.password_prompt "Database Password: "
    end
 
    db_config = <<-EOF
      base: &base
        adapter: postgresql
        encoding: utf8
        reconnect: false
        pool: 5
        username: #{database_username}
        password: #{database_password}
 
      development:
        database: #{application}_development
        <<: *base
 
      test:
        database: #{application}_test
        <<: *base
 
      production:
        database: #{application}_production
        <<: *base
    EOF
 
    run "mkdir -p #{shared_path}/config"
    put db_config, "#{shared_path}/config/database.yml"
  end
 
  desc "Make symlink for database yaml"
  task :symlink do
    run "ln -nfs #{shared_path}/config/database.yml #{latest_release}/config/database.yml"
  end
end