Capistrano: Dump and clone to local database

capistrano_db_dump_and_clone_to_local.rb

# Directly copied from eycap-0.5.2 (thanks!)
#
# With these tasks you can:
#   - dump your production database and save it in shared_path/db_backups
#   - dump your production into your local database (clone_to_local)
#
# Tested and fixed by fjguzman
Capistrano::Configuration.instance(:must_exist).load do

  namespace :db do
    task :backup_name, :roles => :db, :only => { :primary => true } do
      now = Time.now
      run "mkdir -p #{shared_path}/db_backups"
      backup_time = [now.year,now.month,now.day,now.hour,now.min,now.sec].join('-')
      set :backup_file, "#{shared_path}/db_backups/#{environment_database}-snapshot-#{backup_time}.sql"
    end

    desc "Backup your MySQL or PostgreSQL database to shared_path+/db_backups"
    task dump, :roles => :db, :only => {:primary => true} do
      backup_name
      run("cat #{shared_path}/config/database.yml") { |channel, stream, data| @environment_info = YAML.load(data)[rails_env] }
      dbuser = @environment_info['username']
      dbpass = @environment_info['password']
      environment_database = @environment_info['database']
      dbhost = @environment_info['host']
      if @environment_info['adapter'] == 'mysql'
        #dbhost = environment_dbhost.sub('-master', '') + '-replica' if dbhost != 'localhost' # added for Solo offering, which uses localhost
        run "mysqldump --add-drop-table -u #{dbuser} -h #{dbhost} -p #{environment_database} | bzip2 -c > #{backup_file}.bz2" do |ch, stream, out |
          ch.send_data "#{dbpass}\n" if out=~ /^Enter password:/
        end
      else
        run "pg_dump -W -c -U #{dbuser} -h #{dbhost} #{environment_database} | bzip2 -c > #{backup_file}.bz2" do |ch, stream, out |
          ch.send_data "#{dbpass}\n" if out=~ /^Password:/
        end
      end
    end

    desc "Sync your production database to your local workstation"
    task :clone_to_local, :roles => :db, :only => {:primary => true} do
      backup_name
      dump
      get "#{backup_file}.bz2", "/tmp/#{application}.sql.bz2"
      development_info = YAML.load_file("config/database.yml")['development']
      if development_info['adapter'] == 'mysql'
        run_str = "bzcat /tmp/#{application}.sql.bz2 | mysql -u #{development_info['username']} --password='#{development_info['password']}' -h #{development_info['host']} #{development_info['database']}"
      else
        run_str = "PGPASSWORD=#{development_info['password']} bzcat /tmp/#{application}.sql.bz2 | psql -U #{development_info['username']} -h #{development_info['host']} #{development_info['database']}"
      end
      %x!#{run_str}!
    end

  end
end

To disable the peer authentication see http://blog.deliciousrobots.com/2011/12/13/get-postgres-working-on-ubuntu-or-linux-mint/