Backup task for Postgres

postgres.rake

namespace :postgres do
  
  desc 'Backup postgres database'
  task :backup => :environment do
    db_config = Rails.application.config.database_configuration[Rails.env]
    backup_dir = '/home/deploy/backups'
    outfile  = "#{ backup_dir }/#{ Rails.env }_#{ DateTime.now.strftime("%Y%m%d_%H%M%S.sql.gz") }"
    cmd = "pg_dump -h localhost -U #{ db_config['username'] } #{ db_config['database'] } | gzip -c > #{outfile}"
    
    puts "Making database backup..."
    system cmd
  end

  desc 'Restore postgres from an existing backup'
  task :restore, [:backup] => [:environment] do |t, args|
    db_config = Rails.application.config.database_configuration[Rails.env]
    cmd = "psql -h localhost -U #{ db_config['username'] } #{ db_config['database'] } < #{ args[:backup] }"
    puts cmd
  end
end