capistrano code

Upgrade rubygems and/or specific gems themselves via capistrano

When a latest RubyGems is released (e.g. 0.9.5 recently) or Rails (e.g. 2.0.2) you might want to push those upgrades to all your production machines.

Add these two tasks to your deploy.rb capistrano file (add namespaces for cap2.0 if you like)

  desc "Updates RubyGems version"
  task :gem_update_system do
    sudo "gem update --system"
  end

    
  desc "Install a RubyGem from remote source"
  task :gem_install do
    puts "USAGE: GEM=gemname cap gems_install" and next unless ENV['GEM']
    sudo "gem install #{ENV['GEM']} --no-ri --no-rdoc"
  end

To upgrade rubygems and rails, for example:

cap gem_update_system
GEM=rails cap gem_install

to rails capistrano rubygems by nicwilliams on Dec 19, 2007

Dump postgres production data into development database

When bug requests come in, its great to grab a copy of the current production (or system test env) data and sync it into your development database.

Here's a capistrano recipe for postgresql:

desc "Dumps target database into development db"
task :sync_db do
  env   = ENV['RAILS_ENV'] || ENV['DB'] || 'production'
  file  = "#{application}.sql.bz2"
  remote_file = "#{shared}/log/#{file}"
  run "pg_dump --clean --no-owner --no-privileges -U#{db_user} -h#{db_host} #{db_name}_#{env} | bzip2 > #{file}" do |ch, stream, out|
    ch.send_data "#{db_password}\n" if out =~ /^Password:/
    puts out
  end
  puts rsync = "rsync #{user}@#{domain}:#{file} tmp"
  `#{rsync}`
  puts depackage = "bzcat tmp/#{file} | psql #{local_db_dev}"
  `#{depackage}`
end

to rails database backup postgresql postgres capistrano by nicwilliams on May 06, 2007

Capistrano logs

To get the last n lines from a remote log file, use this task

Usage: cap log [-s lines=100] [-s rails_env=production]
So, "cap log" returns 100 lines from production.

desc "Returns last lines of log file. Usage: cap log [-s lines=100] [-s rails_env=production]"
task :log do
  lines     = configuration.variables[:lines] || 100
  rails_env = configuration.variables[:rails_env] || 'production'
  run "tail -n #{lines} #{app_dir}/log/#{rails_env}.log" do |ch, stream, out|
    puts out
  end
end

to rails capistrano by nicwilliams on Apr 10, 2007

Search DZone Snippets

Popular @ dzone.com

Related Tags

nicwilliams's Tags

Never been to DZone Snippets before?

About this user

Upgrade rubygems and/or specific gems themselves via capistrano

Dump postgres production data into development database

Capistrano logs