Created
September 11, 2012 14:22
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Capitrano deployment file for zero downtime deploy with Unicorn and Nginx
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require "bundler/capistrano" | |
set :scm, :git | |
set :repository, "git@repository.com:application.git" | |
set :branch, "develop" | |
set :migrate_target, :current | |
set :ssh_options, { :forward_agent => true } | |
set :rails_env, "production" | |
set :deploy_to, "/home/deployer/apps/application" | |
set :normalize_asset_timestamps, false | |
set :user, "deployer" | |
set :group, "admin" | |
set :use_sudo, false | |
role :web, "HOST_ADDRESS" | |
role :app, "HOST_ADDRESS" | |
role :db, "HOST_ADDRESS", :primary => true | |
set(:latest_release) { fetch(:current_path) } | |
set(:release_path) { fetch(:current_path) } | |
set(:current_release) { fetch(:current_path) } | |
set(:current_revision) { capture("cd #{current_path}; git rev-parse --short HEAD").strip } | |
set(:latest_revision) { capture("cd #{current_path}; git rev-parse --short HEAD").strip } | |
set(:previous_revision) { capture("cd #{current_path}; git rev-parse --short HEAD@{1}").strip } | |
# Use our ruby-1.9.2-p290@application gemset | |
default_environment["RAILS_ENV"] = 'production' | |
default_environment["PATH"] = "/home/deployer/.rvm/gems/ruby-1.9.3-p194/bin:/home/deployer/.rvm/gems/ruby-1.9.3-p194@global/bin:/home/deployer/.rvm/rubies/ruby-1.9.3-p194/bin:/home/deployer/.rvm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" | |
default_environment["GEM_HOME"] = "/home/deployer/.rvm/gems/ruby-1.9.3-p194" | |
default_environment["GEM_PATH"] = "/home/deployer/.rvm/gems/ruby-1.9.3-p194:/home/deployer/.rvm/gems/ruby-1.9.3-p194@global" | |
default_environment["RUBY_VERSION"] = "ruby-1.9.3-p194" | |
default_run_options[:shell] = 'bash' | |
namespace :deploy do | |
desc "Deploy your application" | |
task :default do | |
update | |
restart | |
end | |
desc "Setup your git-based deployment app" | |
task :setup, :except => { :no_release => true } do | |
dirs = [deploy_to, shared_path] | |
dirs += shared_children.map { |d| File.join(shared_path, d) } | |
run "#{try_sudo} mkdir -p #{dirs.join(' ')} && #{try_sudo} chmod g+w #{dirs.join(' ')}" | |
run "git clone #{repository} #{current_path} -b #{branch}" | |
end | |
task :cold do | |
update | |
migrate | |
end | |
task :update do | |
transaction do | |
update_code | |
end | |
end | |
desc "Update the deployed code." | |
task :update_code, :except => { :no_release => true } do | |
run "cd #{current_path}; git fetch origin; git reset --hard origin/#{branch}" | |
finalize_update | |
end | |
desc "Update the database (overwritten to avoid symlink)" | |
task :migrations do | |
transaction do | |
update_code | |
end | |
migrate | |
restart | |
end | |
task :finalize_update, :except => { :no_release => true } do | |
run "chmod -R g+w #{latest_release}" if fetch(:group_writable, true) | |
# mkdir -p is making sure that the directories are there for some SCM's that don't | |
# save empty folders | |
run <<-CMD | |
rm -rf #{latest_release}/log #{latest_release}/public/system #{latest_release}/tmp/pids && | |
mkdir -p #{latest_release}/public && | |
mkdir -p #{latest_release}/tmp && | |
ln -s #{shared_path}/log #{latest_release}/log && | |
ln -s #{shared_path}/system #{latest_release}/public/system && | |
ln -s #{shared_path}/pids #{latest_release}/tmp/pids && | |
ln -sf #{shared_path}/database.yml #{latest_release}/config/database.yml | |
CMD | |
if fetch(:normalize_asset_timestamps, true) | |
stamp = Time.now.utc.strftime("%Y%m%d%H%M.%S") | |
asset_paths = fetch(:public_children, %w(images stylesheets javascripts)).map { |p| "#{latest_release}/public/#{p}" }.join(" ") | |
run "find #{asset_paths} -exec touch -t #{stamp} {} ';'; true", :env => { "TZ" => "UTC" } | |
end | |
end | |
desc "Zero-downtime restart of Unicorn" | |
task :restart, :except => { :no_release => true } do | |
run "kill -s USR2 `cat /tmp/unicorn.application.pid`" | |
end | |
desc "Start unicorn" | |
task :start, :except => { :no_release => true } do | |
run "cd #{current_path}; bundle exec unicorn_rails -c config/unicorn.rb -D" | |
end | |
desc "Stop unicorn" | |
task :stop, :except => { :no_release => true } do | |
run "kill -s QUIT `cat /tmp/unicorn.application.pid`" | |
end | |
namespace :rollback do | |
desc "Moves the repo back to the previous version of HEAD" | |
task :repo, :except => { :no_release => true } do | |
set :branch, "HEAD@{1}" | |
deploy.default | |
end | |
desc "Rewrite reflog so HEAD@{1} will continue to point to at the next previous release." | |
task :cleanup, :except => { :no_release => true } do | |
run "cd #{current_path}; git reflog delete --rewrite HEAD@{1}; git reflog delete --rewrite HEAD@{1}" | |
end | |
desc "Rolls back to the previously deployed version." | |
task :default do | |
rollback.repo | |
rollback.cleanup | |
end | |
end | |
end | |
def run_rake(cmd) | |
run "cd #{current_path}; #{rake} #{cmd}" | |
end |
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