This has puzzled me for the past few months...I'm admittedly new to server administration and I took a stab running a production rails app over at EC2. While I've learned a lot and feel pretty comfortable using it, I don't know the reason why it takes ~ 1-2 minutes for a request to go through after deploying my code. From all I've gathered through google, it's something with passenger starting back up. The solution seems to be crafting a rolling restart script.
My server setup is:
- Amazon EC2 Ubuntu 12.04 EBS small instance
- Nginx
- Passenger
- PostgreSQL 9.2
- Ruby 1.9.3
- Rails 3.2.11
- Deployment with Capistrano
All pretty basic stuff going on here... hardly any custom configuration in any part of the stack. I first deployed to Amazon using Rubber, but then built a server from scratch because I assumed Rubber was the cause of the slow spin up after a deploy... but it still hangs. Sure, I could do rolling restart, add another instance and load balancer along with a third instance to be a database instance, but for the time being it doesn't make sense for this project.
I have a few nearly identical server setups on other hosts (rails, nginx, passenger, and postgresql on centOS) and they deploy much quicker. They do not have nearly the same lag between the finish of a cap deploy and the first request going through.
adding my cap deploy file
require 'rvm/capistrano'
require 'bundler/capistrano'
require 'sidekiq/capistrano'
set :stages, %w(production staging)
set :default_stage, "staging"
require 'capistrano/ext/multistage'
set :application, "bundio"
set :repository, "git@bitbucket.org:my/project.git"
set :scm, "git"
set :shared_children, shared_children + %w{public/uploads} # include public/uploads in the shared folder to be symlinked across releases
ssh_options[:forward_agent] = true
ssh_options[:keys] = [File.join(ENV["HOME"], ".ec2", "my-keypair")]
set :deploy_to, "/var/www/apps/project"
set :rails_env, "production"
set :rvm_type, :system
set :rvm_path, "/usr/local/rvm"
set :keep_releases, 3
set :deploy_via, :remote_cache
desc "check production task"
task :check_production do
if stage.to_s == "production"
puts " \n Are you REALLY sure you want to deploy to production?"
puts " \n Enter the password to continue\n "
password = STDIN.gets[0..12] rescue nil
if password != 'doubleCheck'
puts "\n !!! WRONG PASSWORD !!!"
exit
end
end
end
#############
### Hooks ###
#############
before "deploy", "check_production"
# if you want to clean up old releases on each deploy uncomment this:
after "deploy:restart", "deploy:cleanup"
after "deploy:update_code", "deploy:symlink_shared"
after "deploy:update_code", "deploy:migrate"
after "deploy", "deploy:restart_daemons"
#################
### End hooks ###
#################
set :bundle_without, [:development,:test]
namespace :deploy do
namespace :assets do
task :precompile, :roles => :web, :except => { :no_release => true } do
begin
from = source.next_revision(current_revision)
rescue
err_no = true
end
if err_no || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile}
else
logger.info "Skipping asset pre-compilation because there were no asset changes"
end
end
end
task :link_db do
#run "ln -s #{shared_path}/config/database.yml #{latest_release}/config/database.yml"
end
task :start do ; end
task :stop do ; end
task :restart, :roles => :app, :except => { :no_release => true } do
run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
end
task :restart_daemons, :roles => :app do
sudo "monit restart all -g daemons"
end
desc "Symlink shared/* files"
task :symlink_shared, :roles => :app do
run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
end
end
