独角兽零宕机不起作用

Question

我正在使用capistrano 3.和独角兽重新启动虽然-USR2信号似乎不会重新加载应用程序。

#config/unicorn.rb 
rails_root = "/home/deployer/apps/my_app/current" 
worker_count = 2 
worker_processes worker_count 

working_directory rails_root 

worker_count.times do |index| 
    listen "#{rails_root}/tmp/sockets/unicorn.sock.#{index}", :backlog => 64 
end 

timeout 30 

pid "#{rails_root}/tmp/pids/unicorn.pid" 

stderr_path rails_root + "/log/unicorn.stderr.log" 
stdout_path rails_root + "/log/unicorn.stdout.log" 

preload_app true 

before_fork do |server, worker| 
    old_pid = "#{rails_root}/tmp/pids/unicorn.pid.oldbin" 
    if File.exists?(old_pid) && server.pid != old_pid 
    begin 
     server.logger.info("sending QUIT to #{old_pid}") 
     Process.kill("QUIT", File.read(old_pid).to_i) 
    rescue Errno::ENOENT, Errno::ESRCH 
     # someone else did our job for us 
    end 
    end 
end 

after_fork do |server, worker| 
end 


#unicorn.cap 
namespace :deploy do 

    desc 'Restart application' 
    task :restart do 
    sleep 3 
    invoke 'unicorn:restart' 
    end 
end 

namespace :unicorn do 
    task :show_vars do 
    on roles :app do 
     puts <<-EOF.gsub(/^ +/, '') 
     unicorn_pid  #{fetch(:unicorn_pid)} 
     deploy_to  #{fetch(:deploy_to)} 
     deploy_path  #{fetch(:deploy_path)} 
     EOF 
    end 
    end 


    def run_unicorn 
    within current_path do 
     execute :unicorn_rails, "-C#{current_path}/config/unicorn.rb -D -E #{fetch(:rails_env)}" 
    end 
    end 

    desc "Start Unicorn" 
    task :start do 
    on roles :app do 
     run_unicorn 
    end 
    end 

    desc 'Stop unicorn' 
    task :stop do #, :except => { :no_release => true } 
    on roles(:app) do 
     if test "[ -f #{fetch(:unicorn_pid)} ]" 
     execute :kill, "-s QUIT `cat #{fetch(:unicorn_pid)}`" 
     end 
    end 
    end 

    desc 'Restart unicorn' 
    task :restart do #, except => { :no_release => true } 
    on roles(:app) do 
     if test "[ -f #{fetch(:unicorn_pid)} ]" 
     execute :kill, "-USR2 `cat #{fetch(:unicorn_pid)}`" 
     else 
     run_unicorn 
     end 
    end 
    end 
end 

当我运行cap production deploy麒麟成功地重新启动，但似乎不会重新加载应用程序。

#before deploy 
root@sandbox:~# ps aux | grep unicorn 
deployer 13418 0.0 1.9 363516 120064 ?  Sl 00:20 0:23 unicorn_rails master -c /home/deployer/apps/my_app/current/config/unicorn.rb -D -E production 
deployer 13426 0.0 2.0 369828 123332 ?  Sl 00:21 0:02 unicorn_rails worker[0] -c /home/deployer/apps/my_app/current/config/unicorn.rb -D -E production 
deployer 13429 0.0 2.0 374580 127884 ?  Sl 00:21 0:03 unicorn_rails worker[1] -c /home/deployer/apps/my_app/current/config/unicorn.rb -D -E production 
root  17250 0.0 0.0 7828 884 pts/1 R+ 11:36 0:00 grep unicorn 

#after deploy 
root@sandbox:~# ps aux | grep unicorn 
deployer 17300 16.2 1.9 298320 120288 ?  Sl 11:37 0:22 unicorn_rails master -c /home/deployer/apps/my_app/current/config/unicorn.rb -D -E production 
deployer 17319 1.3 2.0 305496 124100 ?  Sl 11:37 0:01 unicorn_rails worker[0] -c /home/deployer/apps/my_app/current/config/unicorn.rb -D -E production 
deployer 17322 1.2 2.0 309064 127620 ?  Sl 11:37 0:01 unicorn_rails worker[1] -c /home/deployer/apps/my_app/current/config/unicorn.rb -D -E production 
root  17330 0.0 0.0 7828 880 pts/1 R+ 11:39 0:00 grep unicorn 

Restarting Unicorn with USR2 doesn't seem to reload production.rb settings - 不要为我

Answer 1

解决问题，通过以下更改工作：

# config/unicorn.rb 
Unicorn::HttpServer::START_CTX[0] = "#{rails_root}/bin/unicorn" 

before_exec do |server| 
    # Ensure unicorn picks up our newest Gemfile 
    ENV['BUNDLE_GEMFILE'] = "<%= current_path %>/Gemfile" 
end 

# unicorn.cap 
def run_unicorn 
    within current_path do 
    # change execute :unicorn, instead of :unicorn_rails 
    execute :unicorn, "-C#{current_path}/config/unicorn.rb -D -E #{fetch(:rails_env)}" 
    end 
end 

参见：http://unicorn.bogomips.org/Sandbox.html