尝试使用USR2信号重新启动Unicorn时,我遇到了这个特殊问题.在VPS的干净重新启动之后,发送USR2信号给Unicorn并且正常重新启动,我没有任何问题.但是,如果我再尝试一个小时左右,我会留下一位老主人,防止新主人开始.然后我被迫杀死了老师,所以新的主人可以开始.如果我重新启动VPS,它会修复它,但是在一个小时之后,再次出现问题.我在Rails 4,Ruby 2.0.0.

unicorn.log

I,[2014-01-07T15:37:37.118523 #19797]  INFO -- : executing ["/srv/rails/current/bin/unicorn","-c","/srv/rails/current/config/unicorn.rb",{12=>#<Kgio::UNIXServer:fd 12>}] (in /srv/rails/releases/20140107091945)
I,[2014-01-07T15:37:37.118983 #19797]  INFO -- : forked child re-executing...
I,[2014-01-07T15:37:38.998632 #19797]  INFO -- : inherited addr=/srv/rails/shared/sockets/unicorn.sock fd=12
I,[2014-01-07T15:37:38.999038 #19797]  INFO -- : Refreshing Gem list
I,[2014-01-07T15:37:41.927794 #19967]  INFO -- : Refreshing Gem list
/srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:219:in `pid=': Already running on PID:19967 (or pid=/srv/rails/shared/pids/unicorn.pid is stale) (ArgumentError)
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:151:in `start'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/bin/unicorn:126:in `<top (required)>'
        from /srv/rails/current/bin/unicorn:16:in `load'
        from /srv/rails/current/bin/unicorn:16:in `<main>'
/srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:219:in `pid=': Already running on PID:21250 (or pid=/srv/rails/shared/pids/unicorn.pid is stale) (ArgumentError)
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:151:in `start'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/bin/unicorn:126:in `<top (required)>'
        from /srv/rails/current/bin/unicorn:16:in `load'
        from /srv/rails/current/bin/unicorn:16:in `<main>'
E,[2014-01-07T15:40:46.720131 #20878] ERROR -- : reaped #<Process::Status: pid 21075 exit 1> exec()-ed
E,[2014-01-07T15:40:46.720870 #20878] ERROR -- : master loop error: Already running on PID:21250 (or pid=/srv/rails/shared/pids/unicorn.pid is stale) (ArgumentError)
E,[2014-01-07T15:40:46.723525 #20878] ERROR -- : /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:219:in `pid='
E,[2014-01-07T15:40:46.723671 #20878] ERROR -- : /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:413:in `reap_all_workers'
E,[2014-01-07T15:40:46.723747 #20878] ERROR -- : /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:292:in `join'
E,[2014-01-07T15:40:46.723815 #20878] ERROR -- : /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/bin/unicorn:126:in `<top (required)>'
E,[2014-01-07T15:40:46.723880 #20878] ERROR -- : /srv/rails/current/bin/unicorn:16:in `load'
E,[2014-01-07T15:40:46.723930 #20878] ERROR -- : /srv/rails/current/bin/unicorn:16:in `<main>'
E,[2014-01-07T15:41:13.704700 #21250] ERROR -- : adding listener Failed addr=/srv/rails/shared/sockets/unicorn.sock (in use)
E,[2014-01-07T15:41:13.704901 #21250] ERROR -- : retrying in 0.5 seconds (4 tries left)
E,[2014-01-07T15:41:14.205452 #21250] ERROR -- : adding listener Failed addr=/srv/rails/shared/sockets/unicorn.sock (in use)
E,[2014-01-07T15:41:14.205597 #21250] ERROR -- : retrying in 0.5 seconds (3 tries left)
78.40.124.16,173.245.49.122 - - [07/Jan/2014 15:41:14] "GET / HTTP/1.0" 200 28697 0.8345
E,[2014-01-07T15:41:14.706179 #21250] ERROR -- : adding listener Failed addr=/srv/rails/shared/sockets/unicorn.sock (in use)
E,[2014-01-07T15:41:14.706335 #21250] ERROR -- : retrying in 0.5 seconds (2 tries left)
E,[2014-01-07T15:41:15.206834 #21250] ERROR -- : adding listener Failed addr=/srv/rails/shared/sockets/unicorn.sock (in use)
E,[2014-01-07T15:41:15.206987 #21250] ERROR -- : retrying in 0.5 seconds (1 tries left)
E,[2014-01-07T15:41:15.707431 #21250] ERROR -- : adding listener Failed addr=/srv/rails/shared/sockets/unicorn.sock (in use)
E,[2014-01-07T15:41:15.707563 #21250] ERROR -- : retrying in 0.5 seconds (0 tries left)
78.40.124.16,149.154.158.74 - - [07/Jan/2014 15:41:15] "GET / HTTP/1.0" 200 32866 0.4528
E,[2014-01-07T15:41:16.208055 #21250] ERROR -- : adding listener Failed addr=/srv/rails/shared/sockets/unicorn.sock (in use)
/srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/socket_helper.rb:158:in `initialize': Address already in use - "/srv/rails/shared/sockets/unicorn.sock" (Errno::EADDRINUSE)
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/socket_helper.rb:158:in `new'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/socket_helper.rb:158:in `bind_listen'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:255:in `listen'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:801:in `block in bind_new_listeners!'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:801:in `each'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:801:in `bind_new_listeners!'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:146:in `start'
        from /srv/rails/shared/bundle/ruby/2.0.0/gems/unicorn-4.7.0/bin/unicorn:126:in `<top (required)>'
        from /srv/rails/current/bin/unicorn:16:in `load'
        from /srv/rails/current/bin/unicorn:16:in `<main>'

unicorn.rb

deploy_path = "/srv/rails"
RAILS_ENV = ENV['RAILS_ENV'] || "production"

working_directory "#{deploy_path}/current"
pid "#{deploy_path}/shared/pids/unicorn.pid"
stderr_path "#{deploy_path}/shared/log/unicorn.log"

# Listen on a UNIX data socket
listen "#{deploy_path}/shared/sockets/unicorn.sock"
worker_processes 4

# Preload application before forking worker processes
preload_app true

# Restart any workers that haven't responded in 30 seconds
timeout 30

before_fork do |server,worker|
  ##
  # When sent a USR2,Unicorn will suffix its pidfile with .oldbin and
  # immediately start loading up a new version of itself (loaded with a new
  # version of our app). When this new Unicorn is completely loaded
  # it will begin spawning workers. The first worker spawned will check to
  # see if an .oldbin pidfile exists. If so,this means we've just booted up
  # a new Unicorn and need to tell the old one that it can now die. To do so
  # we send it a QUIT.
  #
  # Using this method we get 0 downtime deploys.

  old_pid = "#{server.config[:pid]}.oldbin"

  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT",File.read(old_pid).to_i)
    rescue Errno::ENOENT,Errno::ESRCH => e
      log = File.open(Rails.root.join('log/unicorn.log'),"a")
      log.puts "Error encountered when killing process:\n"
      log.puts "#{e.message}"
      log.close
    end
  end

  # the following is recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
  end
end

after_fork do |server,worker|
  ##
  # Unicorn master loads the app then forks off workers - because of the way
  # Unix forking works,we need to make sure we aren't using any of the parent's
  # sockets,e.g. db connection

  ActiveRecord::Base.establish_connection
  # Redis and Memcached would go here but their connections are established
  # on demand,so the master never opens a socket

  ##
  # Unicorn master is started as root,which is fine,but let's
  # drop the workers to deployer
  begin
    uid,gid = Process.euid,Process.egid
    user,group = 'deployer','deployer'
    target_uid = Etc.getpwnam(user).uid
    target_gid = Etc.getgrnam(group).gid
    worker.tmp.chown(target_uid,target_gid)
    if uid != target_uid || gid != target_gid
      Process.initgroups(user,target_gid)
      Process::GID.change_privilege(target_gid)
      Process::UID.change_privilege(target_uid)
    end
  rescue => e
    if RAILS_ENV == 'development'
      STDERR.puts "couldn't change user,oh well"
    else
      raise e
    end
  end
end

deploy.rb

require 'bundler/capistrano'    # runs a bundle install --deployment

# https://github.com/sstephenson/rbenv/issues/101
set :keep_releases,10
set :shared_children,shared_children + %w(public/images public/uploads)

# Multistage extension
set :stages,["production","staging"]
set :default_stage,"staging"
require 'capistrano/ext/multistage'
require 'underglow/capistrano'

# Whenever crontab updates
set :whenever_environment,defer { stage }
set :whenever_command,"bin/whenever"
require 'whenever/capistrano'

set :application,"rails"
set :user,"deployer"

default_run_options[:pty] = true
default_run_options[:shell] = '/bin/zsh'
set :use_sudo,false

# repository
set :repository,"XXXXXXXXXXXXXXXXX"
set :branch,fetch(:branch,"master")  # can specify a branch from `cap -S branch="<branch_name>"`
set :scm,:git
set :scm_verbose,true

set :ssh_options,forward_agent: true

set :deploy_to,"/srv/rails"
set :deploy_via,:remote_cache

# We're using a rbenv user install,setup the PATH we need to access the rbenv shims
set :default_environment,{
  'PATH' => "$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH"
}

有没有人看到这个？