无法正确启动 unicorn，出现错误 "already running"

Question

我想使用 capistrano 将 rails 项目部署到 Ubuntu 14.04 服务器，并让它运行使用 unicorn。

我创建了一个这样的 unicorn:start 任务：

namespace :unicorn do
  task :environment do
    set :unicorn_pid, "#{shared_path}/tmp/pids/unicorn.pid"
    set :unicorn_config, "#{current_path}/config/unicorn/#{fetch(:rails_env)}.rb"
  end
  def start_unicorn
    within current_path do
      execute :bundle, :exec, :unicorn, "-c #{fetch(:unicorn_config)} -E #{fetch(:rails_env)} -D"
    end
  end

  desc "Start unicorn server"
  task :start => :environment do
    on roles(:app) do
      start_unicorn
    end
  end
end

这是bundle exec cap production unicorn:start

的结果

DEBUG [525e1e88] Running /usr/bin/env [ -d ~/.rbenv/versions/2.2.3 ] as deployer@us.example.com
DEBUG [525e1e88] Command: [ -d ~/.rbenv/versions/2.2.3 ]
DEBUG [525e1e88] Finished in 0.465 seconds with exit status 0 (successful).
DEBUG [6dc9e26a] Running /usr/bin/env if test ! -d /var/www/us.example.com/current; then echo "Directory does not exist '/var/www/us.example.com/current'" 1>&2; false; fi as deployer@us.example.com
DEBUG [6dc9e26a] Command: if test ! -d /var/www/us.example.com/current; then echo "Directory does not exist '/var/www/us.example.com/current'" 1>&2; false; fi
DEBUG [6dc9e26a] Finished in 0.052 seconds with exit status 0 (successful).
DEBUG [81c26179] Running /usr/bin/env [ -e /var/www/us.example.com/shared/tmp/pids/unicorn.pid ] && kill -0 `cat /var/www/us.example.com/shared/tmp/pids/unicorn.pid` as deployer@us.example.com
DEBUG [81c26179] Command: [ -e /var/www/us.example.com/shared/tmp/pids/unicorn.pid ] && kill -0 `cat /var/www/us.example.com/shared/tmp/pids/unicorn.pid`
DEBUG [81c26179] Finished in 0.053 seconds with exit status 1 (failed).
INFO [a5655cfe] Running RBENV_ROOT=~/.rbenv RBENV_VERSION=2.2.3 ~/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/us.example.com/current/config/unicorn/production.rb -E deployment -D  as deployer@us.example.com
DEBUG [a5655cfe] Command: cd /var/www/us.example.com/current && ( RBENV_ROOT=~/.rbenv RBENV_VERSION=2.2.3 RAILS_ENV=production RBENV_ROOT=~/.rbenv RBENV_VERSION=2.2.3 ~/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/us.example.com/current/config/unicorn/production.rb -E deployment -D  )
INFO [a5655cfe] Finished in 3.770 seconds with exit status 0 (successful).
DEBUG [dd3f31fa] Running /usr/bin/env if test ! -d /var/www/us.example.com/current; then echo "Directory does not exist '/var/www/us.example.com/current'" 1>&2; false; fi as deployer@us.example.com
DEBUG [dd3f31fa] Command: if test ! -d /var/www/us.example.com/current; then echo "Directory does not exist '/var/www/us.example.com/current'" 1>&2; false; fi
DEBUG [dd3f31fa] Finished in 0.055 seconds with exit status 0 (successful).
INFO [1140efb6] Running RBENV_ROOT=~/.rbenv RBENV_VERSION=2.2.3 ~/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/us.example.com/current/config/unicorn/production.rb -E production -D as deployer@us.example.com
DEBUG [1140efb6] Command: cd /var/www/us.example.com/current && ( RBENV_ROOT=~/.rbenv RBENV_VERSION=2.2.3 RBENV_ROOT=~/.rbenv RBENV_VERSION=2.2.3 ~/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/us.example.com/current/config/unicorn/production.rb -E production -D )
DEBUG [1140efb6]    master failed to start, check stderr log for details

并且在日志中显示 pid=': Already running on PID:10760。

Unicorn 本身已执行，但不知何故启动过程运行s 两次，因此第二个运行ning 过程失败。我可以找到它，但我无法找出为什么运行ning 过程运行两次。

我应该检查什么来解决这个问题？

Answer 1

抱歉有点跑题了。您是否尝试使用现有的 3rd 方插件而不是编写自己的 Capistrano 任务？您可以在以下位置找到它们：

http://capistranorb.com/documentation/third-party-plugins/

https://github.com/tablexi/capistrano3-unicorn

无法正确启动 unicorn，出现错误 "already running"

Can't start unicorn properly with error "already running"

ruby-on-rails

unicorn