我有一台服务器,每 1 分钟与厨师一起部署一次。对于重启独角兽,我将 USR2 信号发送给旧主人,然后尝试通过代码减少旧工人:
before_fork do |server, worker|
# the following is highly recomended for Rails + "preload_app true"
# as there's no need for the master process to hold a connection
defined?(ActiveRecord::Base) and
ActiveRecord::Base.connection.disconnect!
# This allows a new master process to incrementally
# phase out the old master process with SIGTTOU to avoid a
# thundering herd when doing a transparent upgrade. The last worker
# spawned will then kill off the old master process with a SIGQUIT.
old_pid = "#{server.config[:pid]}.oldbin"
if old_pid != server.pid
begin
sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
Process.kill(sig, File.read(old_pid).to_i)
rescue Errno::ENOENT, Errno::ESRCH
end
end
# sleep 1
end
最后,向老主人发送 QUIT 信号
每次我在日志中收到以下消息时:
E, [2013-07-03T10:56:19.983813 #19955] ERROR -- : retrying in 0.5 seconds (1 tries left)
E, [2013-07-03T10:56:20.484468 #19955] ERROR -- : adding listener failed addr=0.0.0.0:3000 (in use)
E, [2013-07-03T10:56:20.484595 #19955] ERROR -- : retrying in 0.5 seconds (0 tries left)
E, [2013-07-03T10:56:20.985190 #19955] ERROR -- : adding listener failed addr=0.0.0.0:3000 (in use)
/my_path/766ea02ce174c37de606c1960c498d53c5fb602b/vendor/bundle/ruby/1.9.1/gems/unicorn-4.4.0/lib/unicorn/socket_helper.rb:147:in `initialize': Address already in use - bind(2) (Errno::EADDRINUSE)
这意味着无法启动新主机(我没有在进程列表中看到新主机)但无法关闭旧主机并且工人数量是恒定的。
我可能会以错误的方式做什么?谢谢)