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我刚刚切换到在独角兽上部署我的Rails项目。在我Capistrano的配方deploy:restart
是为什么unicorn.pid被更新,但进程不会重新启动?
task :restart, :except => { :no_release => true } do
run "cd #{shared_path}/pids && kill -s USR2 `cat unicorn.pid`"
end
但是从我不时发现,有时候,部署过程成功完成,不过虽然unicorn.pid更新,麒麟过程保持静止。
例如,我部署在12月15日,并且监测到unicorn.pid
已更新,但是如果我运行ps -ef | grep unicorn
,我可以看到独角兽进程仍在我上次部署时启动,所以它指的是最后一个发布文件夹造成麻烦。
这是为什么?
以下是我的unicorn.rb
文件:
env = ENV["RAILS_ENV"]
case env
when 'pre', 'production'
@app_path = '/home/deployer/deploy/myproject'
end
if env == 'pre' || env == 'production'
user 'deployer', 'staff'
shared_path = "#{@app_path}/shared"
stderr_path "#{shared_path}/log/unicorn.stderr.log"
stdout_path "#{shared_path}/log/unicorn.stdout.log"
if env == 'production'
worker_processes 6
else
worker_processes 2
end
working_directory "#{@app_path}/current" # available in 0.94.0+
listen "/tmp/myproject.sock", :backlog => 64
timeout 30
pid "#{shared_path}/pids/unicorn.pid"
preload_app true
GC.respond_to?(:copy_on_write_friendly=) and
GC.copy_on_write_friendly = true
before_fork do |server, worker|
defined?(ActiveRecord::Base) and
ActiveRecord::Base.connection.disconnect!
old_pid = "#{shared_path}/pids/unicorn.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
# someone else did our job for us
end
end
end
after_fork do |server, worker|
defined?(ActiveRecord::Base) and
ActiveRecord::Base.establish_connection
end
end
感谢Hisoka,所以这样上帝照顾所有人,我仍然得到独角兽pre_load应用程序的好处? – larryzhao
是的,基本上就是这样。 –