unicorn - 为什么 unicorn 在生产模式下启动时会创建多个主进程？

Question

好的，所以我正在尝试使用 unicorn 设置生产服务。

当我尝试通过我编写的脚本启动 unicorn 服务器时，它会启动 2 个主实例。

这只发生在我用给定的“-E 生产”启动它时。

我开始 unicorn 的init scipt:

#!/bin/sh
set -e

TIMEOUT=${TIMEOUT-60}
APP_ROOT=/application/path/current
PID=$APP_ROOT/tmp/pids/unicorn.pid
CMD="/usr/local/rvm/scripts/rvm && cd $APP_ROOT && bundle exec unicorn -D -E production -c $APP_ROOT/config/production/unicorn.rb"
action="$1"
set -u

old_pid="$PID.oldbin"

cd $APP_ROOT || exit 1

sig () {
        test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
        test -s $old_pid && kill -$1 `cat $old_pid`
}

case $action in
start)
        sig 0 && echo >&2 "Already running" && exit 0
        su -s /bin/bash -c "$CMD" - www-data
        ;;
stop)
        sig QUIT && exit 0
        echo >&2 "Not running"
        ;;
force-stop)
        sig TERM && exit 0
        echo >&2 "Not running"
        ;;
restart|reload)
        sig HUP && echo reloaded OK && exit 0
        echo >&2 "Couldn't reload, starting '$CMD' instead"
        su -s /bin/bash -c "$CMD" - www-data
        ;;
upgrade)
        if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
        then
                n=$TIMEOUT
                while test -s $old_pid && test $n -ge 0
                do
                        printf '.' && sleep 1 && n=$(( $n - 1 ))
                done
                echo

                if test $n -lt 0 && test -s $old_pid
                then
                        echo >&2 "$old_pid still exists after $TIMEOUT seconds"
                        exit 1
                fi
                exit 0
        fi
        echo >&2 "Couldn't upgrade, starting '$CMD' instead"
        su -s /bin/bash -c "$CMD" - www-data
        ;;
reopen-logs)
        sig USR1
        ;;
*)
        echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
        exit 1
        ;;
esac

unicorn 配置:

working_directory "/application/path/current"
pid "/application/path/current/tmp/pids/unicorn.pid"
stderr_path "/application/path/current/log/unicorn.log"
stdout_path "/application/path/current/log/unicorn.log"

listen "/application/path/current/tmp/unicorn.application_name.sock"
worker_processes 1
timeout 30

before_fork do |server, worker|
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!

  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
    end
  end
end

真的很感激任何帮助!

编辑:
嗯……如果我写命令“ps aux | grep unicorn”，它看起来很困难，它只说明了 2 个进程(1 个主进程和 1 个工作进程)但是为什么 dos htop 状态我有 5 个进程处于事件状态(2 个主进程和 3 个工作进程) )？

Answer 1

htop分别列出进程的每个线程，而 ps没有。请阅读 this answer更多细节。