rails s -p 16052 -d
ruby script/server -p 16050 -d
启动守护进程后，当前路径变为 根路径/ ，所有相对路径的写法就会有问题(Dir.pwd变为 /)
在 puma.rb里 设置 daemonize true ，当前路径还是 项目路径
image.png
The Puma 5.0 release removed daemonization. For older versions and alternatives, continue reading.
https://blog.csdn.net/xingchao_1995/article/details/60151552
puts 'parent'
puts "pid:#{Process.pid}"
exit if fork
puts "fork1,pid:#{Process.pid}"
Process.setsid
puts "setsid,pid:#{Process.pid}"
exit if fork
puts "fork2,pid:#{Process.pid}"
puts "now_dir:#{Dir.pwd}"
Process.daemon
File.open("/Users/rcc/Desktop/process.txt",'wb'){|f| f.puts("pid:#{Process.pid}")}
File.open("/Users/rcc/Desktop/process.txt",'a+'){|f| f.puts(Dir.pwd)}
while true
File.open("/Users/rcc/Desktop/process.txt",'a+'){|f| f.puts(Time.now.to_i)}
sleep(1)
end
